Photoelectric switch principle！

Photoelectric switch principle
    

1. The photoelectric switch principle - Introduction

Photoelectric switches, photoelectric sensors, photoelectric proximity switches is short, it is mainly the use of the test object to blocked or reflected beam, by the synchronization loop gating circuit to detect the presence or absence of an object. Photoelectric switch is a sensor, which changes the intensity of light between the transmitter and the receiver is converted to the current changes in order to achieve the purpose of detection. Since the photoelectric switch output circuit and input circuit are electrically isolated, can effectively reduce the wear and tear, and has the characteristics of fast, so it can be applied in many occasions.

2. The principle of photoelectric switches - Features

A new generation of photoelectric switch with integrated circuit technology and SMT surface mount technology, with a delay, broadening, external synchronization, anti-interference, high reliability, and work for regional stability and self-diagnosis and other intelligent features. This novel is a photoelectric switch using pulse modulated active optical detection system electronic switch, cold light source it uses infrared light, red light, green light and blue light, etc., can be non-contact, non-invasive rapidly and control a variety of solid, liquid, transparent body, bold, soft body and smoke and other substances of states and actions. With a small, multi-function, long life, high precision, fast response, the detection distance and anti-light, electricity, magnetic interference ability of the advantages.

The photoelectric switch principle

Photoelectric switch is a transmitter, receiver and detector circuit of three parts. Transmitter emits a light beam at the target, the beam emitted from the light emitting diode and general laser diode. Continuously transmitting a beam or pulse width is changed. By the beam of radiation intensity in pulsed emission elapsed times to select, run toward the goal of not indirectly. The receiver has a photodiode or phototransistor components. In front of the receiver, equipped with optical elements such as lenses and iris. In the detection circuit behind it, it can filter out the valid signal and the signal is applied.

Previous：How to choose a photoelectric sensor
Next：Automation Instrumentation and sensor in huge market