The working principle of infrared sensor

Infrared sensors have played a huge role in modern production practices. With the improvement of detection equipment and other parts of the technology, infrared sensors can have more performance and better sensitivity.

(1) Waiting side target. The infrared system can be set according to the infrared radiation characteristics of the target to be side.

(2) Atmospheric attenuation. When the infrared radiation of the target to be measured passes through the earth’s atmosphere, due to the scattering and scattering of gas molecules, various gases and various sol particles

Absorption will attenuate the infrared radiation emitted by the infrared source.

(3) Optical receiver. It receives part of the infrared radiation of the target and transmits it to the infrared sensor. It is equivalent to a radar antenna and is commonly used as an objective lens.

(4) Radiation modulator. The radiated light from the target under test is modulated and changed to provide target azimuth information and can filter out large-area interference signals. Also known as modulation disc and chopper, it has a variety of structures.

(5) Infrared detector. This is the core of the infrared system. It is a sensor that uses the physical effects presented by the interaction between infrared radiation and matter to detect infrared radiation. In most cases, it uses the electrical effects presented by this interaction. Such detectors can be divided into two types: photon detectors and thermally sensitive detectors.

(6) Detector cooler. Because some detectors must work at low temperatures, the corresponding system must have refrigeration equipment. After cooling, the device can shorten the response time and improve the detection sensitivity.

(7) Signal processing system. Amplify and filter the detected signals, and extract information from these signals. This information is then converted into the required format, and finally sent to the control device or display.

(8) Display equipment. This is the terminal device of the infrared device. Commonly used displays include oscilloscopes, picture tubes, infrared photosensitive materials, indicating instruments and recorders.