AE音源のダイナミクスと位置標定のための直列マルチセンサ光ファイバAEシステム(<小特集>高精度な新非破壊検査技術)

概要

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We developed an advanced multi-sensing optical fiber AE monitoring system with both a feed back and polarization controller. Optical fiber was wound on the horizontal hollow pipes with different diameters. The fiber between the plate and pipe first detected the in-plane motion of AE as the Lamb wave and then the resonant wave with resonance frequencies of the pipes. The resonance wave was found to be excited by the out-of-plane motion of the Ao mode wave arriving at the velocity of the frequency equivalent to the resonance frequency of the pipe. We studied source dynamics and source location of artificial sources such as Mode-I fracture. For the study of the source dynamics, we simulated wave form of first arrival So-mode Lamb wave utilizing the experimental overall transfer function of the second kind. Location of Lamb wave AEs on an isotropic (aluminum) plate were successfully estimated by suing unique location scheme.
2006-12-25