Infrared detectors can be divided into two types : those which depend upon heating effects produced by the absorbed radiation (thermal detectors) and those which make use of photoelectric effects (photodetectors). Infrared image sensors using photodetectors show high detectivities, but must be cooled down for proper operation. Thermal detector sensors are slow responding and have relatively low sensitivity, but can operate even at room temperature. In this paper we describe our experiments and other recent works of the thermal infrared image sensors.
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