18 October 2001 Environmental factors that impact the performance of a seismic landmine detection system
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Abstract
A system has been developed that uses high frequency seismic waves and non- contacting displacement sensors for the detection of land mines. The system consists of a moving displacement sensor and a stationary elastic-wave source. The source generates elastic waves in the earth. These waves propagate across the minefield where they interact with buried mines. The sensor measures the displacements at the earth's surface due to the passage of the waves and the interactions of the waves with mines. Because the mechanical properties of the mine are different from those of the earth, the surface displacements caused by the interaction are distinct form those associated with the free-field propagation of the waves. This provides the necessary cue for mine detection. The system has been demonstrated in a controlled laboratory environment, and efforts are currently underway to transition this work into field tests. Moving the experimental effort into the outdoor environment is a critical milestone toward the ultimate goal of this research effort, which is the design of a field-operable mine detection and classification system. There are many issues associated with this transition. Foremost among these is the propagation characteristics of seismic waves in the field environment and, particularly, the mechanisms that limit the energy which can be coupled into the seismic signal that is used to search for mines. To investigate this, a measurements was undertaken to determine the effects of environmental factors at both sites on the generation and propagation of seismic waves. At both sites, strong non-linearity was observed which limited the energy content of the incident signal.
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Gregg D. Larson, James S. Martin, Waymond R. Scott, George S. McCall, "Environmental factors that impact the performance of a seismic landmine detection system", Proc. SPIE 4394, Detection and Remediation Technologies for Mines and Minelike Targets VI, (18 October 2001); doi: 10.1117/12.445509; https://doi.org/10.1117/12.445509
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KEYWORDS
Land mines

Wave propagation

Sensors

Data modeling

Environmental sensing

Signal to noise ratio

Dispersion

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