Apparatus for measuring the thickness of an electrically non-con

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material

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Details

73 376, 738658, 324262, G01B 710, G01R 3312

Patent

active

049124102

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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patent: 3610024 (1971-10-01), Honjo et al.
patent: 3818327 (1974-06-01), Alexander
patent: 3857095 (1974-12-01), Mitchie et al.
patent: 3884076 (1975-05-01), Studer
patent: 4107606 (1978-08-01), Typpo et al.
patent: 4647855 (1987-03-01), Berglund
patent: 4742299 (1988-05-01), Stone

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