Non-destructive eddy current testing device with signal compensa

Details Non-destructive eddy current testing device with signal compensa Non-destructive eddy current testing device with signal compensa

1991-12-12

1992-12-15

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324232, 324233, 324238, G01N 2790, G01R 3312

Patent

active

051720582

ABSTRACT:
An embodiment comprises a generator constituted by a quartz crystal oscillator and programmable frequency dividers; a power amplifier providing a periodic excitation signal, of squarewave form; two coils electromagnetically coupled to a metal part to be tested; and measuring means comprising two synchronous detectors for measuring the real part and the imaginary part of the difference between the complex impedances of the coils. The frequency stability of the generator effects an improvement in the accuracy of the impedance measurements, when these measurements are made at different frequencies. For application to non-destructive testing of metal parts by eddy currents, at different frequencies.

REFERENCES:
patent: 3443212 (1969-05-01), Renken
patent: 4059795 (1977-11-01), Mordwinken
patent: 4084136 (1978-04-01), Libby et al.
patent: 4230987 (1980-10-01), Mordwinken
patent: 4424486 (1984-01-01), Denton et al.
WPIL/DERWENT, accession No. 89-363176 [49], Derwent Publications Ltd., Londres, GB; & SU-A-1 464 067 (V. I. Krapivin).
Patent Abstracts of Japan, vol. 9, No. 127 (P-360)[1850], May 31, 1985; & JP-A-60 11 158 (Nippon Kokan), Jan. 21, 1985.
WPIL/DERWENT, accession No. 85-036559 [06], Derwent Publications Ltd., Londres, GB; & SU-A-1 099 269 (V. I. Redko).

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