Electromagnetic acoustic transducer
US10537916B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2015 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Feb 10, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0422
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic acoustic transducer includes a flux guide surrounded by one or more permanent magnets abutting side faces of the flux guide. The magnetic field from the permanent magnets enters the flux guide where repulsion between the magnetic fields directs at least a portion of the magnetic fields toward a test face abutting a test object. The flux density at the test face is greater than the flux density within the originating permanent magnets. An active portion of a coil disposed between the flux guide and the test object contains conductors that are substantially straight, parallel and carry current in the same direction in order to provide substantially mode pure and uni-directionally polarised excitation of shear waves within the test object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.