Method and apparatus for suppressing noise during nondestructive

Details Method and apparatus for suppressing noise during nondestructive Method and apparatus for suppressing noise during nondestructive

1980-05-15

1983-01-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

307520, 324220, 324233, 328165, G01N 2790, G01R 3312, H04B 1500

Patent

active

043684297

ABSTRACT:
A filter apparatus (2) is disclosed for filtering out any reoccurring noise (5) present in a defect signal (1) received from a flaw detection device (4) such as an eddy current test probe. Filter circuit means (10) receives the defect signal generated by the flaw detector device and produces an output signal (5) duplicative of any reoccurring noise present therein. A differential amplifier (50) subtracts the output signal (5) of the filter circuit means from the defect signal (1) generated by the flaw detection device and amplifies the difference. A filtered defect signal (9) void of any reoccurring noise is thereby produced.

REFERENCES:
patent: 3375451 (1968-03-01), Borelli et al.
patent: 3526842 (1970-09-01), Andrew
patent: 3961172 (1976-06-01), Hutcheon
patent: 4004239 (1977-01-01), Clarke
patent: 4027264 (1977-05-01), Gutleber
patent: 4037095 (1977-07-01), Howells et al.
patent: 4061968 (1977-12-01), Pigeon
patent: 4215310 (1980-07-01), Schwerer
patent: 4274054 (1981-06-01), Savidge et al.

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