K-2332 ブリルアンゲインスペクトルを用いた複合材料構造健全性評価(J03-6 ヘルスモニタリング)(J03 知的材料・構造システム)

概要

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A Brillouin optical time domain reflectometer (BOTDR) is a fiber optic strain distributed sensing system which can measure strain along arbitrary regions of an optical fiber. We have used this system for structural health monitoring of composite structures, such as racing yachts. Although the BOTDR is very useful to measure strain distribution of a large area efficiently, it can't detect well small damage which causes stress concentration. Because its spacial resolution is usually more than 1 m and it measure average strain along a sensing fiber. In this paper, a newly method using a change of Brillouin gain spectrum is described. By using this method, we could detect damage of a composite, such as delamination, that causes steep gradient for an interval less than the spatial resolution to strain distribution.
一般社団法人日本機械学会の論文
2001-08-22