2609 光ファイバAEシステムを用いた高温腐食管のAEモニタリング(S22-2 非破壊評価とモニタリング(2),S22 非破壊評価とモニタリング)

概要

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We developed a new heat resistant optical fiber AE system for evaluating corrosion of stainless steel pipe at elevated temperatures. In order to improve the heat resistance of the fiber, we adopted the optical fiber plated by nickel. The fiber was wound on the pipe directly and detected AEs from artificial source at 800℃ for 100hr at high S/N ratio. Next, we monitored AEs from molten salt attack of type-304 pipe below 700℃. AEs from fractures of oxide scale were detected during cooling of the pipe due to the mismatch of thermal expansion coefficients of the pipe and oxide scale. Sources of cylinder wave AEs, estimated by arrival time differences of the L- and F-modes, were located in the area attacked by molten salt.
2007-09-07