25 March 2005 Terahertz and millimeter wave transmission of soils
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Transmission spectra were measured over the range 90-140 GHz and 300-4200 GHz for 20 soil samples that span a number of soil orders that have extensive worldwide distribution. A vector network analyzer equipped with 16 degree horn antennas covered the spectral range 90-140 GHz. Transmission measurements were also taken for some organic materials in the 90-140 GHz range. A Fourier spectrometer equipped with Hg arc lamp, pellicle beamsplitter, and Si bolometer collected transmission spectra over the range 300 to 4200 GHz. Transmittance ranged from 10-7 to almost 1. In all cases, transmission drops to zero for wavelengths shorter than the characteristic particle size of the sample as a consequence of scattering. In samples of mixed particle size, low transmittance in the 90-140 GHz range was found to be caused by the coarse component. This work is relevant to mine detection using THz and millimeter wave (mmW) radiation.
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Todd W. Du Bosq, Todd W. Du Bosq, Robert E. Peale, Robert E. Peale, Arthur Weeks, Arthur Weeks, Phil Jardine, Phil Jardine, Melanie Stewart, Melanie Stewart, Jeffrey Grantham, Jeffrey Grantham, Daniel Dillery, Daniel Dillery, Don Lee, Don Lee, David Muh, David Muh, Glenn Boreman, Glenn Boreman, } "Terahertz and millimeter wave transmission of soils", Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); doi: 10.1117/12.584925; https://doi.org/10.1117/12.584925

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