Method for determining thickness of ferromagnetic material depos

Details Method for determining thickness of ferromagnetic material depos Method for determining thickness of ferromagnetic material depos

1993-05-12

1994-08-30

Walsh, Donald P.

Measuring and testing

Coating material: ink adhesive and/or plastic

376255, G01B 2108

Patent

active

053416783

ABSTRACT:
A method for determining the thickness of ferromagnetic material deposited on a nuclear fuel rod. Calibration samples of known thickness and known permeability are placed between the probe of an eddy current sensor and a conductive surface. A plurality of calibration points are plotted to provide a characteristic complex impedance diagram for a probe excited at a predetermined frequency. Then the complex impedance of the probe excited at the selected frequency is measured when in proximity to a fuel rod having a corrosion layer of unknown thickness and unknown magnetic permeability. For each probe position, the two components of the complex impedance, i.e., the inductive reactance and the resistance, are determined and plotted on the characteristic complex impedance diagram. The position of the measured data point relative to the calibration points enables one to determine the lift-off error due to the presence of ferromagnetic material.

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Eddy Current Evaluation of Nuclear Control Rod by C. V. Dodd. Material Evaluation (USA) May 1974, vol. 32, No. 5 pp. (93-99).

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