Combined electromagnetic acoustic transducer (EMAT) and electro permanent magnets (EPMS) for bias field control
US10408796B2 · kind B2 · utility
3Cited by
3References
24Claims
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Key dates
| Filing date | Apr 14, 2017 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | Aug 17, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods for non-destructive testing of specimens are disclosed herein. In one embodiment, an electromagnetic acoustic transducer (EMAT) includes an electro-permanent magnet (EPM) configured to controllably apply a biasing magnetic flux to a target location. The EPM includes a hard magnet, and a soft magnet at least partially enclosing the hard magnet. The EPM also includes a magnetizing coil having a plurality of turns at least partially encircling the soft magnet. The magnetizing coil is configured to controllably magnetically bias the soft magnet when a current is applied to the magnetizing coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.