4 May 2009 Demultiplexing multiple-beam laser Doppler vibrometry for continuous scanning
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Abstract
Using Laser Doppler vibrometry (LDV) to find buried land mines has been shown to have a high probability of detection coupled with a low probability of false alarms. Previous work has shown that is it possible to scan a square meter in 20 seconds, but this method requires that discrete areas be scanned. This limits the use of LDVs for land mine detection to a confirmation role. The current work at the University of Mississippi has been to explore ways to increase the speed of scanning to allow the sensor to move down the road at speed. One approach has been to look at the feasibility of using multiple beams to look at the same spot, time division multiplexing, in order to build a time history over small ground segments as each beam passes over the spot. The composite velocity signature built from each beam will provide a long enough time series to obtain the necessary frequency resolution.
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Richard Burgett, Vyacheslav Aranchuk, James Sabatier, and Steven S. Bishop "Demultiplexing multiple-beam laser Doppler vibrometry for continuous scanning", Proc. SPIE 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV, 73030I (4 May 2009); doi: 10.1117/12.818219; https://doi.org/10.1117/12.818219
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