Method and apparatus for eddy curent non-destructive examination of cylindrical metallic members
US5119023A · kind A · utility
13Cited by
3References
6Claims
0Family size
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Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/904
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for non-destructively examining cylindrical material by electromagnetic induction use primary coils separated by an annular gap. The primary coils are excited oppositely so that the respective magnetic fields thereby generated are in boosting relationship in the gap. Close electromagnetic coupling of the primary coils with the material under examination is effected, and detectors, such as secondary coils are disposed in the gap to detect flux perturbations caused by variation in the properties of the material under examination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.