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Mining Publication: An Electromagnetic Noncontacting Sensor for Thickness Measurement in a Dispersive Media
Keywords: Ground penetrating radar
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: March 1994
Authors: RL Chufo
Conference Paper - March 1994
Download PDF Document (0.14 MB)
NIOSHTIC2 Number: 20023292
Proc AIAA/NASA Conference on Intelligent Robots in Field, Factory, Service, and Space (CIFFSS 94) 1994 Mar 21-24 Jon D. Erickson, Houston, TX 1:190-194
his paper describes a general purpose imaging technology developed by the U.S. Bureau of Mines (USBM) that, when fully implemented, will solve the general problem of "seeing into the earth." A first generation radar coal thickness sensor, the RCTS-1, has been developed and field-tested in both underground and highwall mines. The noncontacting electromagnetic technique uses spatial modulation created by moving a simple sensor antenna in a direction along each axes to be measured while the complex reflection coefficient is measured at multiple frequencies over a two-to-one bandwidth. The antenna motion imparts spatial modulation to the data that enables signal processing to solve the problems of media, target and antenna dispersion. Knowledge of the dielectric constant of the media is not necessary because the electrical properties of the media are determined automatically along with the distance to the target and thickness of each layer of the target. The sensor was developed as a navigation guidance sensor to accurately detect the coal/noncoal interface required for the USBM computer-assisted mining machine program. Other mining applications include the location of rock fractures, water-filled voids, and abandoned gas wells. These hazards can be detected in advance of the mining operation. This initiating technology is being expanded into a full three-dimensional (3-D) imaging system that will have applications in both the underground and surface environment.
Image of publication An Electromagnetic Noncontacting Sensor for Thickness Measurement in a Dispersive MediaConference Paper - March 1994
Download PDF Document (0.14 MB)
NIOSHTIC2 Number: 20023292
Proc AIAA/NASA Conference on Intelligent Robots in Field, Factory, Service, and Space (CIFFSS 94) 1994 Mar 21-24 Jon D. Erickson, Houston, TX 1:190-194
See Also
Application of Ground Penetrating Radar to Evaluate the Extent of Polyurethane Grout Infiltration for Mine Roof Control: A Case Study
Assessment of Ground Conditions Near a Mine Portal Using Ground Penetrating Radar
Delineation of Fractures in Igneous Rock Masses Using Common Offset Radar Reflection
An Electromagnetic Spatial/Spectral Sensor for Geological Measurements
Evaluation of Mine Seals Using Ground Penetrating Radar
A Radar-based Highwall Rib-Thickness Monitoring System
Recent National Institute for Occupational Safety and Health Research Using Ground Penetrating Radar for Detection of Mine Voids
Technology News 462 - Ground Penetrating Radar for Highwall Guidance
Use of Ground Penetrating Radar and Schmidt Hammer Tests to Determine the Structural Integrity of a Mine Seal
Using Ground Penetrating Radar for Roof Hazard Detection in Underground Mines
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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