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- W1970534061 abstract "We have field-tested an apparatus for measuring the electromagnetic impedance above the ground at several frequencies in the [Formula: see text] range. This window in the frequency spectrum, which lies between frequencies used for GPR and those used for conventional loop-loop EM soundings, has not been used because of difficulties in fielding equipment for making absolute and accurate measurements. Model and physical parameter studies however confirm that data in this frequency band can be used to construct high-resolution maps of electrical conductivity and permittivity of near-surface material. Our equipment was assembled using commercial electric and magnetic antennas. The magnetic loop source is excited by a conventional signal generator—power amplifier assembly. Signal detection is accomplished using RF lock-in amplifiers. All system elements are appropriately isolated by optical fiber links. We estimate a measurement accuracy of about [Formula: see text] for an [Formula: see text] separation between source and detector. Field tests were done at the University of California Richmond Field Station where the near surface electrical structure is well known. The experimental data at this site are mainly a function of electrical conductivity. In this context, we have obtained good agreement with the known local variations in resistivity both with depth and with position along a [Formula: see text] traverse. Additional tests in more resistive regimes where dielectric permittivity is not negligible yield spectral data compatible with the less well known near-surface electrical properties." @default.
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- W1970534061 date "2004-06-01" @default.
- W1970534061 modified "2023-09-27" @default.
- W1970534061 title "High-Frequency and Very-High-Frequency (HF & VHF) Above-Ground Electromagnetic Impedance Measurements" @default.
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- W1970534061 doi "https://doi.org/10.4133/jeeg9.2.87" @default.
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