The second-generation infrared imaging technology uses an infrared focal plane detector array (IRFPA), thereby eliminating the need for optical-mechanical scanning mechanisms. This kind of focal plane array uses the integrated circuit method to install the detector on the same chip and has signal processing function, and uses a very small number of wires to read out the signals of thousands of detectors on each chip to the signal processor. middle. Due to the absence of optical machine scanning, this kind of sensor with large-scale focal plane imaging is also called staring sensor. It is small in size, light in weight and high in reliability. In the pitch direction, there can be a detector array of more than a few hundred yuan, which can obtain a larger field of view, and a special scanning mechanism can be used to complete a 360° omnidirectional at a much slower scanning speed than a general-purpose thermal imager. Scan to stay alert. Such devices mainly include InSbIRFPA, HgCdTeIRFPA, SBD FPA, uncooled IRFPA and multiple quantum well IRFPA, etc.