Zirconium liner thickness measuring method and an apparatus...

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

G - Physics

21

C

324/53

G21C 17/06 (2006.01)

Patent

CA 1237773

ABSTRACT OF THE DISCLOSURE 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. - 31 -

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