On the detection of objects buried at a shallow depth using seismic wave reflections |
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Authors: | Papandreou Ben Brennan Michael J Rustighi Emiliano |
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Institution: | Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, United Kingdom. bp@isvr.soton.ac.uk |
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Abstract: | This paper concerns the detection of shallow (of the order 1 m) buried objects using seismic excitation. Time-extended signals are used to generate a compressional wave using a shaker attached to the ground. The wave propagates through the ground, reflects off a buried object and is captured by an array of geophones on the surface. The envelopes of the cross-correlation functions between the measured ground velocities and the excitation signal are calculated and summed to generate a cross-sectional image of the ground. The wide cross-correlation peaks caused by high ground attenuation are partially compensated for by using the generalized cross-correlation function called the phase transform. Simple simulations are conducted to demonstrate the method, and some field experiments have been carried out aimed at the detection of a buried concrete pipe. In the experiments the pipe could be detected using the method proposed, with experimental and simulated data producing good agreement. |
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