Multiple frequency digital eddy current inspection system
US4207520A · kind A · utility
86Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Apr 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for inspecting for cracks under installed fasteners and the like using a multiple frequency digital eddy current system. A computer with a plurality of digital arrays generate drive signals which are converted to analog and applied to the test coil, a second set of digital arrays generate balance signals, are adjusted in amplitude and phase and drive signals so that the output of the test coil is zero in a test specimen, output signals from a work piece are processed in the computer giving phase-sensitive crack detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.