Practical electromagnetic gradiometer

US9568632B2 · kind B2 · utility

Assignee

• Stolar, Inc. · US

Inventors

• Gerald L. Stolarczyk · Raton, US
• Tito Sanchez · Raton, US
• Chance Dain Valentine · Raton, US
• Ernest M. Salazar · Raton, US
• Beaux L. Beard · Raton, US
• John G. Howard · Raton, US
• Brecken H. Uhl · La Mesa, US

Key dates

• Filing date: Sep 4, 2014
• Grant date: Feb 14, 2017
• Expiry date: Jan 11, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/15
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electromagnetic gradiometer (EMG) survey kit includes a lightweight man-carry boom about ten feet long. Matched magnetic dipole antennas are attached at each end and connected to a differential EMG receiver able to make measurements in the picoTelsa range. A pair of staging tripods allow the man-carry boom to be prepared for field use and assist the user in positioning themselves under a shoulder sling. An air core transmitter loop antenna and a low frequency square wave generator are spotted nearby a survey on the ground surface. Its emissions will illuminate any underground conductive structures with primary electric field waves. These in turn will reradiate near field magnetic waves that can be detected by the EMG receiver while walking around in a search area on the ground surface. GPS navigation receivers are used to locate and log the changing positions of the EMG receiver and stationary loop transmitter.