Laser-induced acoustic imaging of buried land mines: experiment and modeling
The use for subsurface buried object detection of high-frequency (15-30 kHz) acoustic waves generated by CO2 laser pulses incident on the surface of dry sand has been demonstrated previously. In this work, field tests of the technique have demonstrated imaging of landmine simulants buried 2.5 cm bel...
| Main Authors: | , , , , |
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| Format: | Conference item |
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Society of Photo-optical Instrumentation Engineers
2001
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| Summary: | The use for subsurface buried object detection of high-frequency (15-30 kHz) acoustic waves generated by CO2 laser pulses incident on the surface of dry sand has been demonstrated previously. In this work, field tests of the technique have demonstrated imaging of landmine simulants buried 2.5 cm below the surface in an outdoor test track. Acoustic finite-difference time-domain calculations have given insight into the observed acoustic lineshapes and verified that the over-estimate of the target dimensions in the outdoor field trials may be related to the lower frequency detector used in these measurements. The models also suggest that a large increase in detected signal may potentially be gained by the use of a Laser Doppler Vibrometer interfacial velocity detector in the place of the present airborne microphone. |
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