Subsurface Imaging
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Scan day: 05 March 2014 UTC
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Description: Bioacoustics Research Lab at the University of Illinois at Urbana-Champaign.
William D. O'Brien, Jr. publications: An acoustic system for high-resolution imaging of objects buried in soil has been developed. Our system uses many of the same techniques as medical ultrasound, however, on a very different medium. Our goal is to image cultural artifacts in order to assess, in a rapid, highly sampled manner, the historical significance of a potential construction site. In a preliminary study conducted at the Bioacoustics Research Laboratory, the acoustic propagation properties of six types of soil were evaluated. The soils were chosen to represent a range of organic matter, sand, silt, and clay, and particle size, and they were investigated for varying moisture levels and compaction. The attenuation coefficient in the 1-10 kHz range varied approximately linearly with frequency, and the normalized attenuation coefficient ranged between 0.1 and 1.0 dB/cm-kHz with a mean of approximately 0.5 dB/cm-kHz. The propagation speed ranged from 80 to 250 m/s with values typically between 100 and 200 m/s. These values are in agreement with values predicted by the Biot theory for sound propagation is porous media.
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| Page title: | Subsurface Imaging |
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| IP-address: | 130.126.119.23 |