Method and apparatus for measuring thickness of a test part by a

Details Method and apparatus for measuring thickness of a test part by a Method and apparatus for measuring thickness of a test part by a

1985-12-17

1988-02-23

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324207, 324202, G01B 712

Patent

active

047273224

ABSTRACT:
A method of measuring a characteristic, such as thickness, of a test part makes use of the variation in impedance of a coil in a senor caused by eddy currents generated as a result of the proximity of the test part. The sensor measures two orthogonal components of the complex impedance. In use the sensor is moved towards the test part until one component of the impedance reaches a predetermined value and the characteristic measured as the value of the other component. The first component is selected during calibration as that component which is most sensitive to variation in the distance between the sensor and the test part.

REFERENCES:
patent: 3358225 (1967-12-01), Peugeot
patent: 3496458 (1970-02-01), Bromley
patent: 3718855 (1973-02-01), Rogel et al.
patent: 4186792 (1980-02-01), Yamada et al.
patent: 4215310 (1980-07-01), Schwerer, III
patent: 4314203 (1982-02-01), Haberlein
patent: 4438754 (1984-03-01), Nanny et al.
patent: 4596953 (1986-06-01), Nagasaka et al.
patent: 4644274 (1987-02-01), Casarcia

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