Device for suppression and/or separation of signals due to magne

Details Device for suppression and/or separation of signals due to magne Device for suppression and/or separation of signals due to magne

1988-01-20

1989-06-06

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324232, 324239, G01N 2772, G01R 3312

Patent

active

048375101

ABSTRACT:
Defect detecting equipment includes a device which detects the presence of, for example, disturbing magnetic material such as cold oxide scales in a test object, in order thus to control, for example, that disturbances of a magnetic origin are not confused with surface cracks without being discovered. By utilizing eddy current techniques, phenomena which are harmless to the process can be separated from dangerous surface cracks, thus avoiding the scrapping of crack-free test objects. The invention is based on signal-processing at least two signals, for example H1 and L1, originating from a test object sensing tansducer, by means of a vector transformation method, and distinguished between harmful and harmless phenomena (e.g. cracks and oxide scales) as a function of a comparison of signals, S1 and S2l , from at least two transformation blocks.

REFERENCES:
patent: 4274054 (1981-06-01), Savidge et al.

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