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An Electromagnetic Noncontacting Sensor for Thickness Measurement in a Dispersive Media

By Chufo, Robert L.

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Book Id: WPLBN0000083143
Format Type: PDF eBook
File Size: 0.2 MB
Reproduction Date: 2005
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Title: An Electromagnetic Noncontacting Sensor for Thickness Measurement in a Dispersive Media  
Author: Chufo, Robert L.
Language: English
Subject: Health., Medical research, Medical reports
Collection: Medical Library Collection
Publication Date:
Publisher: Centers for Disease Control and Prevention

This 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.

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