8 June 2011 Complex soil electrical impedivity signatures
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Measurements in dry desert soils have shown significant complex resistivity (or impedivity) variations across the frequency range from 1 kHz to 1 MHz. The impedivity of various soils are measured in-situ in field experiments using a custom apparatus, consisting of a probe head and accompanying custom electronics. Four galvanic electrodes are fixed in the probe head, and arranged in a Wenner array, such that the geometric factor is 1.00 m. In this way, impedance measurements (in Ω) are easily converted to estimates of impedivity (in Ω · m). Field measurements made in-situ are important for obtaining accurate results, because impedance measurements typically change value significantly once soil samples are extracted from their natural environment. These changes are due to changes in the grain boundaries, as well as changes in moisture, temperature, etc. Soil impedivity signatures collected on a variety of soils in the south west region of the USA over the frequency band up to 1 MHz are presented.
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Simon J. Ghionea, Simon J. Ghionea, David M. Hull, David M. Hull, } "Complex soil electrical impedivity signatures", Proc. SPIE 8040, Active and Passive Signatures II, 80400K (8 June 2011); doi: 10.1117/12.882913; https://doi.org/10.1117/12.882913

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