Date : 11-11-09 11:11
Surface-Contacting Vibrometers for Seismic Landmine Detection
 Author : 07 (141.♡.209.162)
Views : 4,711   recommend : 0  
   http://www.google.com/url?sa=t&rct=j&q=seismic%20water%20saturated%20m… [2176]
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

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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. ...

 
 

Total 3
No Topic Author Date Views Recommend
3 Surface-Contacting Vibrometers for Seismic Landmine Detectio… 07 11-09 4712 0
2 DC3DInvRes 072 12-15 5767 0
1 3DModelle 07 12-15 3485 0

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