Method and apparatus generating and detecting torsional waves for long range inspection of pipes and tubes
US6624628B1 · kind B1 · utility
75Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Sep 9, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus is shown for implementing magnetostrictive sensor techniques for the nondestructive evaluation of ferromagnetic pipes or tubes. A magnetostrictive sensor generates shear waves and/or torsional waves in ferromagnetic pipes or tubes, which waves travel therethrough in a direction parallel to the longitudinal axis of the pipe. A circumferential magnetization is generated in the ferromagnetic pipe or tube by a DC or low frequency voltage establishing a current along the longitudinal axis and past the magnetostrictive sensor. Reflected shear or torsional waves may represent defects in the pipe or tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.