News

Fiber optic sensors have a very wide range of applications in the industrial field, mainly because fiber optic sensors have the advantages of extremely high sensitivity and accuracy, anti-electromagnetic interference, high insulation strength, corrosion resistance, inherent good safety, integrated sensing and transmission, and compatible with digital communication systems. They are summarized as follows. 1. very high sensitivity. 2. light, thin and flexible for easy installation and burial. 3. electrical insulation and chemical stability, the fiber itself is a highly insulating, chemically stable material, suitable for power systems and chemical systems need high voltage isolation and flammable and explosive and other harsh environments. 4. good safety, fiber optic sensors are electrically passive sensitive components, so when applied to the measurement, there is no leakage and electric shock and other safety hazards;. 5. anti-electromagnetic interference, in general, the frequency of light waves than the frequency of electromagnetic radiation, so light propagation in the fiber will not be affected by electromagnetic noise. 6. Distributed measurement, an optical fiber can achieve long distance continuous measurement and control, can accurately measure the strain, damage, vibration and temperature information at any point, and thus form a monitoring area with a large range, to improve the level of environmental detection. 7. long service life, the main material of the optical fiber is quartz glass, wrapped in a polymer cladding, which makes it have greater durability compared to metal sensors. 8. Large transmission capacity, fiber optic as the bus, with the transmission of large-capacity optical fiber instead of bulky multi-core underwater cable to collect and store the information of each sensing point, and through multiplexing technology, to achieve the monitoring of distributed fiber optic sensors.

Proximity sensors are widely used in the industrial field, especially in the automotive field, but there are very many types of sensors, and there are many models, and the quality is also uneven, the following proximity sensors how to wiring:. 1. Proximity sensors have two-wire system and three-wire system of the difference, three-wire proximity sensors are divided into NPN type and PNP type, their wiring is different. 2. Two-wire proximity sensor wiring is relatively simple, the proximity sensor and the load in series to the power supply can be. 3. Three-wire proximity sensor wiring: red wire to the positive side of the power supply; blue wire to the 0V side of the power supply; yellow wire for the signal, should be connected to the load. The other end of the load is connected in this way: for the NPN type proximity sensor, should be connected to the positive side of the power supply; for the PNP type proximity sensor, should be connected to the 0V side of the power supply. 4. The load of the proximity sensor can be a signal lamp, a relay coil or a digital input module of a programmable controller PLC. 5. need to pay special attention to the PLC digital input module to the three-wire proximity sensor type selection. the PLC digital input module can generally be divided into two categories: a class of common input for the power supply 0V, the current from the input module out, at this time, must choose NPN type proximity sensor; the other class of common input for the positive side of the power supply, the current flow into the input module, that is, the trap input, at this time, must be Select PNP type proximity sensor. Do not choose the wrong one. 6. Two-wire proximity sensors subject to the constraints of the working conditions, the switch itself produces a certain voltage drop when on, and a certain residual current flow through the cutoff, the choice should be considered. Three-wire proximity sensor, although an additional line, but not the residual current and other adverse factors, the work is more reliable. 7. Some manufacturers will be close to the sensor "normally open" and "normally closed" signal at the same time, or to increase other functions, such cases, please follow the product specification specific wiring 220v proximity sensor wiring proximity sensor wiring so connected: two-wire proximity sensor Is a rated voltage to set your control voltage, that is, for example, your proximity sensor is 220 volts, then you control the relay's suction coil must be 220 volts, and the control power supply voltage must also be 220 volts. Then use the proximity sensor and the relay coil in series will be fine.

Proximity switches are widely used in our production life, and they are very versatile. Today, we are going to introduce one of them - capacitive proximity switch. First. Capacitive Proximity Switches Capacitive proximity switch This type of switch measurement usually constitutes one pole of a capacitor, while the other pole is the housing of the switch. This housing is usually grounded or connected to the housing of the device during the measurement. When an object moves towards the proximity switch, regardless of whether it is a conductor or not, its proximity always causes a change in the dielectric constant of the capacitor and thus a change in the capacitance, which causes a change in the state of the circuit connected to the measuring head, thereby controlling the switch to turn on or off. The objects detected by this type of proximity switch are not limited to conductors, but can be insulated liquids or powders, etc. Second. Capacitive proximity switch function The sensing surface of a capacitive sensor consists of two concentrically arranged metal electrodes, which are equivalent to the electrodes of a non-wire-wound capacitor. The surfaces a and b of the electrodes are connected to the feedback branch of a high frequency oscillator, which is adjusted so that it does not oscillate when the surface is free. When an object approaches the effective surface of the sensor, it enters the electric field in front of the electrode surface and causes a change in the coupling capacitance. The oscillator starts to oscillate and the amplitude of the oscillation is recorded by an evaluation circuit and is converted into a switching command. Capacitive proximity switches, mainly for detecting non-metallic substances. Third. Matters to be noted when using capacitive proximity switches 1. The capacitive proximity switch has a 50ms turn-on time, so in the design of the user's product, when the load and the proximity switch use different power supplies, be sure to turn on the power of the proximity switch first. 2. Capacitive proximity switches can theoretically detect any object, but when detecting objects with high dielectric constants, the detection distance is significantly reduced, at which point even increasing the sensitivity will not be effective. 3. When using inductive loads (such as lamps, motors, etc.), their transient inrush currents are large and may deteriorate or damage the AC 2-wire capacitive proximity switch, in which case, please go through the AC relay as a load to convert the use. 4. Do not place the proximity switch in a DC magnetic field environment of 200 Gauss or more to avoid false operation. 5. DC 2-wire proximity switches have a static leakage current of 0.5-1mA. Use DC 3-wire proximity switches as much as possible in cases where the leakage current of DC 2-wire proximity switches is required to be high. 6. In order to make the capacitive proximity switch work stably for a long time, please make sure to carry out regular maintenance, including whether there is any movement or looseness in the installation position of the detection object and the proximity switch, whether there is poor contact in the wiring and connection parts, and whether there is any dust adherence, as it is more affected by humidity and dust. 7. Avoid using the proximity switch in chemical solvents, especially in strong acid and alkali environments. The above is a detailed description of capacitive proximity switches. Capacitive proximity switches, in practical applications, are mainly used to detect non-metallic substances.

