公开(公告)号：US20240146278A1

公开(公告)日：2024-05-02

申请号：US17976539

申请日：2022-10-28

Applicant: Borja Lopez Jauregui ,  Philip Haywood Cox ,  Nathaniel Quinn Huggins

Inventor： Borja Lopez Jauregui ,  Philip Haywood Cox ,  Nathaniel Quinn Huggins

IPC: H03H7/38 ,  G01N29/04 ,  G01N29/24

CPC classification number: H03H7/38 ,  G01N29/04 ,  G01N29/2412 ,  G01N2291/0234

Abstract: An automatic impedance matching system that can read the input impedance of an EMAT electrical circuit and automatically select the appropriate impedance matching by combining components from a built-in selection of matching circuitry. A Vector Network Analyzer or similar impedance measuring circuit is connected to the EMAT electrical circuit and measures the impedance of the EMAT RF coil, coil cable, and conductive material to be inspected at a given material lift-off, and relies on the information to the system processor. The processor uses this information to adjust the overall impedance by selecting appropriate capacitors and transformer taps on a programmable impedance matching circuit connected between the system pulser/receiver and the RF coil cable. The system can work in either pulse-echo (same transmitter and receiver) or pitch-catch (different transmitter and receiver).

公开(公告)号：US12184258B2

公开(公告)日：2024-12-31

申请号：US17976539

申请日：2022-10-28

Applicant: Borja Lopez Jauregui ,  Philip Haywood Cox ,  Nathaniel Quinn Huggins

Inventor： Borja Lopez Jauregui ,  Philip Haywood Cox ,  Nathaniel Quinn Huggins

IPC: H03H7/38 ,  G01N29/04 ,  G01N29/24

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 EMAT. The system can work in either pulse-echo (same transmitter and receiver) or pitch-catch (different transmitter and receiver).