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Proceedings Paper

Synthetic aperture acoustic measurements of stationary suspended cinderblock and surrogate substitutes
Author(s): Steven Bishop; Teresa Woods; Joe Vignola; John Judge; Mehrdad Soumekh
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Paper Abstract

A synthetic aperture acoustic approach is used as a standoff method to assess material properties of a typical cinder block, referred to as a concrete masonry unit (CMU), and a variety of CMU surrogates. The objective is to identify anomalies in CMU wall surfaces. The acoustic specular return and phase change across the blocks are the fundamental measurements of interest. The CMU surrogates are created from commercially available closed cell expanding foam. Results from three test articles are presented that show potentially exploitable differences in terms of acoustic magnitude and acoustic phase response between the surrogates and typical CMUs. The test articles are; a typical CMU, a foam block, and a foam block with an embedded steel object. All test articles are similar in size and shape, and both foam blocks are covered in grout so that surface appearance closely matches that of a CMU. The results show that each of the test articles has characteristics that may be used for discrimination and anomaly detection.

Paper Details

Date Published: 4 May 2009
PDF: 11 pages
Proc. SPIE 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV, 73030J (4 May 2009); doi: 10.1117/12.817094
Show Author Affiliations
Steven Bishop, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Teresa Woods, The Catholic Univ. of America (United States)
Joe Vignola, The Catholic Univ. of America (United States)
John Judge, The Catholic Univ. of America (United States)
Mehrdad Soumekh, Soumekh Consultant, Inc. (United States)

Published in SPIE Proceedings Vol. 7303:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV
Russell S. Harmon; J. Thomas Broach; John H. Holloway Jr., Editor(s)

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