Accession Number : ADA325662

Title :   Basic Research on Three-Dimensional (3D) Electromagnetic (EM) Methods for Imaging the Flow of Organic Fluids in the Subsurface.

Descriptive Note : Final rept. 1994-1997,

Corporate Author : ARIZONA UNIV TUCSON

Personal Author(s) : Sternberg, Ben K. ; Dvorak, Steven L.

PDF Url : ADA325662

Report Date : 30 APR 1997

Pagination or Media Count : 131

Abstract : Currently there are no systems available which allow for economical and accurate subsurface imaging of remediation sites. In some cases, high frequency ground penetrating radar (GPR) has been shown to be capable of accurately mapping the movement of contaminant plumes. Unfortunately, high frequency GPR has much too limited a depth of penetration in many soils to be useful for a large number of environmental problems. Lower frequencies are needed in order to obtain a reasonable depth of penetration. During this project, we conducted research on a prototype 8 MHz null field electromagnetic (EM) system to address this need. This project has been very successful in showing a promising new direction for high resolution subsurface imaging. Our tests with a prototype Electromagnetic Sensitive Null Array Probe (EM-SNAP) showed that we were able to obtain very sensitive measurements over subsurface dielectric targets. Although more basic research must be done, this approach holds great promise for imaging the flow of organic fluids in the subsurface.

Descriptors :   *IMAGE PROCESSING, *ELECTROMAGNETIC INDUCTION, *SOIL POLLUTION, HIGH RESOLUTION, ENVIRONMENTAL IMPACT, CONTAMINANTS, NULLS(AMPLITUDE), SOIL DYNAMICS, ENVIRONMENTAL PROTECTION, CROSSTALK, GROUND CLUTTER, OIL SPILLS, UNDERGROUND, UNDERGROUND FACILITIES.

Subject Categories : Active & Passive Radar Detection & Equipment
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE