That may actually work.  There are several research papers out there on this very type of research, like this one using frequency analysis of detector signals to get more accurate target discrimination: https://www.ndt.net/article/ecndt2006/doc/Tu.4.5.4.pdf Another interesting part of the above paper is how they are mapping out the shape of objects by using a small camera to determine the position of the detector as it sweeps across a buried object, the resulting image is like what one woul
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