Circuit and method of providing a stable display for eddy current instruments
US9726640B2 · kind B2 · utility
0Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2014 |
| Grant date | Aug 8, 2017 |
| Priority date | — |
| Expiry date | Sep 3, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotary bolt hole eddy current inspection scanner using a differential eddy current probe, the circuitry of the scanner is embodied with a filtering circuit with three filters: FIR (Finite Impulse Response), a low pass filter, and a phase control filter (by means of a Hilbert transform). The result from a scan of a bolt hole is an output signal on an impedance plane exhibiting a “backwards 6” shape of stable size when the scanner changes its rotating rate significantly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.