EMAT probe and technique for weld inspection
US5760307A · kind A · utility
Inventors
Key dates
| Filing date | Sep 7, 1995 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Sep 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/267
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus of inspecting for flaws in a specular reflector, where the flaws having an expected length and the reflector is electrically conductive. The method includes directing a beam of an electromagnetic acoustic transmitting transducer along a beam axis toward the specular reflector for producing a reflected electromagnetic acoustic beam. The transmitted beam has side lobes with zero points therebetween, at least some of the side lobes being major side lobes. The reflected beam is received using an electromagnetic acoustic receiving transmitter set at an angle to the beam axis, the angle being selected to be at one of the zero points and past all of the major lobes of the transmitted beam to eliminate root and crown signals of the weld, in the reflected signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.