With the continuous development of the Internet of things, artificial intelligence, industrial Internet, big data and other industries, the sensor industry has also become an important industry sector in the development of high-tech. Sensors are the key basic devices for information data collection in the field of intelligent manufacturing, and in fact, sensors have become an important foundation for the future era of intelligence. In the era of industrial Internet and intelligent manufacturing, the development of industry is inseparable from the support of many perception technologies, one of the key technologies is the sensor. In other words, industrial sensors allow automated intelligent devices to have the ability to sense. According to statistics, there are more than 30,000 types of sensors in the world, and they are constantly increasing. Common types of sensors include: temperature sensors, humidity sensors, pressure sensors, displacement sensors, flow sensors, liquid level sensors, force sensors, acceleration sensors, torque sensors, etc. At present, sensors are widely used in various fields of social development and human life, such as industrial automation, modern agriculture, aerospace technology, military engineering, robotics, resource development, marine exploration, environmental monitoring, safety and security, medical diagnosis, transportation, household appliances, etc. In recent years, China's sensor market has developed rapidly, and the country's attention to the industry has been increasing. According to the market size of China's sensor industry by Sadie Consultant, 2016-2019, China's intelligent sensor industry market size CAGR of about 16.4%, with China's 3C electronics, new energy vehicles and other areas of increasingly robust demand for sensors and the rapid development of the future downstream market, the Foresight Industry Research Institute expects the next five years sensor manufacturing industry CAGR will reach 19%. The market size of China's sensor industry is expected to reach 708.2 billion yuan in 2026. In fact, China's sensor industry in general started late, weak innovation capacity, core technology is subject to others, the development of high-end sensors lag behind foreign markets. But now the rapid development of domestic information automation, sensor market demand for high-speed growth, while the country will be the sensor technology as a key breakthrough area. Now it is the key link in the transition from traditional to new sensors, the localized sensor market is ushering in a new stage of development. Domestic sensor companies are continuously seeking breakthroughs, constantly optimizing technology and promoting market-oriented applications. China's sensor market in recent years to maintain the overall growth trend, in some areas of technology has been no less than the international brands, and in the market services have local advantages, so the sensor localization rate is also increasing. The future with the development of the use of the Internet of things and the expansion of sensor applications, to a certain extent will attract more companies to the sensor industry. And in the future, as domestic sensor companies continue to iterate technology, product line further enrichment, market awareness continues to improve the localization rate of the industrial sensor market will continue to improve. Therefore, the primary goal of China's industrial sensors is to achieve the localization of core components, which requires the combined efforts of colleagues in the sensor industry to do. At present, many domestic sensor companies are committed to improving the level of automation technology and innovation capabilities, optimize the technical and technological details. And Shenzhen Shenwu Sensor Co., Ltd. is one of them. Shenzhen Shenwu Sensor Co., Ltd. was established in 2003, is a sensor solutions provider and sensor design solutions manufacturer, is one of the domestic recognized process and industrial automation field, Shenzhen high-tech enterprises, preferred brands. Suenw focus on photoelectric and inductive technology, relying on years of technology accumulation and R & D manufacturing advantages, drawing on industry experience, and a number of domestic and foreign universities and laboratories to establish joint technical research and development cooperation, by the team of more than 20 years of experience through the technical advantages of Shenmu sensors to solve a variety of challenging problems and achieve automation goals. Suenw always puts customers' needs first and insists on factory self-management. Its safety grating, photoelectric switch, proximity switch, fiber optic sensor and other series of products adopt the industry's design solutions, and the products have passed the EU CE certification; moreover, there are many skilled application engineers distributed in factory sites all over the country to help customers solve product problems and save production costs, and are committed to providing support for customers to become industry players. After years of development and accumulation, now the products are widely used in module limit, SMT assembly, gate access, lithium new energy, medical equipment, storage shelves, food machinery, printing and packaging, CNC machine tools and other industries. At present, we have set up branches in Shenzhen, Dongguan, Guangzhou, Suzhou, Shanghai, etc., and will form an institutional system and business network radiating to all major regions of the country. Carefully built intelligent products, customized solutions and considerate services are the keys to attract our customers. Each of these successes has helped us to enhance our technical capabilities and manufacturing capacity, increase our staff and industry knowledge, foster relationships with customers and partners, and expand our reach both domestically and globally. In the future, we will also continue to accelerate our R&D and update our technology to contribute to the promotion of the localization of industrial sensors. Sensor industry as a high-tech industry, in the face of the development of domestic and international markets, is bound to face many difficulties and challenges, and the future in the market, technology, policy and other support, I believe that the domestic sensor industry will usher in vigorous development.

Fiber optic sensors and photoelectric sensors as two typical sensors, the production of measurement in its application are more widespread, so what is the difference between the two? Fiber optic sensor technology is built on the basis of optical fiber, optical communications and optoelectronics technology developed, electromagnetic interference and corrosion effects on it is very small, it can adapt to a variety of harsh weather conditions, without additional power supply for power supply, it can be long-distance transmission, is the current sensor industry research hotspots. 1. Principle Photoelectric Sensor: It is a sensor that uses a photoelectric element as a detection element. It first converts the measured change into a change in the optical signal, and then further converts the optical signal into an electrical signal with the help of a photoelectric element. Photoelectric sensor is generally composed of three parts: light source, optical path and photoelectric element. Fiber Optic Sensor: is the light from the light source through the optical fiber into the modulator, so that the parameters to be measured and the light into the modulation area after the interaction, resulting in the optical properties of light (such as light intensity, wavelength, frequency, phase, bias state, etc.) change, known as the modulated signal light, in the optical fiber sent to the optical detector, after demodulation, to obtain the measured parameters. 2. Applications 1). Application areas of photoelectric sensors: Soot turbidity monitor to prevent industrial soot pollution is one of the important tasks of environmental protection. In order to eliminate industrial soot pollution, we must first know the soot emissions, so the soot source must be monitored, automatically displayed and exceeded alarm. The turbidity of the soot in the flue is detected using the size of the change through the light during its transmission in the flue. If the turbidity of the flue increases, the light from the light source is absorbed and refracted by the soot particles, and the light reaching the photodetector decreases, so the strength of the output signal of the photodetector reflects the change of the turbidity of the flue. Photocells in photoelectric detection and automatic control applications; photocells used as photoelectric detection, the basic principle is the same as the photodiode, but their basic structure and manufacturing process is not exactly the same. As the photoelectric cell work without applied voltage; photoelectric conversion efficiency, wide spectral range, good frequency characteristics, low noise, etc., it has been widely used in photoelectric readout, photoelectric coupling, grating ranging, laser collimation, film also sound, ultraviolet monitor and gas turbine flameout protection devices. 2) Fiber optic sensor application areas: insulator fouling, magnetic, acoustic, pressure, temperature, acceleration, gyroscope, displacement, liquid level, torque, light and sound, current and strain and other physical quantities measurement.

