Innerspec Technologies, Inc

Other

Philip Haywood Cox

Stephen William Smith

Borja Lopez Jauregui

Nathaniel Quinn Huggins

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).

Automatic impedance matching for EMAT

A high-voltage pulser circuit for Electromagnetic Acoustic Transducer (EMAT) coils using a Capacitive Discharge push-pull converter. The present invention relates in particular to the operation of the converter into an Electromagnetic Acoustic Transducer (EMAT) differential coil. The present invention reduces ringing of the coil current resulting in a smaller blind zone and a well-defined broadband ultrasonic wave from the coil. The pulser can be used to generate one or more cycles and work in either pulse-echo (same transmitter and receiver) or pitch-catch (different transmitter and receiver).

Capacitive discharge push-pull converter pulser for electromagnetic acoustic transducer

An improved book holding device is disclosed that enables a user to carry a plurality of books as well as related articles such as electronic devices, calculators, cell phones, electronic organizers, PDAs, digital music players and the like. The apparatus features an 'x' shaped sheeted material having elongated straps. One of the straps carries a larger pouch that has a length that is about equal to or greater than the half of the length of its strap. Smaller pouches can be provided for holding smaller articles.

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Madison Heights, VA, United States of America

Philip Haywood Cox