To detect the signal amplifying, filtering, and extract the information from these signals.And then converted to the
required format of such information, and finally to control equipment or display.
Infrared detectors are divided into heat detector and two photon detector. (1) thermal detector Using the infrared radiation heating, the probe of absorb radiant energy caused by temperature sensitive element, and then makes some relevant physical parameters change, by measuring the change of physical parameters to determine the infrared radiation received by the detector.
(2) the photon detector Using the incident optical radiation photon flow detector and materials of electronic interact with each other, and transform the energy of the electron state, cause all sorts of electrical phenomenon.
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