Begin with the most pressing general questions base on the major surveys of astronomy and astrophysics today, the paper introduce the mission of deep space infrared detection, and the main requirements for infrared detectors, then introduce the principles and performance of cutting edge infrared detectors, readout integrated circuit and Application Specific integrated Circuit (ASIC) for deep space observatory. Base on present state of the infrared detectors, propose advices for developing Chinese infrared Focal Plane Array (FPA) detector for deep space observatory.
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