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First Texas Products, LLC

David Eugene Johnson

Ross Edward Spain

A pulse induction metal detector with a quasi-resonant transmitter and associated method is provided. The metal detector may be of the type such as is typically moved over the ground surface for the purpose of detecting buried metal objects. The quasi-resonant transmitter may include circuit apparatus to capture and recycle flyback energy and to transmit a pulsed magnetic field for energizing metal object to be detected.

Pulse induction metal detector with quasi-resonant transmitter and associated method

A buried utility locator uses the 'gradient method' to determine the depth of a buried, current-carrying utility. The method and corresponding apparatus used in said locator, to minimize field gradient measurement errors, includes first and second antennas. Both the first and second antennas are mounted along a common vertical axis inside the locator's housing. The first antenna is a gradiometer formed by two vertically spaced-apart magnetic field sensors connected in a differential configuration. The second antenna provides a secondary field measurement along the direction of the gradient sensor axes.

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El Paso, TX, United States of America

David Eugene Johnson