Induction loop
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One use of an induction loop is in inductive loop detection where the coil is used to detect metal objects. Applications for this include vehicle detection, metal detectors, etc. The principle of operation is a changing inductance which changes the frequency of an oscillator of which the inductive loop forms a part.
An [anti-submarine indicator loop] was also a device used to detect submarine and surface vessels using submarine cables connected to an indicator.
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