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!