Ferromagnetic resonance probe and method for flaw testing in metals
US4286216A · kind A · utility
16Cited by
13References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1978 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Nov 15, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.