There are many different types of sensors, and there is a component proximity sensor that has the ability to "sense" the proximity of an object close to it - the proximity sensor. Proximity sensors are used for the purpose of controlling the switch on or off by using the sensitive characteristics of the proximity sensor to the approaching object. When an object moves towards the proximity sensor and approaches to a certain distance, the proximity sensor will have "sense" and the switch will act. This distance is usually called the "detection distance". However, different proximity sensors have different detection distances. Sometimes the detected objects are moved to the proximity sensor one by one and left one by one at certain time intervals, and this is repeated over and over again. Different proximity sensors have different response capabilities to the detected objects. Proximity sensor, also known as a contactless position switch, is a position switch that can be operated without mechanical contact with moving parts. When a moving object is close to the switch to a certain position, the switch sends a signal to achieve the role of travel control, counting and automatic control. Compared with travel switches, proximity sensors have the advantages of high positioning accuracy, reliable operation, long life, high operating frequency and the ability to adapt to harsh working environments. However, the proximity sensor requires a contact relay as the output when used. Detailed characteristics are as follows. 1. Dynamic characteristics of proximity sensors The so-called dynamic characteristics of the proximity sensor is the switch near the output characteristics when the input changes. In practice, some dynamic characteristics of the commonly used standard input signal are switched to show the echo. This is due to the proximity sensor to the standard input signal echo to test the way to obtain and near the switch specification of the input echo signal and the inevitable link between the arbitrary input signal echo, usually knowing that the former can presume the latter. Step signals and sine signals are most commonly used and input signal specifications, so the dynamic characteristics of the near switch are also commonly displayed by step echoes and frequency echoes. 2. Sensitivity of proximity sensors The sensitivity of the proximity switch to changes in the output of steady-state operation, the rate of change of the input. It is the slope of the output of the input characteristic curve. If there is a significant linear relationship between the input and output of the proximity sensor, the proximity sensor is of a constant sensitivity. Otherwise, the sensitivity of the switch varies with the input. The size sensitivity of the switch is the size output, the rate of the input. For example, a proximity sensor, in the proximity change of 1 mm, 200mV sensitivity and the output voltage change is proximity sensor should be labeled as 200mV/mm. When the output switch is close to the size of the input phase, the sensitivity of the proximity sensor can be interpreted as the expansion ratio. The sensitivity to the switch, a higher measurement accuracy can be obtained. However, the sensitivity of the proximity sensor is high, the measurement range is narrow, and the stability is poor. 3. Switching resolution The resolution of the switch is what the switch can feel is measured to the smallest change. That is, if the input from a non-zero value to change slowly. When changing the input value near the switch does not exceed a certain value, the output of the proximity sensor does not change, i.e., near the switch which is not out of the resolution of the change in the input quantity. Only when the change of the input to the switch exceeds the resolution, the output will change. 4. Linearity of proximity sensors Usually, the output of the switch is close to the static characteristic curve, rather than a straight line in practice. In practice, in order to make the appearance of uniform scale readings near the switch, usually a fitted straight line approximates the practice characteristic curve represented by the linear error (linearity) is the degree of approximation of the performance index. There are various ways to choose the straight line fitting straight line. If the proximity sensor input zero and full scale output is connected to the theoretical straight line fitting straight line; or the characteristic curve of the error squared and the minimum theoretical straight line fitting straight line, fitting straight line indicates a linear least squares fit. 5. Switching static characteristics In the static characteristics of the switch is a static input signal, close to the switch output and input is interconnected. Thereafter the proximity sensor input and output quantities and time independent, so link between them, that is, the proximity sensor static characteristics can be used without the time variable algebraic system of equations, or input variables as the horizontal coordinate, the corresponding output of the proximity sensor as the vertical coordinate, drawing the characteristic curve to describe.

At present, China is in an important development stage of industrial industrial structure upgrading, the future of industrial manufacturing will gradually to high-end development, which makes sensors and other automation-related products usher in good development opportunities. Photoelectric sensors as the most basic and most widely used sensors, but also ushered in a glorious future. A photoelectric sensor is a device that converts an optical signal into an electrical signal. Its working principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light is shone on certain substances, the electrons of the substance absorb the energy of the photons and a corresponding electrical effect occurs. Principle of operation Photoelectric sensors are generally composed of two parts: the processing path and the processing element. The basic principle is based on the photoelectric effect, which converts the measured change into a change in the optical signal, and then further converts the non-electrical signal into an electrical signal with the help of the photoelectric element. Product characteristics The photoelectric sensor uses a photoelectric element as the detection element, which first transforms the change in the light signal of the measured object into a change in the electrical signal, and then further converts the light signal into an electrical signal with the aid of the photoelectric element. Photoelectric sensors generally consist of a light source, an optical path and a photoelectric element. In order to meet the market demand for small and high performance photoelectric sensors, integrated IC chips are used in the optical path circuit instead of the original complex circuit, which can greatly reduce some of the faults encountered in the work of photoelectric sensors. The use of integrated IC chips is far less complex than commercially available sensors with complex circuitry. It reduces a lot of unnecessary trouble for the manufacturer's machine operation.

