Electromagnetic scanner
Electromagnetic scanners were sensor devices carried aboard  starships. These scanners included gamma pulse generators.

In 2366, when the 's computer systems became infested with nanites, Captain Picard ordered Worf to prepare to use the generators to irradiate the systems in order to neutralize the nanites. ()

In 2367, the Enterprises lateral EM scanners detected levels of radiation that were indicative of the presence of a class M planet, but the planet in question was momentarily invisible to the sensors. ()

See also
Electromagnetic radiation
EM scan

nl:Elektromagnetische scanner
Sensor technology
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