Calibration of eddy current profilometry
US4942545A · kind A · utility
79Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1988 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Jun 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9086
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Calibration of an eddy current probe (24) and associated data acquisition and analysis system (42, 48, 52, 54, 66) is accomplished using a step tube sample (68) having a nominal diameter portion (74) substantially equivalent to a nominal field tube (22). Two readings of eddy current test units are obtained from the step tube sample, and the diameter of the probe is used as a boundary condition on the non-linear response of the probe to variations in tube radius. A calibration curve is generated for use in converting field tube eddy current measurements to field tube radius or profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.