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> > > This idea is good and let me think a application for old saturated mine.... > > > > http://www.google.com/url?sa=t&rct=j&q=seismic%20water%20saturated%20mine%20detection&source=web&cd=3&ved=0CCUQFjAC&url=http%3A%2F%2Fmae.ucdavis.edu%2Fvlasaponara%2Flandmines.pdf&ei=ON-5TpmIBam62wXimoTSBw&usg=AFQjCNGsRTwBjvWrjyaR9ugJikimYhZVqQ&sig2=VF2q2-fjqPKWFt-2U6sCnw > > > > Standoff Acoustic Laser > Technique to Locate Buried > Land Mines > Robert W. Haupt and Kenneth D. Rolt > ■ The worldwide proliferation of land mines leads to thousands of civilian > casualties each year and threatens military forces who patrol hostile territories. To > reduce these casualties, military and humanitarian organizations seek methods > to detect the large variety of mines being deployed. Many mine detection systems > currently under development can detect only metal or a specific mine feature, > have limited standoff range, or are impractical for field operations. A promising > approach uses acoustic waves to induce mechanical vibrations in both plastic > and metal mines. The vibration field above these mines can then be measured > remotely with a laser Doppler vibrometer. This article describes a method to > advance acoustic land-mine detection by increasing standoff range from the > minefield and by developing a more practical lightweight system. We take a > novel approach to excite mines by using a parametric acoustic array (PAA) source > to transmit a highly directive sound beam from a safe distance. We discuss the > standoff system concept, the process of PAA wave generation, and the coupling > of acoustic waves to the ground to excite mines. A proof-of-concept system, > built at Lincoln Laboratory, deploys a commercial PAA and a commercial laser > vibrometer. We tested the system at a land-mine facility and measured distinct > vibration signatures from buried anti-personnel mines. The overall concept shows > promise. The PAA tested in these experiments, however, was developed for home > entertainment and has marginal power for land-mine detection, even at close > range. A system suitable for standoff detection requires more acoustic power > and substantial modification. We estimate that power gains up to 50 dB may be > achievable, and we discuss alternatives to the commercial PAA design > > ----------------------------------------------------- > > also see following > > [PDF] > Chapter 11 SEISMIC LANDMINE DETECTION > ftp://ftp.eng.auburn.edu/pub/riggsls/.../Chapter_11.pdf > File Format: PDF/Adobe Acrobat - Quick View > by WR Scott Jr - Cited by 2 - Related articles > vibration amplitudes associated with seismic mine detection are quite small. ...... in Sand, Part I: Water Table, Fluid Flow, and Saturation,” Geophysics, Vol. ... > > [PDF] > Chapter 11 SEISMIC LANDMINE DETECTION > ftp://ftp.eng.auburn.edu/pub/riggsls/.../Chapter_11.pdf > File Format: PDF/Adobe Acrobat - Quick View > by WR Scott Jr - Cited by 2 - Related articles > vibration amplitudes associated with seismic mine detection are quite small. ...... in Sand, Part I: Water Table, Fluid Flow, and Saturation,” Geophysics, Vol. ... > > > ----------------------------------------------- > PDF] > Resonance and Nonlinear Seismo-Acoustic Land Mine Detection > www.intechopen.com/download/pdf/pdfs_id/809 > File Format: PDF/Adobe Acrobat - Quick View > breakthrough in acoustic landmine detection had occurred with the discovery of landmine's ... authors demonstrated that a buried object like a mine reflects a portion of seismic energy ..... subjected to the controlled level of water saturation. ... >
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