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Proceedings Paper

Development of an interatmospheric window wavelength (5-9 μm) infrared thermography with an advanced image processing technique
Author(s): Daisuke Sato; Tatsuhito Komiyama; Takahide Sakagami; Shiro Kubo
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Paper Abstract

Recently, deterioration of concrete structures before their design life has become a serious social problem in Japan. Nondestructive inspection techniques are required, for detecting defects and damages in concrete structures, such as subsurface void or delamination. As one of these techniques, the thermographic NDT can be applied as an effective NDT technique to inspect large area of the objective structure from distant place. In addition, it does not require any chemicals and application of physical excitation for inspection. However, the thermographic NDT has a shortcoming that the measurement results are affected by the reflection of atmospheric radiation due to the sunlight, sky or surrounding materials. Since most of the buildings in Japan are covered with luster materials with low emissivity, such as tile or mortal, infrared reflection on the surface is difficult to be neglected. To reduce the influence of these reflection noises, the infrared thermography with detectable wavelength from 5 to 8 μm, which coincides with absorption range of moisture, is utilized. In this research, a new infrared thermography with 5 to 8 μm wavelength range by applying a band pass filter and an uncooled microbolometer infrared array detector. Further, a new signal to noise (S/N) ratio improvement technique has been developed in order to compensate a deterioration of sensitivity due to the band pass filter.

Paper Details

Date Published: 18 April 2006
PDF: 11 pages
Proc. SPIE 6205, Thermosense XXVIII, 62050B (18 April 2006); doi: 10.1117/12.668428
Show Author Affiliations
Daisuke Sato, Constec Engineering Co. (Japan)
Tatsuhito Komiyama, Constec Engineering Co. (Japan)
Takahide Sakagami, Osaka Univ. (Japan)
Shiro Kubo, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 6205:
Thermosense XXVIII
Jonathan J. Miles; G. Raymond Peacock; Kathryn M. Knettel, Editor(s)

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