Infrared radiometer is used to detect several flaws of industrial structural elements, as one of remote sensing devices. The thermal image method (JiM) was carried out to analyse location and dimension of the internal flaws of mechanical components, like piping , vessel, slab and pile. Internal flaws were detected by visualizing abnormal behavior of radiation temperature distribution of the tested surface by solar and artificial heat injection.The induced nonuniform temperature shows the existence of the internal flaws imaged on the CRT display of the infrared radiometer. As one of application subject, the TIM method was extensively applied to near-underground buried materials of ancient remains, such as corner stone, stone settlement, shell mound and tomb.The paper represents basic experimental and analytical results of preliminary and demonstration model tests of the buried materials in the soil and rock by solar, direct and indirect combustion heaters. After continuous irradiation heating, we measured and recorded transient radiation temperature distribution of the tested ground surface which inserts the model near-underground test plates of stylene, concrete, stone and gravel, changing width and depth of the test plates. Nonuniform and discontinuous temperature distribution of the tested surface above the inserted plates shows the existence of near-underground buried materials.Furthermore, transient temperature and heat flow behavior was numerically analysed by solving a transient two-dimensional heat-balance equation. Calculation results were quite useful to analyse the experimental heat flow behavior around the buried object.
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