Thermal image study of detecting nearly underground structures by means of infrared radiometer

Yoshizo Okamoto; Zuofen Fan; Chanliang Liu; Terumi Inagaki

doi:10.1117/12.204864

28 March 1995 Thermal image study of detecting near-underground structures by means of infrared radiometer

Yoshizo Okamoto, Zuofen Fan, Chanliang Liu, Terumi Inagaki

Proceedings Volume 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1995) https://doi.org/10.1117/12.204864
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

An infrared radiometer is used to detect several flaws of industrial structural elements, as one remote sensing device. The thermal image method (TIM) was carried out to analyze 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 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 tests 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 analyzed by solving a transient two-dimensional heat-balance equation. Calculation results were quite useful to analyze the experimental heat flow behavior around the buried object.

Citation Download Citation

Yoshizo Okamoto, Zuofen Fan, Chanliang Liu, and Terumi Inagaki "Thermal image study of detecting near-underground structures by means of infrared radiometer", Proc. SPIE 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (28 March 1995); https://doi.org/10.1117/12.204864

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