Forward looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use an imaging technology that senses infrared radiation. The sensors installed in forward-looking infrared cameras—as well as those of other thermal imaging cameras—use detection of infrared radiation, typically emitted from a heat source (thermal radia...
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http://en.wikipedia.org/wiki/Forward_looking_infrared
(from the article `police`) ...type, are often equipped with a high-intensity spotlight that can provide overhead illumination for units on the ground. Another device used by ...
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http://www.britannica.com/eb/a-z/f/50
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