110 アクティブ加熱サーモグラフィ法で取得した熱画像の逆解析による構造物損傷の検出(セッション3 画像処理と振動モード応用技術)

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  • 110 Detection of structural damages by inverse analysis of thermal images captured by thermography with active heating

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This paper presents 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 an infrared thermography camera. 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 failure as well as the depth of the damaged layer. The estimated depth is mapped as a depth image which displays the shape of the failure as well as their depth. Change passive heating to short active heating, create shape and depth image using thermal image in cooling process after active heating.

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