18 May 2006 Speckle noise in a continuously scanning multibeam laser Doppler vibrometer for acoustic landmine detection
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Abstract
The multi-beam laser Doppler vibrometer (MB-LDV) has been successfully used for acoustic landmine detection in field experiments at an Army test site. Using the MB-LDV in a continuously scanning mode significantly reduces the time of the measurement. However, continuous motion of a laser beam across the ground surface generates noise at the vibrometer output due to dynamic speckles. This speckle noise defines the noise floor and the probability of detection of the system. This paper studies the origins of speckle noise for a continuously scanning LDV. The structure of the speckle field exhibits points of phase singularity that normally coincide with signal dropouts. The signal dropouts and phase singularities can cause spikes in the demodulated velocity signal, which increase the noise in the velocity signal. The response of FM demodulators to input signals causing spikes in the LDV output are investigated in this paper. Methods of spike reduction in the LDV signals have been developed and experimentally investigated.
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Vyacheslav Aranchuk, Amit K. Lal, Cecil F. Hess, James M. Sabatier, Richard D. Burgett, Ina Aranchuk, and William T. Mayo "Speckle noise in a continuously scanning multibeam laser Doppler vibrometer for acoustic landmine detection", Proc. SPIE 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI, 621716 (18 May 2006); doi: 10.1117/12.668783; https://doi.org/10.1117/12.668783
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