Many people feedback in the actual application of the factory many people can not tell the difference between limit switches, photoelectric switches and proximity switches, today I give you a popularization. First of all, limit switches, proximity switches and photoelectric switches are three different principles of sensors, but the role of the same, are used to detect the position. Limit switches: can also be called travel switches; can be installed on relatively static objects (such as fixed frames, door frames, etc., referred to as static objects) or objects in motion (such as moving cars, doors, etc.). When the object is close to the static object, the linkage of the switch drives the contact of the switch causing a closed contact to break or an open contact to close. The change in the open and closed state of the switch contact controls the action of the circuit and mechanism. Limit switches can also be divided into rotary limit switches and in-line limit switches. Limit switches have mainly mechanical contacts inside, which can be either normally open or normally closed. The contact is passive, so there is no distinction between NPN and PNP, the incoming line is 24V and the outgoing line is also 24V; therefore it is not picky about PLC. Proximity switch: A sensor that detects position without direct mechanical contact with moving parts and can be operated. Proximity switches are also known as non-contact travel switches, which can perform travel control and limit protection, etc. The sensor does not require contact with the detecting material, but the material of the detecting material needs to be metal, because it does not require contact with the detection, so it is characterised by reliable operation, long life, low power consumption, high repositioning accuracy, high operating frequency and adaptability to harsh working environments. Proximity switches are divided into PNP and NPN, so when choosing a sensor you need to confirm the PLC connection. Photoelectric switch; it is used to detect the presence or absence of an object by using the detected object to block or reflect the light beam, which is connected to the circuit by the synchronous circuit. Objects are not limited to metal, but all objects that reflect light (or have an obscuring effect on light) can be detected. There are diffuse reflective switches, counter-switches, etc. Diffuse reflective switches require only one sensor to transmit and receive, whereas counter-switches require two sensors, one to transmit and one to receive. Photoelectric switches are also available in NPN and PNP versions, but in addition to this photoelectric switches are also available in dry junction, which can be connected to any kind of PLC. Let's look at the differences between them; First, shape Limit switches generally consist of an obvious action part, and the part can move back and forth with different angles of movement, some can be 180 degrees, some can only be 90 degrees. Proximity switches are simpler and are simply a separate sensor. Some photoelectric switches have the same shape as proximity switches, but some are completely different and need to have both transmitting and receiving components. Second, detection distance Limit switches require direct contact with the detecting substance. Proximity switches are closer and generally have a detection range of typically 3-20mm, depending on the sensor. The detection distance of a proximity switch is largely related to the diameter of the detection head, i.e. the greater the detection distance, the greater the diameter required. The detection distance of photoelectric switches is generally very long, some even reaching several metres. This is a distinctly superior feature to proximity switches, but the principle of photoelectric switches and light, then it has an obvious flaw, that is, vulnerable to vapour dust and other influences, once the vapour dust will detect the route blocked, the sensor will fail, while the proximity switch detection of metal does not have this problem. Third, functions and application occasions 1. limit switch for the mechanical switch, the trial is not very use frequency is not very frequent occasions, in addition, some mechanical switches can be made of all metal, you can work in high temperature occasions, which other sensors can not do. 2. proximity switch life is longer, suitable for "through the signal". The position detection on the cylinder is generally a proximity switch. But because the proximity switch also has an internal circuit, so can not be applied in the strong magnetic interference place. 3. photoelectric switch is the most widely used, only need objects to block the light source can be triggered, so can not be used in dusty places and strong magnetic interference.

Sensors are widely used in modern industrial automation. There are many sensors used in the machine building industry for measuring variables in various production processes. First, temperature and humidity sensors Temperature and humidity sensors compared to other sensors, this is the most familiar to the public sensor. In addition to the industrial sector, they are also widely used in agriculture, chemicals, civil engineering, research and aerospace. Humidity and temperature are important environmental factors that affect many areas of industry. Many high-precision mechanical processes or calibration measurements have high requirements for temperature and humidity, and unsuitable temperatures and humidity can affect the precision performance of products. The requirements for temperature and humidity sensors in the industrial sector are also generally high, which has led to the birth of industrial grade temperature and humidity sensors. Industrial temperature and humidity sensors are more accurate and controlled than ordinary temperature and humidity sensors. A variety of temperature and humidity transmitters can be combined and connected with other environmental monitoring systems to achieve automated remote monitoring and control. In addition to transmitters, more temperature and humidity Internet of Things monitoring system to help large factories, machinery processing, warehouses to achieve the whole temperature and humidity data monitoring, automatically upload the cloud platform, with online, storage, statistics, alarm, analysis reports and data remote transmission and other functions. Second, photoelectric sensor Photoelectric sensor is a device that converts light signals into electrical signals. It can be used to measure light intensity, light illumination, radiation temperature measurement, gas composition analysis, etc. Third, the pressure sensor Pressure sensor is in addition to temperature and humidity sensor another commonly used sensor, it can feel the pressure signal, and in accordance with certain laws will be able to convert the pressure signal into the available output of the electrical signal device or device. It is widely used in various mechanical industrial production automation, aerospace, petrochemical, electric power and other industries. Sensors have long penetrated into industry, agriculture, aerospace, heavy industry, chemical industry, civil engineering, water and electricity, scientific research, electronics and other extremely wide range of fields. Sensors are not only limited to these types, but also such as convergence sensors, position sensors, inductive sensors, vacuum sensors, flow sensors, etc. are widely used in the industrial environment.

