Automatic impedance matching for EMAT
US12184258B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2022 |
| Grant date | Dec 31, 2024 |
| Priority date | — |
| Expiry date | Jul 13, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0234
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An automatic impedance matching system that reads the input impedance of an electromagnetic acoustic transducer (EMAT) electrical circuit and automatically select appropriate input impedance matching by combining components from a built-in selection of a matching circuitry. A Vector Network Analyzer or similar impedance measuring circuit is connected to the EMAT electrical circuit to measure the input impedance of the EMAT electrical circuit comprising an RF coil, coil cable, and conductive material to be inspected at a given material lift-off, and to relay measurement information to the system processor. The processor uses this information to adjust the overall input impedance of the EMAT electrical circuitry by selecting appropriate components such as capacitors and transformer taps of the built-in selection of the matching circuitry connected between the system pulser/receiver and the coil cable. As such, the overall impedance of the EMAT electrical circuit can be adjusted to best match a desired impedance that would optimize performance of the EMAT which is based on a measured acoustic signal transmission coefficient or a measured acoustic signal reflection coefficient of the E…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.