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Photoelectric sensor is a sensor that uses photoelectric elements as detection elements. It first converts the measured changes into changes in optical signals, and then further converts optical signals into electrical signals with the help of photoelectric elements. Photoelectric sensor is generally composed of light source, optical path and photoelectric element. The principle of photoelectric sensor is to realize control by converting the change of light intensity into the change of electrical signal. Generally speaking, photoelectric sensor consists of three parts, namely transmitter, receiver and detection circuit. The transmitter aims at the target and emits light beam, which generally comes from semiconductor light source, light emitting diode (LED), laser diode and infrared emitting diode