Eddy current apparatus including cylindrical coil with flux concentrator for high resolution detection of flaws in conductive objects
US4806863A · kind A · utility
18Cited by
15References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1986 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Oct 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for testing for flaws in conductive objects which includes a coil of electrically conducting wire and an associated flux concentrator of electromagnetically active material which is disposed radially from the coil, sized and shaped to provide a desired resolution of flaw detection and provides close coupling between the coil and conductive object. An associated bridge circuit detects changes in the coil's impedance, caused by flaws in the object, and activates a display to visually indicate a change in impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.