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Proceedings Paper

Detection and identification of potential land mine hazards by waterjet use
Author(s): O. Robert Mitchell; Thomas J. Herrick; David A. Summers; John A. Stuller; Robert Denier; Shixi Joe Qiu; Scott Bloomquist; Vittal S. Rao
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Paper Abstract

The impact of a waterjet stream emits an acoustic signal when the jet strikes a buried target object. The structure of the sound emitted depends on the energy in the jet, the target which is struck, and the surrounding media. A high pressure (less than 5000 psi) waterjet of diameter 0.01 inches can penetrate into the ground to a depth of greater than 8 inches in less than 0.02 seconds and will generate a distinct acoustic signal from any obstruction it encounters as it makes that hole. By analyzing the sounds generated from a series of jets, located at 2 - 3 inch intervals over the path width of a remotely controlled detection unit, it is possible to identify the location of suspicious objects ahead of a vehicle. Flow rates for such a system, which can cover a path width of 36 inches at walking speeds, are anticipated to be around 5 gallons per minute. We have made initial measurements on acoustic signals generated by waterjet impact and found that the response from buried land mines appears to be Gaussian, thus allowing second order statistics to characterize the signals. We have shown that under laboratory conditions, the power spectrum can be used to discriminate land mines from other underground objects such as rocks and metal pipes.

Paper Details

Date Published: 4 September 1998
PDF: 12 pages
Proc. SPIE 3392, Detection and Remediation Technologies for Mines and Minelike Targets III, (4 September 1998); doi: 10.1117/12.324252
Show Author Affiliations
O. Robert Mitchell, Univ. of Missouri/Rolla (United States)
Thomas J. Herrick, Univ. of Missouri/Rolla (United States)
David A. Summers, Univ. of Missouri/Rolla (United States)
John A. Stuller, Univ. of Missouri/Rolla (United States)
Robert Denier, Univ. of Missouri/Rolla (United States)
Shixi Joe Qiu, Univ. of Missouri/Rolla (United States)
Scott Bloomquist, Univ. of Missouri/Rolla (United States)
Vittal S. Rao, Univ. of Missouri/Rolla (United States)

Published in SPIE Proceedings Vol. 3392:
Detection and Remediation Technologies for Mines and Minelike Targets III
Abinash C. Dubey; James F. Harvey; J. Thomas Broach, Editor(s)

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