Study And Application Of A Flat Eddy-Current Proximity Sensor

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Abstract
We have realized a flat coil on a printed circuit with epoxy resin support. This way we easily obtained single or double faced flat coils. By incorporating such a coil into an oscillator we have obtained an inexpensive manufacturing proximity sensor. It is an eddy-current transducer which uses the principle of impedance variation. An eddy-current is induced into a conductive metal target and monitored by the proximity detector. The study of the transducer frequency response has permitted us to develop some applications like the detection of an edge of sheet metal or the accurate location of a circular aperture in an iron sheet. From the main sensor properties we have developed three different kinds of devices.

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