White's Electronics, Inc.

Carl Moreland

Anne E Kelley

John W Plautz

John L Earle

Brian Hupy

Eric Foster

Jeffrey L Kelley

Jeff Kelley

Robert M Canaday

This invention relates to a metal detector where a coil is used to transmit a periodic magnetic field to energize metal objects that are concealed and often buried or hidden in a matrix (ground) containing ferromagnetic minerals. There are many difficult and often simultaneous challenges, such as detecting large deep targets, detecting minutely small targets, identifying target properties, ignoring the ferromagnetic matrix, avoiding a net magnetic field which can trigger magnetic sensors in land mines, and ignoring conductive salt responses. Either time-domain or frequency domain methods have been used to address these challenges with mixed levels of success. The ability to simultaneously use time-domain and frequency-domain methods can expand detection capability. Techniques are presented for achieving these goals.

Truncated half-sine methods for metal detectors

A metal detector has a motion sensor such as an accelerometer to determine direction, speed, duration and acceleration of search loop motion. The search loop motion information from the motion sensor is utilized in mode selection, signal processing, target analysis, and information display.

Metal detector with motion sensing

This invention provides a pulse induction metal detector where a coil transmits a pulsed magnetic field to energize metal objects that are often buried or hidden in a matrix (ground) containing ferromagnetic minerals. A difficult challenge is to detect and identify the metal object while ignoring the ferromagnetic matrix. Techniques are presented for achieving this.

Time domain method and apparatus for metal detectors

Metal detectors use graphical displays offering many analysis methods and user options which were not possible before. The new graphical detector displays allow new ways to display target information that enable better methods of analyzing and viewing target data. Graphical detectors have menu structures with dozens of operating parameters which can be modified by the user. Some of these parameters are able to be changed on-the-fly without having to suspend detector operation.

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Corvallis, OR, United States of America

Carl Moreland