After the modulated pulse generated by the oscillating circuit passes through the reflection circuit, the digital integration photoelectric switch or RC integration method is used to eliminate interference, and finally the driver is triggered (or not delayed) to output the photoelectric switch control signal.
Using optical elements, the light beam is changed in the middle of the propagation medium; the light beam is used to reflect the object; and the light beam is returned after a long distance. The photoelectric switch is composed of three parts: transmitter, receiver and detection circuit. The emitter is aimed at the target to emit a light beam. The emitted light beam generally comes from a light emitting diode (LED) and a laser diode. The beam is emitted uninterrupted, or the pulse width is changed. The radiation intensity of the pulse-modulated beam is selected multiple times during the launch, and it runs indirectly toward the target. The receiver consists of photodiode or phototransistor. In front of the receiver, optical components such as lenses and apertures are installed. Behind it is the detection circuit, which can filter out the valid signal and apply the signal.