Digitally controlled multifrequency eddy current test apparatus and method
US4303885A · kind A · utility
92Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1979 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Jun 18, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Digitally controlled eddy current test apparatus for detecting flaws, their extent and location. The apparatus provides absolute and differential measurements. The apparatus employs multi-frequencies with the signals from the test coils mixed in a predetermined manner to reduce unwanted signals such as may be introduced by wobble (lift-off) and support plates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.