Ferromagnetic resonance probe and method for flaw testing in met

Details Ferromagnetic resonance probe and method for flaw testing in met Ferromagnetic resonance probe and method for flaw testing in met

1978-11-15

1981-08-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324235, 324300, G01R 3312

Patent

active

042862167

ABSTRACT:
A probe and method for detecting surface flaws in metals. The probe operates at microwave frequencies and uses a ferromagnetic resonator. The resonator experiences a frequency shift when brought into proximity with a metal because of the perturbations of the demagnetizing fields at the boundaries of the resonator. A crack in the metal additionally disturbs the field and causes additional perturbations of the frequency. The perturbations in frequency are detected to provide an indication of flaws in the surface of the metal.

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Auld, B. A., Theory of Ferromagnetic Resonance Probes for Surface Cracks in Metals, G.L. Report No. 2839, Jul. 1978, pp. 1-51, contract (CMR) NSF DMR 76-00726.

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