Zirconium liner thickness measuring method and an apparatus ther

Details Zirconium liner thickness measuring method and an apparatus ther Zirconium liner thickness measuring method and an apparatus ther

1983-09-28

1987-06-16

Cangialosi, Salvatore

Electricity: measuring and testing

Magnetic

With compensation for test variable

324220, 324230, 376245, G01B 710

Patent

active

046738770

ABSTRACT:
A method and apparatus for measuring a liner thickness of a zirconium liner provided at the inner surface of a zirconium alloy tube, the principle of measurement of which is to insert coils into the tube to generate an eddy current, detect the impedance component in the direction perpendicular to the direction of coil impedance change caused by the lift-off variation between the coils and the inner surface of tube, and obtain the liner thickness on the basis of the impedance component. In a case where the lift-off variation is larger, the impedance component in the direction of coil impedance change caused by the lift-off variation is detected, so that the component is used to correct the impedance component perpendicular to the same, thereby obtaining the liner thickness in accordance with the corrected values.

REFERENCES:
patent: 2641841 (1953-06-01), Ladrach
patent: 3132299 (1964-05-01), Hochschild
patent: 3358225 (1967-12-01), Peugeot
patent: 3526829 (1970-09-01), Noble
patent: 4047103 (1977-09-01), Day et al.
patent: 4088953 (1978-05-01), Sarian
patent: 4292588 (1981-09-01), Smith
patent: 4503392 (1985-05-01), Fastritsky et al.
"Thickness Measurements Using Eddy Current Techniques", by C. V. Dodd and W. A. Simpson, Jr., May 1973, pp. 73-79 and 84.

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