Infrared detectors and detector arrays are used in many fields of applications today, both civilian and defence oriented. Many of these are based on passive detection of thermally emitted electromagnetic radiation as described by the wellknown Planck's law. In this way it is possible to image objects in darkness, or carry out contactless temperature measurement. Active systems, on the other hand, are basedon illumination of the object by an infrared source, such as a thermal emitter or an infrared laser.
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