Whole-field digital vibrometer system for buried landmine detection

Amit Lal; Cecil Hess; Eddie Scott; Michael Dang; Robert Nichols

doi:10.1117/12.604048

10 June 2005 Whole-field digital vibrometer system for buried landmine detection

Amit Lal, Cecil Hess, Eddie Scott, Michael Dang, Robert Nichols

Proceedings Volume 5794, Detection and Remediation Technologies for Mines and Minelike Targets X; (2005) https://doi.org/10.1117/12.604048
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Previous results have shown the potential of acoustic-to-seismic coupling with Laser Doppler Vibrometry for the detection of buried landmines. An important objective of the present technology is to improve the spatial resolution and the speed of the measurement. In this paper, MetroLaser reports on a whole-field digital vibrometer (WDV) that measures an entire one meter area with sub-centimeter spatial resolution in just a few seconds. The WDV is based on a dual-pulsed laser such that each pulse illuminates a one meter area on the ground, and the temporal separation between the two laser pulses can be adjusted to match the ground excitation frequency. By sweeping this excitation frequency, a displacement map of the ground at each frequency can be quickly generated. In addition, an innovative speckle repositioning strategy allows for movement of the measurement platform at reasonable speeds while still obtaining measurements with interferometric precision. This paper describes the WDV instrument and presents preliminary experimental results obtained with this system. This research is being supported by the U.S. Army RDECOM CERDEC NVESD under Contract W909MY04-C-0004.

Citation Download Citation

Amit Lal, Cecil Hess, Eddie Scott, Michael Dang, and Robert Nichols "Whole-field digital vibrometer system for buried landmine detection", Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); https://doi.org/10.1117/12.604048

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