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Proceedings Paper

Synthetic aperture acoustic imaging of non-metallic cords
Author(s): Aldo A. J. Glean; Chelsea E. Good; Joseph F. Vignola; John A. Judge; Teresa J. Ryan; Steven S. Bishop; Peter M. Gugino; Mehrdad Soumekh
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Paper Abstract

This work presents a set of measurements collected with a research prototype synthetic aperture acoustic (SAA) imaging system. SAA imaging is an emerging technique that can serve as an inexpensive alternative or logical complement to synthetic aperture radar (SAR). The SAA imaging system uses an acoustic transceiver (speaker and microphone) to project acoustic radiation and record backscatter from a scene. The backscattered acoustic energy is used to generate information about the location, morphology, and mechanical properties of various objects. SAA detection has a potential advantage when compared to SAR in that non-metallic objects are not readily detectable with SAR. To demonstrate basic capability of the approach with non-metallic objects, targets are placed in a simple, featureless scene. Nylon cords of five diameters, ranging from 2 to 15 mm, and a joined pair of 3 mm fiber optic cables are placed in various configurations on flat asphalt that is free of clutter. The measurements were made using a chirp with a bandwidth of 2-15 kHz. The recorded signal is reconstructed to form a two-dimensional image of the distribution of acoustic scatterers within the scene. The goal of this study was to identify basic detectability characteristics for a range of sizes and configurations of non-metallic cord. It is shown that for sufficiently small angles relative to the transceiver path, the SAA approach creates adequate backscatter for detectability.

Paper Details

Date Published: 11 May 2012
PDF: 8 pages
Proc. SPIE 8357, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII, 83570I (11 May 2012); doi: 10.1117/12.921703
Show Author Affiliations
Aldo A. J. Glean, The Catholic Univ. of America (United States)
Chelsea E. Good, The Catholic Univ. of America (United States)
Joseph F. Vignola, The Catholic Univ. of America (United States)
John A. Judge, The Catholic Univ. of America (United States)
Teresa J. Ryan, The Catholic Univ. of America (United States)
Steven S. Bishop, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Peter M. Gugino, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Mehrdad Soumekh, Soumekh Consulting (United States)


Published in SPIE Proceedings Vol. 8357:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII
J. Thomas Broach; John H. Holloway, Editor(s)

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