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There are two basic ranges of infrared; long-wave infrared and medium-wave infrared. The long-wave infrared (LWIR) cameras, sometimes called "far infrared", operate at 8 to 12 micrometre and can see heat such as hot engine parts or human body heat a few miles away, but longer distance viewing is made more difficult because the infra-red light is absorbed, scattered and refracted by the air and water vapor. Some long-wave FLIRs require their detector to be cryogenically cooled, although moderately sensitive FLIRs are produced that do not require cryogenic cooling.

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It uses material from the Wikipedia article "Forward Looking Infrared."