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A thermal imaging sensor where sensor output is based on [[infrared]] [[radiation]] (usually between 3-5 or 8-12 micron spectral range) generated by the external scene. FLIRs are used for [[targeting acquisition]] and aircraft pilotage on both the AH-64 Apache and the newly developed RAH-66 Comanche.
==References==
http://www.usaarl.army.mil/hmdbook/cp_011.htm