Inductive proximity sensor with periodic switching for sensing t

Electricity: measuring and testing – Magnetic – Displacement

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32420726, 324239, 324329, 324336, G01B 700, G01V 310, H03K 1795

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active

054989582

ABSTRACT:
An inductive proximity sensor determines if a metallic object is in close proximity. An inductor is placed near the object. Several switches control the direction of the voltage passing through the inductor. During a first time period, the voltage flows through the inductor to induce a magnetic field in the object. During the second time period, the voltage is reversed in the inductor to quickly eliminate any current in the inductor. The decaying magnetic field in the object induces a voltage in the inductor which is measured during a third time period and compared to a reference value to determine the proximity of the object to the sensor.

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Colani, C. "A New Type of Locating Device I-The Instrument", Archaeometry, pp. 3-8, Received in U.S.P.T.O. Jan. 27, 1979.

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