Guide: Infrared sensor , as its name suggests, is an instrument that uses infrared light for sensing. How does it work with infrared light? See below~
First, the working principle of infrared sensor - - Introduction
Infrared sensor , the English name is infra-red sensor, is a kind of sensor that uses infrared light as the medium to complete the measurement function. It has many advantages such as fast response, and has been widely used in many fields such as industry, agriculture, national defense, science and technology.
Second, the working principle of infrared sensors - - classification
The infrared sensor is one of the classifications of the sensor according to different principles, and it can be further classified according to certain conditions. According to different driving modes of infrared radiation tube, it can be divided into level type and pulse type; according to different detection principles, it can be divided into photon detector (detection principle based on photoelectric effect) and heat detector (detection principle based on thermal effect); The functions can be divided into five categories: radiometer, search and tracking system, thermal imaging system, infrared ranging communication system and hybrid system.
Third, the working principle of infrared sensor - - structure
The basic components of the infrared system and their functions are as follows:
1) Target to be tested: The infrared system is set according to its infrared radiation characteristics;
2) Atmospheric attenuation: When the infrared radiation of the object to be tested passes through the atmosphere, it will be attenuated by the influence of various substances;
3) Optical receiver: used to receive part of the infrared radiation and transmit it to the infrared sensor;
4) a radiation modulator: also known as a modulating disk or a chopper for modulating the form of the infrared radiation to provide azimuth information of the object to be tested, and filtering out the interference signal;
5) Infrared detector: the core of the infrared system for detecting infrared radiation;
6) Detector cooler: used to cool the system to improve work efficiency;
7) Signal processing system: the signal is amplified, filtered, etc. to extract the required information and deliver the effective information to the display device;
8) Display device: is the terminal device of the infrared system, used for displaying effective information;
Fourth, the working principle of infrared sensor
We also mentioned above that infrared sensors can be divided into photon detectors and heat detectors according to different detection principles. Below we take the heat detector as an example to describe the working principle of infrared sensors.
The detection principle of the heat detector is based on the thermal effect. When the object to be tested is irradiated, it will cause the temperature to rise and affect the performance change of the object to be tested. Therefore, the radiation can be used to detect the change of the electric quantity or the non-electric quantity of the object to be tested.
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