Calculations of the Flaw Signal Generated by a Differential Eddy-Current Probe
Differential eddy-current probes are attractive because of their insensitivity to lift-off effects. By using two similar coils wound in opposition we have a sensor that detects variations in the magnetic field along a line joining their centers. The impedance plane response of a differential probe to a flaw is rather more complicated than the signal from a single winding probe, but this is a price one must be prepared to pay for nullifying the lift-off signal.
KeywordsConjugate Gradient Algorithm Differential Voltage Pulse Function Excitation Coil Dipole Density
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- 2.L. R. Turner, Ed. Proceedings of the Vancouver Team Workshop, NTIS Report ANL/FPP/TM-230, 1988.Google Scholar
- 4.J. C. Verite, A. Bossavit, J. Cahouet and Y. Crutzen, Eds. Team Workshop and Meeting on the Applications of Eddy-Current Computations, ( Commission of European Communities, Brussels 1989 ).Google Scholar
- 5.R. F. Harrington, Field Computations By Moment Methods, ( Macmillan, New York, 1968 ).Google Scholar
- 7.J. R. Bowler, L. D. Sabbagh and H. A. Sabbagh, To be published.Google Scholar