Eddy current test method with degree of amplification selected i

Details Eddy current test method with degree of amplification selected i Eddy current test method with degree of amplification selected i

1982-06-22

1986-01-14

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324232, 324233, 324240, G01N 2790, G01R 3312

Patent

active

045648093

ABSTRACT:
A method and an instrument for testing materials using the eddy current principle, at different frequencies depending on the output quantity of a coil system, compensation values are generated being typical of interfering factors. These compensation values are subsequently superposed on the output values in order to remove the influence of the interfering factors on the measuring. In this manner with a favorable setting of the working point of an amplifier charged with the output values, an overmodulation is avoided and the dynamic range of the amplifier optimally utilized. Therefore good measuring results can be obtained even if the percentage of the interfering signals as compared to the signal controlling the detecting of defects, is relatively high.

REFERENCES:
patent: 4237419 (1980-12-01), Tornblom et al.
patent: 4303885 (1981-12-01), Davis et al.
patent: 4322683 (1982-03-01), Vieira et al.
patent: 4326166 (1982-04-01), Pigeon et al.
patent: 4331920 (1982-05-01), Kalisch et al.

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