Apparatus for measuring the thickness of an electrically non-conductive material on a metallic base
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United States of America Patent
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Mar 27, 1990
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N/A
app pub date -
Sep 29, 1988
filing date -
Sep 29, 1987
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Expired
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Abstract
An apparatus for measuring the thickness of a coating of, for example, paint or other electrically non-conductive material on a metallic base comprises a sensor head housing an electrical measuring coil and supported above the coating on a cushion of air. The air is supplied at a constant predetermined pressure to nozzles carried by the sensor head, and a constant force urging the sensor head towards the surface of the material is yieldably applied to the sensor head through a spring.
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