Little knowledge of RF sensors

　　Under normal circumstances, the radio frequency sensor is composed of two parts: a processing path and a processing element. Its basic principle is to use the photoelectric effect to convert the measured changes into optical signal changes, and then use photoelectric elements to further convert non-electrical 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 electrical 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 the external photoelectric effect, such as photoelectric tubes, photomultiplier tubes, 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.

　　RF 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.

　　RF sensor is a sensor that uses optoelectronic devices as conversion elements. The system can detect the non-electrical physical quantities that directly lead to 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. Optoelectronic sensors have the characteristics of non-contact, fast response, and reliable performance, so they are 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 optoelectronic sensors.

Read recommendations:

High temperature resistant glass metal tube splicing NTC temperature sensor.PIR Movement Detector

New High Temperature NTC Thermistor.Mini PIR Sensor Vendor

MF5A 103F3950FL120 lacquered wire

Diameter 3mm size

PIR300B Analog sensor