Ray-based numerical simulations of monostatic and bistatic GPR responses for several tank and pipe configurations reveal the potential for noninvasive diagnostic evaluations. Examples include discrimination of the material from which a tank is constructed, its size, contents, fluid levels, and shape changes. Ambiguities occur when different configurations give similar responses, and evaluations become less reliable as noise increases. Simulations are able to reproduce the salient features of field GPR data recorded over a metal pipe, and over plastic pipes filled with air, fresh water, and salt water.

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