Description of photoelectric proximity sensor

The photoelectric switch uses the light source as the medium and applies the photoelectric effect. When the light source is blocked by an object or the amount of light is changed due to reflection, radiation and shadow, it detects the presence, size and brightness of the object, and outputs the signal to the switching element that generates contact and non-contact. There are several types of photoelectric switches. They do not have their own light source and use the change of light emitted by the object to detect; use natural light to illuminate the photoelectric switch, and the object blocks natural light to produce a closed change; the photoelectric switch has its own light source, which can detect the detected object Changes in reflection, absorption and transmission. Commonly used light sources include ultraviolet light, visible light, infrared light and other wave-band light sources, bulb types, LEDs, laser tubes, etc., and output signals include switch or analog and communication data information.