David E Johnson

Title: Innovations by David E Johnson

Introduction

David E Johnson is an accomplished inventor based in Los Banos, California. He has made significant contributions to the field of geophysical apparatus and metal detection technology. With a total of 3 patents to his name, Johnson's work has advanced the methods used to locate metal objects and minerals.

Latest Patents

One of Johnson's latest patents is an apparatus and method for locating metal objects and minerals. This invention includes an eddy current type metal detector designed to distinguish between different classes of metal objects. The device utilizes a nonsinusoidal transmit voltage to energize a transmit coil, which generates a nonsinusoidal alternating magnetic field. This field penetrates the soil, rocks, or metal objects, and the distortion caused by these materials induces corresponding voltage waveforms in a receive coil. The analysis of these induced waveforms allows for the deduction of certain electrical properties of the materials, enabling the distinction of buried metal objects from the surrounding soil. Additionally, the circuit that energizes the transmit coil efficiently returns energy from the collapse of the magnetic field to the power supply, minimizing power consumption.

Another notable invention is a metal detector and classifier with automatic compensation for soil. This device is designed to locate and classify metal objects of various types in the ground or other environments. It features automatic compensation for signals produced by magnetic materials in the soil and addresses misalignment issues of the coils in the sensing head.

Career Highlights

Throughout his career, David E Johnson has worked with several companies, including Frl, Inc. and Flr, Inc. His innovative contributions have played a crucial role in enhancing the capabilities of metal detection technology.

Collaborations

Johnson has collaborated with various professionals in his field, including his coworker Richard Williams. Their joint efforts have furthered the development of advanced detection technologies.

Conclusion

David E Johnson's inventions have significantly impacted the field of metal detection and geophysical measurements. His innovative approaches continue to influence the industry and pave the way for future advancements.