Why does the infrared sounder require cooling? How many degrees does it cool down?
Infrared detectors can be roughly divided into two types: thermal and quantum. The utility model has the advantages of high sensitivity, good spatial resolution, large dynamic range, strong anti-interference ability, and can work day and night in bad weather.
The commonly used infrared detectors are based on the GaAs series and the InP series as the center of the design technology of the class III semiconductor multi quantum well materials.The infrared detector is promising in the military HgCdTe infrared detector, PtSi detector, GaAs detector and infrared two-color infrared detector, its performance directly determines the image quality of thermal imager. To make them work properly, they must be installed in a Dewar bottle, otherwise it will cause contamination of the detector and frosting at low temperatures. That is to say, must use liquid nitrogen or helium for cooling on them, the cooling to liquid nitrogen or helium temperature.
Quantum detectors can also be divided into photoconductive detectors and photovoltaic detectors. The sensitivity of the quantum detector is 1~2 orders of magnitude higher than that of the thermosensitive type, and the response speed is fast. The performance is close to the infrared limit of the background limit. But military quantum detectors must be cooled. After refrigeration, the device can shorten the response time and improve detection sensitivity.
The thermal detector is characterized by its wide detection band and the ability to operate at normal ambient temperatures without cooling, but its sensitivity is low and its response is slow