According to the different operating principles, it can be divided into inductive, capacitive, photoelectric and magnetic inductive types. If the type of circuit current is followed, it can be divided into AC type and DC type. The inductive head of an inductive proximity switch is an inductive coil with a ferrite core, which can only detect metal bodies. The oscillator generates an alternating magnetic field on the surface of the inductor head, and when a metal object approaches the inductor head, the internal action of the proximity switch is activated, thus achieving "on" and "off" control. Magnetic Proximity Switches The magnetic proximity switch mainly refers to the Hall proximity switch, which works on the Hall effect. When a magnetic object approaches the Hall switch, the state of the Hall proximity switch changes, such as from "on" to "off". Capacitive Proximity Switch The sensing head of a capacitive proximity switch is a circular flat electrode that forms a distributed capacitance with the ground of the oscillation circuit. When a conductor or other medium approaches the sensing head, the electric capacity increases and the oscillator stops oscillating and outputs an electric signal through a shaping amplifier. Capacitive proximity switches can inspect metals, non-metals and liquids. Contactless travel switches, also known as proximity switches, send an "action" signal when an object is approached at a certain distance, without applying mechanical force. The use of proximity switches has gone far beyond the general travel and limit protection of travel switches. They can also be used for high-speed counting, speed measurement, liquid level control, detecting the presence of metal bodies, detecting the size of parts, contactless buttons and as sensors for computers or programmable controllers. Basic operation of an inductive proximity switch sensor Induction proximity switch sensor can be detected from the horizontal side of the sensor body of the proximity measurement, and the sensor head can be detected from the vertical access of the body under test. The working distance of the measured body of the proximity sensor switch sensor operating distance; independent operation of the temperature and voltage of the floating body effect from the actual working vertical distance. The operating delay time, the response time will be called when the test body comes into or out of the detection range. In sensor applications, the results of detecting these parameters should be considered whether the actual situation will be affected. Proximity switches are classified according to their operating principles: high-frequency oscillation type (detecting various metals), permanent magnet type and magnetic sensing element type, electromagnetic induction type, capacitive type, photoelectric type and super-generated wave type, and several others. The commonly used proximity switch is the high-frequency oscillation type, which consists of oscillation, detection, thyristor and other parts. Working Principle of Induction Proximity Switch Sensor A proximity switch sensor is a device that senses the proximity of an object. It uses the sensitivity of the displacement sensor to the object it is approaching for the purpose of identifying the object's proximity and outputting a switching signal. Therefore, proximity switch sensors are often referred to as proximity switches.

Photoelectric switch to light source as a medium, the application of photoelectric effect, when the light source by the object obscured or reflections, radiation and shading caused by the amount of light change to detect the presence or absence of objects, size and light and dark, and to produce contact and no contact output signal of the switching element. Photoelectric switch includes several types, itself does not have a light source, the use of the object to be detected by the amount of change in the amount of light emitted; the use of natural light on the photoelectric switch irradiation, objects shading natural light generated off the amount of change; photoelectric switch itself has a light source, the light source emitted on the object to be detected by the amount of change in the reflected, absorbed, and transmitted light for detection. Commonly used light source for ultraviolet light, visible light, infrared light and other wavelengths of light sources, the type of light source are bulbs, LEDs, laser tubes, etc.; output signal has a switch or analog and communication data information, etc. Photoelectric switch features. 1.Long detection distance: Compared with inductive proximity switches, a long detection distance can be obtained, for example: the detection distance of the opposite type switch can reach tens of meters, reflection has been from a few centimeters to a few meters, because of non-contact detection, so it does not damage the object to be measured, and is not affected by it. 2.the detection object is wide: because it is based on the reflection of the detection object and the transmission of light detection, so regardless of metal, even glass, rubber, wood, liquid, gas, etc. can almost all be detected. 3.fast response time: the detection medium itself is high-speed, because it contains almost no mechanical action, and thus can obtain a very high detection speed. 4. high resolution: because light is propagated in a straight line and has a short wavelength, thus high resolution, suitable for tiny objects and high-precision position detection. 5.Easy to obtain a regular detection area: the use of optical systems such as lenses, can be relatively easy to focus, diffusion and refraction, corresponding to different detection objects and different use of the environment, can be properly selected with a certain detection area of the product. 6.not affected by magnetic fields and vibration: detection switches are generally installed more often in places with strong magnetic fields and vibration, in essence, photoelectric switches are rarely affected by them, and thus can act reliably. 7.Use the characteristics of light detection: can do the color scale, shape characteristics of the selection of detection. 8.long life: because it is non-contact detection, so long life, especially with light-emitting diodes as the light source, control output using no contact way, the life is longer. However, photoelectric switch also has some disadvantages as follows. 9. the lens is susceptible to dust and oil pollution, once the lens is dirty, not only make the light beam scattered, and blocked part of the light, so in harsh environments, must take practical protection measures. 10. the surrounding light intensity on the impact of the switch, for the usual lighting, the current photoelectric switch is almost unaffected, but if the background light is too strong so that more than tens of thousands of lux, it will cause the switch misoperation and cause losses. 11.The cost is higher than other detection switches. The above is the photoelectric switch characteristics shared by me, I hope this article is helpful to you, want to know more photoelectric switch related information, can continue to pay attention to this site!

CNC machine tools are rapidly gaining popularity in enterprises due to their high precision, speed and reliability in manufacturing technology and equipment renewal. A CNC machine tool is an automatic machine tool equipped with a programmed control system, which, according to the program that has been programmed, allows the machine tool to move and process parts. It combines mechanical, automation, computer, measurement, microelectronics and other new technologies, using a variety of proximity sensors. The basic requirements of the CNC machine tool proximity sensor 1. The sensor is highly resistant to interference and highly reliable. 2. the sensor should meet the standards and requirements of speed and accuracy 3. The sensor is more convenient to use and maintain. 4. The cost of the sensor is very low. Different types of CNC machine tools on the sensor some requirements also differ, usually, high-precision, medium-sized CNC machine tools on the sensor requirements are mainly reflected in the accuracy, while large CNC machine tools on the sensor requirements are mainly reflected in the speed response.

Photoelectric switch housing has plastic or metal housing, cylindrical, square, fork, glass or plastic fiber optic, etc. Direct-light system detection distance is long, suitable for large 100m, detecting opaque objects accurately and reliably, good resistance to harsh conditions (dust, scattered light guide) Reflection system detection distance is medium, suitable for large 15m, easy to install, detecting opaque objects or non-reflective transparent objects; polar reflection system can detect Reflective objects diffuse system detection distance. Optical switch installation precautions are as follows: 1.Please follow the wiring method in the operation manual for cable renewal, this product is not suitable for solutions or viscous liquids containing adhesive suspensions, this product may not operate properly in some emulsions and semi-solid liquids. 2.Installation and use, please do not scratch the probe, SD22 probe and the body of the manual turning torque of about 10 kgf-cm. 3.The recommended installation method is as follows, and the horizontal surface from parallel 0 ° to tilt angle between 45 ° is suitable for good installation angle, photoelectric switch front cone radius of 30mm, there must not be any reflective surface or other interference. 4.Photoelectric switch cone sensor front and barrel wall distance of at least 30mm, photoelectric switch installation threaded casing, photoelectric switch sensor head must be exposed to the casing. Avoid using in the following places, generally may cause the photoelectric switch misoperation, try to avoid. ● Places with more dust. ● Places where there are more corrosive gases. ● Places where water, oil, and chemicals are likely to splash directly. Places where there is direct light from outdoor or sunlight without shading measures. ● Places where the ambient temperature changes beyond the range specified in the product. ● Places where vibration and shock are large and no shock-absorbing measures have been taken. I hope the above can help you to install and use the photoelectric level switch correctly.

