111 非定常熱画像の逆解析によるコンクリート構造物の欠陥イメージング(セッション3 画像処理)

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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 nonstationary thermal images of the structural surface captured by a infrared thermography camera is presented. In the proposed method, the structure is modeled as a homogeneous infinite plate whose boundary condition on the observed surface is known. The temperature field in the plate is represented by a truncated power series with respect to time, and a layer-by-layer inverse analysis scheme 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 is mapped on a depth image which can display the shape of the defects as well as their depth.
2009-12-08