Multi-sensor system for the detection and characterization of unexploded ordnance

US7999550B2 · kind B2 · utility

Assignee

• The Regents of the University of California · US

Inventors

• Frank Morrison · Berkeley, US
• Erika Gasperikova · Berkeley, US

Key dates

• Filing date: Sep 25, 2008
• Grant date: Aug 16, 2011
• Expiry date: Nov 28, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/104
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To fully characterize the inductive response of an isolated conductive object, such as buried unexploded ordinance, one needs to measure its response to stimulation by primary magnetic fields in three linearly independent (e.g., approximately orthogonal) directions. In one embodiment this is achieved by measuring the response to magnetic fields of three independent transmitters arranged to have magnetic fields that are linearly independent. According to the apparatus and methods employing the system of this invention, multiple transmitters and receivers of known relative position and orientation on a single platform are used. In a preferred embodiment, matched sets of receiver pairs connected in gradient mode are positioned adjacent to closely spaced pairs of transmitting coils, such that a minor displacement of one or both of the receiver coil pairs relative to the paired transmitting coils will not affect the detected secondary signals emitted by a buried metallic object.