1. Measuring the length of products in production 2. In the production of enameled wire, steel wire, steel strip and cloth, the product length can be measured using the method as shown in Figure 13-12. The length measuring roller is mounted on the same shaft as the toothed disc, and the proximity sensor is mounted on the side of the toothed disc. If the number of teeth of the toothed disc is N, then the long-range proximity sensor outputs N pulses for each week of rotation of the toothed disc. At this time, the length measuring roller coaxial with the toothed disc also rotates for one week, which is equivalent to the length of the measured item being rolled over as D, then the length corresponding to each pulse is K=rcD/N The total length of the measured item is L= MK In the formula, D is the diameter of the length measuring roller; M is the total sum of measuring pulses. 3. Counting of production line workpieces The proximity sensor is set on the side of the workpiece conveyor, when the conveyor is running, one workpiece passes the proximity sensor: when the workpiece is close to the sensor, the proximity sensor outputs the pulse switch signal. 4. the limit of the robot 5. In the automatic production line using a variety of manipulators, they are constantly engaged in the work of handling work pieces. To ensure the accuracy of the robot gripping and placing the workpiece position. In order to ensure the accuracy of the robot gripping and placing the workpiece position, Zhuang often use long-distance proximity sensors to limit their range of motion. The proximity sensor is set at the left and right position of the robot arm, and when the robot arm moves left and right near the proximity sensor, the sensor senses the proximity of the arm and outputs a control signal when the specified detection distance is reached, and the robot is stopped by the actuator.

Photoelectric switch is a kind of sensor, which converts the change of light intensity between the transmitting end and the receiving end into the change of current to achieve the purpose of detection. The photoelectric sensor is a new generation photoelectric switch device manufactured by using integrated circuit technology and SMT surface mounting process, which has intelligent functions such as time delay, spreading, external synchronization, mutual interference resistance, high reliability, stable working area and self-diagnosis. This novel photoelectric switch is an active photoelectric detection system type electronic switch using pulse modulation, and the cold light sources it uses are infrared light, red light, green light and blue light, etc. It can non-contact, non-damagingly quickly and control the state and action of various solids, liquids, transparent bodies, black bodies, soft bodies and smoke and other substances. Let's take a look at how to choose photoelectric switches together. Photoelectric switches are used in many applications, such as level detection, liquid level control, product counting, width discrimination, speed detection, fixed-length shear, hole identification, signal delay, automatic door sensing, color-coded detection, punching and shearing machines, and security protection, among many other fields. In addition, using the concealment of infrared light, it can also be used in banks, warehouses, stores, offices and other occasions where needed as anti-theft alarms. Photoelectric switches are simple, small and relatively durable.

Photoelectric sensors are highly used not only in industrial production but also in our daily life. 1. Analysis of the current market situation Photoelectric sensors are based on the photoelectric effect, the measured change in the light signal, into an electrical signal or other required form of information output. Photoelectric sensors have the advantages of high accuracy, fast response, non-contact, and many measurable parameters, the structure of the sensor is simple, so the application of photoelectric sensors is very wide, such as LED lighting, security, smart home, intelligent transportation, intelligent agriculture, toys, wearable devices and other digital electronic products. In the future, with the development and popularity of the Internet of Things technology, photoelectric sensor applications will penetrate into all aspects of human life. Pyroelectric infrared sensor segmentation profile: pyroelectric infrared sensor in the form of non-contact detection of changes in infrared energy radiation from the human body, and will be converted into an electrical signal output; the electrical signal will be amplified, it can drive a variety of control circuits, such as for power switch control, burglar and fire alarm, automatic monitoring, etc.. Pyroelectric infrared sensor itself does not emit any radiation, device power consumption is small, and has a strong anti-interference. At present, China's pyroelectric infrared sensors have been widely used in LED lamps, security, smart home, toys and other products. Due to the cost advantage of Chinese manufacturing, coupled with the increasing maturity of manufacturing technology, China has become a global pyroelectric infrared sensor manufacturing center. 2.The market scale analysis China is currently in an important stage of development of industrial industrial structure upgrading, the future of industrial manufacturing will gradually to the high-end development, which makes sensors and other automation-related products usher in a good opportunity for development. Photoelectric sensors as the most basic is also the most widely used sensors, also ushered in a bright future. Photoelectric sensors in food and beverage production lines, packaging machinery, machine tools, electronic semiconductors, three-dimensional warehouse, security facilities and many other fields have a wide range of applications. Times are progressing, society is developing, optoelectronics has become an indispensable part of people's lives, and the development of photoelectric sensors has been very rapid in recent years.

