Time reversal acousto-seismic method for land mine detection

Alexander Sutin; Paul Johnson; James TenCate; Armen Sarvazyan

doi:10.1117/12.609838

10 June 2005 Time reversal acousto-seismic method for land mine detection

Alexander Sutin, Paul Johnson, James TenCate, Armen Sarvazyan

Proceedings Volume 5794, Detection and Remediation Technologies for Mines and Minelike Targets X; (2005) https://doi.org/10.1117/12.609838
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

We present the general concept and results of a pilot study on land mine detection based on the application of Time Reverse Acoustics (TRA). Applying TRA is extremely effective at focusing seismic waves in time and space, significantly improving detection capabilities using both linear and nonlinear wave methods. The feasibility of the system was explored in the laboratory and in small scale field experiments. The system included a multi-channel TRA electronic unit developed at Artann, five speakers for seismic-wave excitation and noncontact (laser vibrometer) or contact (accelerometer) devices for measurements of the surface vibration. Experiments demonstrated the high focusing ability of the TRA system. We observed excitation of highly focused seismic waves in an area with dimensions of the order of one wavelength. In the presence of a buried mock mine, the method led to an increase in the surface vibration amplitude and to significant nonlinear distortion of the TRA focused signal. Localization via TRA depends on the frequency of excitation, the depth of the buried mine, and the form and size of a mine mock. The nonlinear acoustic effect-higher harmonic generation-provides higher contrast for the mock-mine signal-response than for the surrounding medium. We also successfully tested an inversion method of the nonlinear TRA measurements earlier developed for medical ultrasound applications.

Citation Download Citation

Alexander Sutin, Paul Johnson, James TenCate, and Armen Sarvazyan "Time reversal acousto-seismic method for land mine detection", Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); https://doi.org/10.1117/12.609838

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