Our eyes are sophisticated detectors that have biologically evolved to “see” visible (or optical) light. There are, however, many other types of light – or radiation — which we cannot see without the aid of technology.
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The development, testing, and improvement of infrared detectors has resulted from a productive collaboration between aerospace and industrial firms (primarily funded by the military) and university researchers (funded primarily through NASA). These research efforts into infrared detector technologies have led to many useful applications, apart from defense and space science purposes.
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