Under normal circumstances, the Photoeye sensor consists of two parts: processing path and processing element. The basic principle of the Photoeye sensor is to use the photoelectric effect to convert the measured changes into light signal changes, and then use photoelectric elements to further convert non-electric signals into electrical signals. The "photoelectric effect" refers to illuminating an object with light, which can be regarded as bombarding the object with photons of a certain energy sequence. At this time, the energy of the photon is transferred to the electron, and all the energy of the electron is absorbed by one electron at a time. When the electron gains the energy transferred by the photon, its state will change, so the object irradiated by the light will have a corresponding electric effect. Generally, the photoelectric effect is divided into three categories:

(1) The phenomenon that electrons can escape from the surface of an object under the action of light is called external photoelectric effect, such as photoelectric tube, photomultiplier tube, etc.;
(2) The phenomenon that the resistivity of an object can be changed under the action of light is called the internal photoelectric effect, such as photoresistors, phototransistors, etc.;
(3) Under the action of light, the phenomenon that an object generates an electromotive force in a certain direction is called photovoltaic response, such as a photovoltaic cell.
Photoeye sensor is a device that converts light signals (visible and ultraviolet laser light) into electronic signals, and is a key element for photoelectric conversion in various photoelectric detection systems.
Photoeye sensor is a sensor that uses optoelectronic devices as conversion elements. The system can detect non-electrical physical quantities that directly cause changes in the amount of light, such as light intensity, illuminance, radiation temperature, gas composition analysis, etc.; it can also detect other non-electrical factors, such as part diameter, surface roughness, strain, displacement, Vibration, speed, acceleration, object shape, working condition recognition, etc., are transformed into light quantity changes. Photoeye sensor has the characteristics of non-contact, fast response and reliable performance, so it is widely used in industrial automation equipment and robots. The emergence of new optoelectronic devices, especially the birth of CCD image sensors, has opened up new horizons for the further application of Photoeye sensor.
The editor of Photoeye sensor's little knowledge is shared here. Have you learned new things through this article?