Electro-magnetic acoustic transducer (EMAT) having electromagnet array for generating configurable bias magnetic field patterns
US11561205B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2020 |
| Grant date | Jan 24, 2023 |
| Priority date | — |
| Expiry date | Dec 14, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/106
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electro-magnetic acoustic transducer (EMAT) having an electromagnet array is provided. The electromagnet array includes electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently. For instance, the electromagnet array generates a bias magnetic field having a given pattern, for the EMAT to transmit a first type of ultrasonic wave such as shear-horizontal wave, when the wound coils are energized in a given manner; and generates a bias magnetic field having a different pattern, for the EMAT to transmit a second type of ultrasonic wave such as a Lamb wave, when the wound coils are energized in a different manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.