Detection of corrosion fatigue in boiler tubes using a spike EMAT pulser
US6125703A · kind A · utility
55Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Jun 26, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of detecting damage in a ferromagnetic workpiece such as a boiler tube positions a pair of EMAT coils adjacent to the workpiece at a non-zero angle with respect to one another. A spike pulse is applied to one of the EMAT coils for generating a horizontally polarized shear wave in the workpiece which is capable of being reflected by a flaw, and the amplitude of a reflected wave from any flaw is received at the other EMAT coil and analyzed and compared to a predetermined percent of an amplitude of a calibration standard flaw to establish the presence of the flaw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.