Dual eddy current probe for detecting geometrical differences especially as related to threaded apertures and studs
US6703831B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2000 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Oct 3, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/904
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for inspecting contours formed along a predetermined region of a surface on a workpiece formed of an electrically conductive material using eddy current. A probe includes a longitudinal axis and is moveable along a path of travel with respect to the predetermined region to be inspected on a workpiece. At least two coils are spaced longitudinally from one another and supported by the probe to be electrically excited with a predetermined frequency and amplitude during movement of the probe along the path. Sensors are provided for measuring the excitation voltage of each coil as eddy currents are induced in the electrically conductive material of the workpiece by the coils supported on the probe moving along the path of travel with respect to the workpiece. A comparison is performed between the measured eddy current signals from the at least two coils, where a non-zero difference after the coils have encountered the predetermined region to be tested represents an end position of the predetermined region formed on the workpiece being tested.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.