Photoelectric sensor is a sensor that uses photoelectric element as detection element. Firstly, the change of the measured signal is converted into light signal, and then the optical signal is converted into electric signal by means of photoelectric element. The photoelectric sensor is composed of three parts, the light source, the optical path and the photoelectric element.
Photoelectric detection method has the advantages of high precision, fast response, non-contact, and can be measured parameters, the sensor has the advantages of simple structure, flexible and diverse forms. Therefore, photoelectric sensor in the detection and control is widely used.
Photoelectric sensor is all in the photoelectric detection system to achieve the key element of the photoelectric conversion, it is to transform (infrared, visible and ultraviolet laser light) optical signal into electrical signal device.
Photoelectric sensor is photoelectric device as a sensor conversion element. It can be used to detect directly cause the light intensity of non electric quantity, such as light intensity, light intensity, radiation temperature measurement, gas component analysis; also can be used to detect can convert light to other non power, such as part diameter and surface rough degree, strain, displacement, vibration, velocity, acceleration, and the shape of the object, the state recognition. The photoelectric sensor has the advantages of non-contact, fast response characteristics, reliable performance, it is widely used in industrial automation and robot device. The emergence of new optoelectronic devices, especially the birth of CCD image sensor, for the further application of photoelectric sensor to create a new page.