Control apparatus for eddy current non-destructive testing using

Details Control apparatus for eddy current non-destructive testing using Control apparatus for eddy current non-destructive testing using

1980-03-03

1982-03-30

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324233, 324240, G01R 3312, G01N 2790

Patent

active

043226833

ABSTRACT:
Digital apparatus for controlling members by eddy currents comprising a sensor constituted by a primary winding and a secondary winding, an exciting sinusoidal voltage generator, a correcting circuit for eliminating the residual voltage supply by the secondary winding of the sensor, a circuit for analyzing the corrected measuring voltage incorporating two samplers and a means for displaying the two signals supplied by the two samplers. The exciting voltage generator is of the digital type and comprises an oscillator, a counter, a memory and a digital-analog converter. The collection circuit comprises a number selection means, a comparator, a counter, a memory and a digital-analog converter. The means for generating control pulses for the samplers comprises a number selection means, a comparator and a digital phase shifter.
A particular application is in the field of non-destructive testing.

REFERENCES:
patent: 3229198 (1966-01-01), Libby
patent: 3337796 (1967-08-01), Hentschel et al.
patent: 4059795 (1977-11-01), Mordwinkin
patent: 4084136 (1978-04-01), Libby et al.
patent: 4207520 (1980-06-01), Flora et al.
patent: 4230987 (1980-10-01), Mordwinkin

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