The photoelectric sensor uses a photoelectric element as the detection element to first transform the measured change into a change in signal, and then further converts the optical signal into an electrical signal with the help of the photoelectric element. Photoelectric sensors generally consist of 3 parts: light source, optical path and photoelectric element. Photoelectric detection method has the advantages of high accuracy, fast response, non-contact, and more parameters can be measured, the structure of the sensor is simple, flexible and diverse forms, small size. In recent years, with the development of photoelectric technology, photoelectric sensor has become a series of products, its variety and production is increasing, users can choose a variety of specifications according to the needs of the product, in a variety of light industrial automatic machine to obtain a wide range of applications. 1. Optical strip runout detector Strip runout detector is used to detect the size and direction of strip material deviating from the correct position in processing, so as to provide a correction signal for the correction control circuit, mainly used in the production process of printing and dyeing, paper feeding, film and magnetic tape. 2. Package filling height detection The finished products packaged by volumetric method, in addition to a certain error range requirements for weight, generally also have certain requirements for the filling height to ensure the quality of the appearance of goods, does not meet the filling height of the finished product will not be allowed to leave the factory. Shown is the principle of controlling the filling height with the help of photoelectric detection technology. When the filling height h deviation is too large, the photoelectric connector has no electrical signal, that is, the actuator will push out the packaging items for processing. 3. photoelectric color quality detection Photoelectric color quality detection principle. If the packaging items specified base color is white, due to poor quality, some appear yellowing, before the product packaging by photoelectric detection of color quality, items yellowing, there is a comparative voltage difference output, turn on the solenoid valve, by the compressed air will be yellowing items blow out. 4. color plastic packaging bag making plastic film position control The rolled plastic film printed with trademarks and text, and positioning color mark. Packaging requires accurate positioning of the trademark and text, and shall not cut the pattern in the middle. The position of the trademark on the film is detected by the photoelectric system and amplified to control the electromagnetic clutch. When the color mark on the film (a small area that does not transmit light, usually black) does not reach the position of the positioning color mark, the photoelectric system can make the electromagnetic clutch have electricity and absorb because the light from the light thrower can pass through the film, and the film can continue to move. After this signal is converted and amplified by photoelectricity, the electromagnetic clutch is disconnected, and the film stops at the position precisely, and then continues to move after it is cut off. In addition, the presence or absence and width of the fabric can be detected by using the reflective photoelectric sensor. The sagging of the fabric is detected by using the masking photoelectric sensor, and the result can be used to adjust the tension of the fabric in the transmission. Using the reflective photoelectric sensor installed on the frame, the empty box of missed products can be found and the empty box can be pushed out by using the oil cylinder.

Proximity sensors are a general term for sensors that replace contact detection methods such as limit switches for the purpose of detecting objects without touching them. It converts the movement and presence information of the detected object into an electrical signal. Among the detection methods that convert into electrical signals, there are methods that use eddy currents generated in the metal body of the detection object caused by electromagnetic induction, methods that change the capacity of electrical signals caused by the proximity of the trapped object, and methods that use sharp stones and guide switches. Summary: A proximity sensor is a device with the ability to sense the proximity of an object. It uses the sensitive characteristics of a displacement sensor to identify the proximity of an object and output the corresponding switch signal, and is therefore often referred to as a proximity switch. [1] It is a general term for a sensor that detects the movement and presence information of an object and converts it into an electrical signal without touching the object to be detected, instead of a contact detection type detection method such as a switch. [2] In the JIS specification, the JIS specification (JIS C 8201-5-2 Low-voltage switching devices and control devices, Section 5 Control circuit machines and switching elements, Section 2 Proximity switches) is based on IEC 60947-5-2 for switches for non-contact position detection. In the JIS definition, products that can detect the proximity of an object and the presence or absence of a nearby detection object in a non-contact manner in a sensor are called "proximity switches" and consist of induction, electrostatic capacity, ultrasonic, photoelectric, and magnetic types. In this technical guide, inductive type proximity sensors that detect the presence of metal, electrostatic capacity type proximity sensors that detect the presence of metal and non-metal objects, and switches that use a DC magnetic field generated by magnetic force are defined as "proximity sensors". Principle: Detection principle of inductive type proximity sensors The magnetic loss caused by the eddy current generated on the surface of a conductor is detected by the influence of an external magnetic field. The way to detect the impedance change caused by the eddy current generated by the metal body of the body by making it generate an AC magnetic field in the detection coil and detecting it. In addition, as another way, an aluminum detection sensor that detects the frequency phase component, and an all-metal sensor that detects only the impedance change component through the working coil are included. The state of the transformer occurs on the surface of the detection body side and the sensor side. Special Features: ① Non-contact detection is possible, so there is no abrasion or damage to the object to be detected. ② The contactless output method extends the life (except for the magnetic type), and the semiconductor output has no effect on the life of the contact. ③ Unlike the light detection method, it is suitable for use in environments such as water and oil and is virtually unaffected by stains, oil, water, etc. of the object to be detected during detection. Teflon housing type and products with good chemical resistance are also available. ④ High-speed response compared to contact switches ⑤ A wide temperature range is possible (6) Detection of changes in physical properties of the test object is not affected by the color of the test object, so it is almost independent of surface color, etc. (7) Unlike contact, the sensor is affected by the surrounding temperature, surrounding objects, and similar sensors, including induction type and electrostatic capacity type, and the sensors affect each other. Therefore, it is necessary to consider mutual interference for the setting of sensors. In addition, in the induction type, the influence of surrounding metal needs to be considered, while in the electrostatic capacity type, the influence of surrounding objects needs to be considered. Applications: Proximity sensors are mainly used to detect the displacement of objects and are widely used in aviation and aerospace technology as well as in industrial production. In daily life, such as hotels, restaurants, garages, automatic doors, automatic heaters are used on the application. In security and theft prevention, such as data archives, treasury, finance, museums, vaults and other important places, are usually equipped with anti-theft devices consisting of various proximity switches. In measurement technology, the measurement of length and position; in control technology, such as displacement, speed, acceleration measurement and control, also use a large number of proximity switches.

