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Cross‐hole radar attenuation tomography using a frequency centroid down‐shift method: Consideration of non‐linear frequency dependence of EM wave attenuation

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Abstract

This paper presents a cross-hole radar attenuation tomography method based on analysis of the down-shift in the spectrum centroid frequency, and spectral broadening of the received radar signals. The method uses a parameter that combines centroid frequency down shift and variance increase for the projection function to construct the tomography algorithm. In comparison with other methods for estimating attenuation, the frequency down shift method is relatively insensitive to the effects of geometric spreading, antenna coupling, antenna radiation pattern,and instrument response, but the method requires the data to be broad-band so the frequency shift is easily measured. This method is well suited for difference tomography when electrically conductive tracers are used. The method was tested using cross-hole radar data acquired before and during a saline tracer injection experiment at the U.S.Geological Survey’s Fractured Rock Research Site at Mirror Lake, in Grafton County, New Hampshire. The attenuation-difference tomogram clearly outlines the location of the saline tracer within the tomography plane.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Cross‐hole radar attenuation tomography using a frequency centroid down‐shift method: Consideration of non‐linear frequency dependence of EM wave attenuation
Year Published 1997
Language English
Publisher Society of Exploration Geophysicists
Contributing office(s) Office of Ground Water
Description 4 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title SEG technical program expanded abstracts
First page 442
Last page 445
Conference Title Society of Exploration Geophysicists International Exposition and Sixty-Seventh Annual Meeting,
Conference Location Dallas, TX
Conference Date November 2-7, 1997
Country United States
State New Hampshire
County Grafton County
Other Geospatial Mirror Lake
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