Infrared sensor
Infrared sensors (also referred to as infrared detectors or infrared scanners) were devices used on spacecraft to detect movement by means of infrared light. 

In 2151, Lieutenant Malcolm Reed had to refocus the infrared scanner on board  in order to calibrate the ship's torpedo targeting system. The process took "the better part of a day." () 

In 2266, Captain James T. Kirk used the infrared scanner and sensing system on board the  to search the surface of Rigel XII for Eve McHuron. ()

In 2367, Lieutenant Commander Susanna Leijten suggested installing proximity detectors and infrared sensors on Tarchannen III to locate her former colleagues from the . ()

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de:Infrarotscanner
Tools
Sensor technology
Retconned material in background