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| | Abstract | | We propose an identification method of a buried object using the frequency response range of the corresponding to the vibration velocity. Air-borne sound and a Scanning Laser Doppler Vibrometer are used for non contact acoustic imaging in the extremely shallow underground. Flat speakers that have a sharp directivity are used as vibration sources. Plastic container and unglazed pot are used as buried objects and they are buried in the sand about 2cm depth. First, noise waves are used for the confirmation of the buried object frequency response range. The frequency response range of the buried object is shown by a brightness mode image. And next, burst waves are emitted again to make a clear image. The frequency of the burst waves is set near the frequency response range. Finally, the buried object frequency response range is checked again by the same way. The clear image is made by using the optimum frequency. We confirmed the frequency response range of each buried objects. From the indoor experimental results, the response range of the plastic container was distinctly different from the result of unglazed pot. |
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