The working principle of human proximity sensors ① The human proximity sensor contains a high frequency transmitter that causes the coil to emit a high frequency magnetic field. ② The proximity of the object to the high frequency magnetic field causes eddy currents to be generated on the surface of the object, and the eddy currents in turn cause magnetic fields in opposite directions. ③ The transmitter is offset by the influence of the magnetic field caused by the eddy current and stops vibrating. ④ The control output is turned ON/OFF by the presence or absence of vibration. Among the various types of switches, there is a component that has the ability to "sense" the proximity of an object - the displacement sensor. Using the sensitivity of the displacement sensor to the proximity of the object to control the switch on or off, this is the proximity switch. The main performance characteristics of the human proximity sensor Has the function of penetrating walls and non-metallic doors and windows; can detect the distance of the human body, and the distance can also be adjusted, adjustable radius of about half a meter; detection area wide range, because the detection area is a double sector; high adaptability to the ambient temperature range, and high sensitivity; to achieve a flying contact detection; can adapt to harsh environments, such as high temperature, humidity, noise, airflow, dust, light, etc.; to RF has a strong anti-interference ability What can human proximity sensors do Human proximity sensors are widely used in many fields and have won recognition and popularity, such as in the fields of trigger monitoring video for ATMs, aerospace, safes, and industrial production, etc. In daily life, they can be used in hotels and restaurants, automatic garage doors, automatic heaters, etc. Human proximity sensors can also be used in the field of security and anti-theft, such as data files, Finance, accounting, museums, vaults and other important places, at the same time, in the measurement technology and control technology is also widely used, such as length and position measurement, displacement, speed, acceleration measurement and control. In the application of machine tools, metallurgy, chemical industry, light textile, printing and other industries, when the metal monitoring body passes through the detection area, the switch will quickly issue electrical commands without contact, spark or pressure, accurately reflecting the specific position and travel of these objects.

Applications of photoelectric sensors A photoelectric sensor is a device that converts an optical signal into an electrical signal. Its working principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light is irradiated on certain substances, the electrons of the substances absorb the energy of photons and the corresponding electrical effects occur. According to the photoelectric effect of the phenomenon of different photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect and photovoltaic effect. Photovoltaic devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, photocells and so on. The performance and characteristic curves of photoelectric devices are analyzed Chinese name: photoelectric sensor Components: light source, optical path and photoelectric element Foreign name: photoelectric sensor/micro sensor Purpose: the measured change into the change of optical signal Subject: Physics Principle: photoelectric effect Sensor Overview Editor Photoelectric sensors are generally composed of 2 parts: the processing path and the processing element. The basic principle is based on the photoelectric effect, the measured changes into changes in the optical signal, and then with the photoelectric element to further convert the non-electrical signal into an electrical signal. Photoelectric effect is to use light to irradiate a certain object, can be seen as a series of photons with a certain energy for the bombardment of the object, then the photon energy is transferred to the electron, and is a photon of all the energy at once by an electron absorbed, the electron gets the photon transfer of energy after its state will change, so that the object irradiated by light to produce the corresponding electrical effect. Usually the photoelectric effect is divided into three categories: (1) in the role of light can make the electron overflow object surface phenomenon called external photoelectric effect, such as phototubes, photomultiplier tubes, etc.; (2) in the role of light can make the object resistivity change phenomenon called internal photoelectric effect, such as photoresistors, phototransistors, etc.; (3) in the role of light, the object produces a certain direction of electric potential phenomenon called photovoltaic effect, such as photovoltaic cells, etc. such as photocells, etc. Photoelectric detection method has the advantages of high accuracy, fast response, non-contact, and more parameters can be measured, the structure of the sensor is simple, flexible and diverse forms, therefore, photoelectric sensors in the detection and control is very widely used Photoelectric sensor is the key element of photoelectric conversion in various photoelectric detection systems, it is the light signal (visible and ultraviolet laser light) into an electrical signal device The photoelectric sensor is a sensor that uses a photoelectric device as a conversion element. It can be used to detect non-electrical physical quantities that directly cause light changes, such as light intensity, light level, radiation temperature measurement, gas composition analysis, etc.; it can also be used to detect other non-electrical quantities that can be converted into light changes, such as part diameter, surface roughness, strain, displacement, vibration, speed, acceleration, as well as the shape of the object, the identification of the working state, etc. Photoelectric sensors are widely used in industrial automation devices and robots because of their non-contact, fast response and reliable performance. New optoelectronic devices are emerging, especially the birth of CCD image sensors, creating a new page for the further application of optoelectronic sensors. Photoelectric sensors are used in 1. Photoelectric sensors used in laser weapons Because the photoelectric sensor to infrared radiation, or visible light, or to both are particularly sensitive, and therefore more likely to become the target of laser attacks. In addition, the electronic system and the sensor itself is also very vulnerable to laser-generated thermal noise and electromagnetic noise interference and can not work properly. Laser weapons on the battlefield to attack optoelectronic sensors in the following ways: the appropriate energy of the laser beam will be the sensor "blind", so that it can not detect or continue to track the target has been detected. Alternatively, if the sensor is guiding a weapon toward a target, blinding will cause it to lose its target. In summary, as sensors play an increasingly important role on the battlefield and are vulnerable to laser attacks, they have become the preferred target for low-energy laser weapons. 2. Photoelectric sensors used in automatic meter reading system With the development of microelectronics technology, sensor technology, computer technology and modern communication technology, photoelectric sensors can be used to develop automatic meter reading systems. The aluminum disk of the energy meter is driven by the torque generated by the eddy current and magnetic field and rotates. The use of photoelectric sensors can be converted into the number of pulses of the aluminum disk rotation. For example, if the rotating bright aluminum disk is partially painted black, and then equipped with reflective photoelectric transmitting and receiving pair of tubes, when the aluminum disk rotates, pulses will be generated at the partially painted black, and the number of rotations of the aluminum disk can be sampled and converted into the corresponding number of pulses, and sent to the T0 port of CPU for counting by photoelectric coupling isolation circuit. The use of photoelectric coupling isolator can effectively prevent interference signals from entering the microcomputer. Combined with other transmission methods, it can form an automatic meter reading system. 3.Photoelectric sensor applied to monitor smoke pollution Photoelectric sensor is a small electronic device, it can detect the changes in the light intensity it receives, by converting the changes in light intensity into changes in electrical signals to achieve control functions. Since photoelectric sensors have the characteristics of non-contact, fast response and reliable performance, they are widely used in industrial automation devices and robots, and we can use the characteristics of photoelectric sensors to detect the situation of smoke and dust, so the strength of the output signal of photoelectric sensors can reflect the changes in the turbidity of the flue 4. Sanitary flush-proof photoelectric sensor The flush-proof sensor provides high reliability and comfort, and minimizes operating costs. Combined with the IO-Link interface and the proTect+ sealing concept for a significantly longer service life, these two new sensors are ideal solutions for the food and beverage industry in demanding applications.