A Wide-Band Electromagnetic Impedance Profiling System for Non-Invasive Subsurface Characterization

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A non-invasive, wide-band electromagnetic (EM) impedance difference system for shallow subsurface electrical structure characterization in environmental and engineering problems has been developed at the Lawrence Berkeley National Laboratory (LBNL). Electrical parameters of interest are electrical conductivity and dielectric permittivity that are deduced from the impedance difference data. The prototype system includes a magnetic loop transmitter, which operates between 0.1 MHz and 100 MHz, an electrical dipole antenna for observing the electric field, and a loop antenna for measuring the magnetic field.All antennas are mounted on a cart made of non-metallic material for easy movement of the whole array for profiling. ... continued below

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Tseng, Hung-Wen; Lee, Ki Ha & Becker, Alex December 17, 2004.

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A non-invasive, wide-band electromagnetic (EM) impedance difference system for shallow subsurface electrical structure characterization in environmental and engineering problems has been developed at the Lawrence Berkeley National Laboratory (LBNL). Electrical parameters of interest are electrical conductivity and dielectric permittivity that are deduced from the impedance difference data. The prototype system includes a magnetic loop transmitter, which operates between 0.1 MHz and 100 MHz, an electrical dipole antenna for observing the electric field, and a loop antenna for measuring the magnetic field.All antennas are mounted on a cart made of non-metallic material for easy movement of the whole array for profiling. Surface EM impedance difference is obtained by taking the difference of the ratios of the electric fields to the magnetic fields at selected frequencies at two different levels. Numerical simulations will be presented to verify this new approach. A set of the impedance difference data acquired at the University of California's Richmond Field Station compares reasonably well with simulation results based on a model obtained with the resistivity method and in situ TDR (time domain reflectometry)measurements.

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  • Symposium on the Application of Geophysics toEngineering and Environmental Problems, Atlanta, Georgia, April 3-7,2005

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  • Report No.: LBNL--56762
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 862011
  • Archival Resource Key: ark:/67531/metadc792781

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 17, 2004

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  • Dec. 19, 2015, 7:14 p.m.

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  • Sept. 21, 2017, 3:38 p.m.

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Tseng, Hung-Wen; Lee, Ki Ha & Becker, Alex. A Wide-Band Electromagnetic Impedance Profiling System for Non-Invasive Subsurface Characterization, article, December 17, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc792781/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.