INVERSE MODELING OF MULTIFREQUENCY INDUCTION ELECTROMAGNETIC DATA

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 25851
Amount: $735,252.00
Phase: Phase II
Program: SBIR
Awards Year: 1995
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Geophex, Ltd.
605 Mercury Street, Raleigh, NC, 27603
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 David W.a. Taylor, Phd
 (919) 839-8515
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE RECENT ADVENT OF A DIGITAL, BROADHAND, HAND-HELD ELECTROMAGNETIC (EM) SENSOR PROVIDES AN OPPURTUNITY FOR A SIGNIFICANT ADVANCE IN RAPID AND MEANINGFUL SITE CHARACTERIZATION FOR DEPTH RANGES AND CONDITIONS WHERE GROUND PENETRATING RADAR (GPR) IS INEFFECTIVE. THIS PROPOSAL PRESENTS A FEASIBILITY STUDY TO INVERT WIDEBAND INDUCTION EM DATA TO IMAGE SUBSURFACE FEATURES. ULIKE OTHER TECHNIQUES SUCH AS GPR, LOW FREQUENCY EM TECHNIQUES ARE SENSITIVE TO DEEPER STRUCTURES DUE TO THE GREATER SKIN DEPTH OF THE LONGER WAVELENGTH SIGNALS. THE ISSUE THIS PROPOSAL ADDRESSES IS TO INVERT THE EM DATA TO CONSTRUCT A TWO-DIMENSIONAL ELECTRICAL CONDUCTIVITY VS. DEPTH MODEL. DATA COLLECTION COULD BE ACCOMPLISHED BY A SINGLE OPERATOR, WITHOUT THE INSTRUMENT TOUCHING THE GROUND, AND SIGNAL PROCESSING COULD BE COMPLETED AUTOMATICALLY IN REAL-TIME. ELECTRICAL CONDUCTIVITY ANOMALIES, SUCH AS DUE TO FLUID-FILLED PORES OR FRACTURES, COULD THEN BE EASILY INTERPRETED IN THE FIELD.

* information listed above is at the time of submission.

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