Ferromagnetic resonance probe liftoff suppression apparatus

Details Ferromagnetic resonance probe liftoff suppression apparatus Ferromagnetic resonance probe liftoff suppression apparatus

1982-11-23

1985-07-09

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324227, 324237, 324240, G01N 2782, G01R 3312

Patent

active

045285063

ABSTRACT:
A liftoff suppression apparatus utilizing a liftoff sensing coil to sense the amount a ferromagnetic resonance probe lifts off the test surface during flaw detection and utilizing the liftoff signal to modulate the probe's field modulating coil to suppress the liftoff effects.

REFERENCES:
patent: 3197693 (1965-07-01), Libby
patent: 4215310 (1980-07-01), Schwerer
patent: 4286216 (1981-08-01), Auld et al.
patent: 4290017 (1981-09-01), Fortunko
patent: 4340861 (1982-07-01), Sparks
patent: 4364012 (1982-12-01), Auld
patent: 4383218 (1983-05-01), Hansen et al.
patent: 4424486 (1984-01-01), Denton et al.

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