&lt;title&gt;Remote sensing study of detecting of flaws in structural material&lt;/title&gt;

Okamoto, Yoshizo; Kaminaga, Fumito; Inagaki, Terumi; Numao, Tatsuya; Fukuzawa, Kimio; Ichikawa, Hiroya

doi:10.1117/12.141971

Cited by 2 publications

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“…4.CONCLUSION Thermal image technique (TIM) using the infrared radiometer was applied to detect underground buried objects. The preliminary model test had been conducted by solar, direct and indirect combustion heating methods.…”

Section: Experimental Test Resultsmentioning

confidence: 99%

<title>Thermal image study of detecting near-underground structures by means of infrared radiometer</title>

et al. 1995

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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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Section: Experimental Test Resultsmentioning

confidence: 99%

<title>Thermal image study of detecting near-underground structures by means of infrared radiometer</title>

et al. 1995

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“…The principle of the infrared thermal image method is applied to detect invisible flaws by observing a distortion and transient phase difference of a surface temperature distribution using the infrared radiometer. The abnormal temperature above the flaw is generated by a different rate of thermal permeation into the medium including the flaw if the thermal properties of the medium and the flaw are different [2].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis on internal and surface flaws by means of an infrared radiometer

Okamoto¹,

Kamoi²,

Ishii³

1998

Proceedings of the 1998 International Conference on Quantitative InfraRed Thermography

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Proven non-destructive tests have been widely used to detect invisible flaws. However, those methods are not remote sensing and cannot be applied in a severe environment. A thermal technique using the infrared radiometer is useful to detect the flaw, as is allows for remote sensing. In this paper, an abnormal radiation temperature distribution of the test piece was measured to detect the internal flaw by the infrared radiometer. The detection limit of the flaws was obtained experimentally and analysed numerically by means of analysis of the conductive heat flow around the flaw. The thermal image method represents thermal and detection behaviour of surface and internal flaws using the infrared radiometer. ' .

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<title>Remote sensing study of detecting of flaws in structural material</title>

Cited by 2 publications

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<title>Thermal image study of detecting near-underground structures by means of infrared radiometer</title>

<title>Thermal image study of detecting near-underground structures by means of infrared radiometer</title>

Thermal analysis on internal and surface flaws by means of an infrared radiometer

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