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22 August 2000 Acoustic mine detection coupling method using a liquid-filled roller array
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This acoustic mine detection system uses an acoustic array of hydrophones embedded within a unique fluid-coupling structure that deforms to the ground contours and has an acoustic impedance comparable to that of the ground to facilitate energy transfer and eliminate losses at the air ground interface. Broadband and impulsive acoustic array techniques are used to localize buried objects and interpret the buried object's surrounding. The goal of this system is a low-cost, hand-held mine detector that rolls or slides across the ground, suitable for a soldier ti inspect and clear a two-foot wide path. The array contains sensor and sound source, which send out various acoustic waveforms and analyzes the returning echoes and emissions to determine if an object buried below the surface has affected the propagating sound. The sensor on the array remain in a fixed linear geometry hovering over the ground to facilitate beamforming while eliminating the huge losses associated with coupling airborne sounds to the ground. Reflections at material discontinuities, as well as mine shape, materials, and depth contribute to the variations of the induced and resultant sound field. Preliminary data is presented that shows detections of underground objects, and a discussion of future efforts, to include further processing of the data introduced in this report.
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Michael V. Scanlon "Acoustic mine detection coupling method using a liquid-filled roller array", Proc. SPIE 4038, Detection and Remediation Technologies for Mines and Minelike Targets V, (22 August 2000);

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