202 コンクリート構造物表面の赤外線画像の逆解析による欠陥検出法の改良(セッション4 画像処理・超音波センサ) [in Japanese] 202 Improvement of Defect Detection Method for Concrete Structures Based on the Inverse Analysis of Surfacial Infrared Images [in Japanese]
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In this paper, a method to identify the geometrical shape and the location of the defect embedded in a concrete structure by processing the thermal image of the structural surface acquired by infrared thermography is presented. In the proposed method, the structure is modeled as a homogeneous infinite plate whose boundary condition on the observed surface is known. A layer-by-layer inverse analysis using a regularized interlayer transfer matrix based on 2D Fourier transform is carried out to obtain the sharper image of the defect as well as the depth of the damaged layer. The estimated depth information mapped on the image plane has resulted in a depth image which can display the shape of the defects as well as their depth simultaneously. An improved method introducing equivalent virtual heat sources that prevent the "boundary artifact" caused by the heat flux across the image boundary is presented.
- The Proceedings of the Symposium on Evaluation and Diagnosis
The Proceedings of the Symposium on Evaluation and Diagnosis 2008.7(0), 78-81, 2008
The Japan Society of Mechanical Engineers