Detailed explanation of radio frequency sensors

　　The radio frequency sensor is a small electronic device, a key element for realizing photoelectric conversion in various photoelectric detection systems. It is mainly a sensor that uses various properties of light to detect the presence or absence of objects and changes in surface conditions. Photoelectric sensors have the characteristics of non-contact, fast response, and reliable performance, so they are widely used in industrial automation devices and robots.

　　RF sensor

　　RF sensor is generally composed of three parts: light source, optical path and photoelectric element. The measured change is converted into a change in an optical signal, and then the optical signal is further converted into an electrical signal with the help of a photoelectric element.

　　Principle of photoelectric effect

　　The photoelectric element is the most important part of the radio frequency sensor, and its core working principle is different types of photoelectric effect. According to the wave-particle duality, light is composed of photons moving at the speed of light. When an object is illuminated by light, its internal electrons absorb the energy of the photon and change state, and its own electrical properties will also change. This phenomenon is called For the photoelectric effect.

　　According to different changes in electrical properties, the photoelectric effect is divided into the following three types:

　　1) External photoelectric effect

　　The phenomenon that electrons escape from the surface of an object under the action of light is called the external photoelectric effect. Photoelectric components based on external photoelectric effect include phototubes, photomultiplier tubes, etc.

　　2) Photoconductive effect

　　The phenomenon that electrons in a semiconductor cannot jump out of the semiconductor after absorbing a photon, changing the conductivity of the object, or generating a photoelectromotive force is called the internal photoelectric effect. The internal photoelectric effect can be divided into photoconductive effect and photovoltaic effect according to its working principle. Photoelectric components based on the photoconductive effect include photoresistors, phototransistors, etc.

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