Nonlinear junction detectors (Semiconductor device detectors) are used to detect covert surveillance devices mounted in building structures, furniture or other interior features.
The working principles of NLJDs provide the possibility of sweeping for electronic devices, regardless of whether they are active (turned on) or inactive. Moreover the detection of individual p-n junctions, meaning single diodes, is also possible. A nonlinear junction detector is a small-sized radar and consists of an antenna and a control unit. The antenna creates an electromagnetic field in the suspect area or target by means of a high frequency radio emission signal.

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