Non-destructive eddy current test device using additive flux sub

Details Non-destructive eddy current test device using additive flux sub Non-destructive eddy current test device using additive flux sub

1991-12-12

1993-02-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324232, 324233, G01N 2790, G01R 3312

Patent

active

051840715

ABSTRACT:
A non-destructive eddy current test device using additive flux/substractive flux switching includes a generator supplying a sinusoidal signal, two power amplifiers of equal and opposite gain, a changeover relay, two impedances and two coils forming a Wheatstone bridge, an amplifier controlled by a binary signal to add or subtract and two synchronous detectors for supplying signals representing the real part and the imaginary part of the difference between the complex impedances of the coils. A control device supplies to the changeover relay and to the amplifier a control signal for obtaining additive or subtractive fluxes in the two coils and for respectively subtracting or adding the two output voltages of the Wheatstone bridge. The device is applicable to the non-destructive testing of metal parts.

REFERENCES:
patent: 3609531 (1971-09-01), Forster
patent: 3701941 (1972-10-01), Bantz et al.
patent: 3866116 (1975-02-01), Strauts et al.
patent: 5068608 (1991-11-01), Clark, Jr.

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