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4 April 1997 Remote-sensing visible and infrared method of underground objects using thermal image technique
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The infrared radiometer is widely used to detect invisible internal flaws of industrial structural elements, as one of the remote sensing devices. The thermal image method (TIM) was carried out to analyze the location and dimension of the flaw numerically. The method was applied to detect the obscured and underground structural elements, like piping, vessel, concrete slab and ancient tomb using solar and radiation heaters. Detection characteristics are numerically and empirically estimated using a model test piece. The detection limit and heat transfer mechanism pertaining to the present technique is also discussed quantitatively. It was clarified from a series of experiments and analysis that our proposed method was useful to detect the buried object and carried out the verification of heat transfer analysis. We examined experimentally to detect the buried ancient tombs as the application tests. We verified the existence of the invisible buried tomb by observing the non-uniform temperature distribution, as in the case of the test results using radar and electric resistance methods.
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Yoshizo Okamoto, Chanliang Liu, Hirotsugu Agu, and Terumi Inagaki "Remote-sensing visible and infrared method of underground objects using thermal image technique", Proc. SPIE 3056, Thermosense XIX: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (4 April 1997);

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