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23 May 2011 Coaxial line measurement and analysis of electromagnetic properties of soils for sensor applications
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Abstract
We report complex permittivity, conductivity, magnetic susceptibility, and attenuation for soils collected from a typical site in a current theater of operations. Our experimental setup consists of three network analyzers along with custombuilt sample holders and data reduction and analysis software. The sample holder has the advantage of large sample volume and a resulting higher signal to noise ratio. This system was developed to determine the electrical properties of soils over a wide frequency range from 100 Hz to 8 GHz. The lower frequencies are applicable to capacitive sensors for small shallow targets, while the higher frequencies are applicable to ground-penetrating radar (GPR) from 50 MHz to 2 GHz and beyond. S-parameter data is collected and reduced using a method, initially developed by Nicolson and Ross (1970)1, for the determination of dielectric permittivity, magnetic permeability, and loss tangent from measured Sparameter data. Experimental results are compared with site geology and mineralogy. Applications include detection of tunnels, land mines, unexploded ordinance (UXO), concrete reinforcements, and other shallow compact targets.
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William R. Folks, Ryan E. North, Julie R. Kelley, Amy L. Cunningham, and Jason R. McKenna "Coaxial line measurement and analysis of electromagnetic properties of soils for sensor applications", Proc. SPIE 8017, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVI, 80170W (23 May 2011); https://doi.org/10.1117/12.883676
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