5-8μm波長帯赤外線サーモグラフィを用いた構造物外壁検査に関する研究

抄録

Nondestructive inspection methods using infrared thermography for detecting delamination of surface finishing material such as tiles or mortal on concrete structures have been employed for a long time due to their advantages of effectiveness being able to measure a wide area at once. However in the case of using infrared thermography having a sensitivity in 8-14μm spectrum band used in ordinary building inspection, there is a problem that infrared images are influenced by the reflection of surrounding infrared emitting sources such as solar radiation or high temperature heat sources. In this study, infrared ray in 5-8μm spectrum band is utilized its low reflectivity on shiny white tile surface and high spectrum absorbance of atmosphere for avoiding the reflection. Infrared thermography having a sensitivity in 5-8μm spectrum band is developed based on microbolometer infrared camera to make it possible to reduce the reflection on building surface. We measure the temperature distribution on the surface of the building using the infrared cameras having sensitivity in 5-8μm and 8-14μm spectrum bands. From experimental results, we found that 5-8μm spectrum band infrared camera has the ability of reducing the influence of solar reflection as well as the defect detectability.