Application of RF sensor

　　A radio frequency sensor is a device that converts light signals into electrical signals. Its working principle is based on the photoelectric effect. The photoelectric effect means that when light is irradiated on some material, the electrons of the material absorb the energy of the photon and the corresponding electric effect occurs. According to the different phenomena of photoelectric effect, the photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and photocells. Analyzed the performance and characteristic curves of optoelectronic devices

　　Chinese name: RF sensor Composition: light source, optical path and photoelectric element

　　Foreign name: photoelectric sensor/micro sensor Purpose: The measured change is converted into a change in optical signal

　　Subject: Physics Principle: Photoelectric Effect

　　Sensor overviewedit

　　The radio frequency sensor is generally composed of two parts: a processing path and a processing element. The basic principle is based on the photoelectric effect, which converts the measured changes into optical signal changes, and then further converts non-electrical signals into electrical signals with the help of photoelectric elements. The photoelectric effect refers to illuminating an object with light, which can be regarded as a series of photons with a certain energy bombarding the object. At this time, the energy of the photon is transferred to the electron, and the entire energy of a photon is absorbed by one at a time. When the electron is absorbed, the state of the electron will change after it gets the energy transmitted by the photon, so that the object irradiated by the light produces a corresponding electric effect. The photoelectric effect is usually divided into three categories: (1) The phenomenon that can cause electrons to overflow the surface of the object under the action of light is called the external photoelectric effect, such as photoelectric tube, photomultiplier tube, etc.; (2) The phenomenon that can make the object under the action of light The phenomenon that the resistivity changes is called the internal photoelectric effect, such as photoresistors, phototransistors, etc.; (3) The phenomenon that an object generates a certain directional electromotive force under the action of light is called the photovoltaic effect, such as photovoltaic cells, etc.

　　The photoelectric detection method has the advantages of high accuracy, fast response, non-contact, etc., and has many measurable parameters. The sensor has a simple structure and flexible forms. Therefore, the photoelectric sensor is widely used in detection and control.

　　The radio frequency sensor is a key component for photoelectric conversion in various photoelectric detection systems. It is a device that converts optical signals (visible and ultraviolet laser light) into electrical signals

　　The photoelectric sensor is a sensor that uses a photoelectric device as a conversion element. It can be used to detect non-electrical physical quantities that directly cause changes in light quantity, such as light intensity, illuminance, radiation temperature measurement, gas composition analysis, etc.; it can also be used to detect other non-electrical quantities that can be converted into light quantity changes, such as part diameter, surface roughness, Strain, displacement, vibration, speed, acceleration, as well as the recognition of the shape and working state of the object, etc. Photoelectric sensors have the characteristics of non-contact, fast response, and reliable performance, so they are widely used in industrial automation devices and robots. The emergence of new optoelectronic devices, especially the birth of CCD image sensors, has opened a new page for the further application of radio frequency sensors.

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