3210 光周波数リフレクトメトリを用いたFBGセンサによる分布計測法の理論的考察(J06-3 計測・モニタリングII,J06 知的材料・構造システム)

概要

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High spatial resolution and sensitivity are required in distributed strain measurements for structural health monitoring. The distributed strain measurements with the high spatial resolution can be implemented by optical frequency domain reflectometry (OFDR). We can easily map the strain profile along a long gauge FBG from a spectrogram by applying Fourier transform analysis with a sliding window to the signal obtained from the measurement system. The OFDR signal can be simulated by the transfer matrix method based on coupled-mode theory. We evaluated the spatial resolution from the results of simulations. We confirmed that the spatial resolution of the current system is about 4mm and it may be changed according to the location of the grating in the sensing fiber.
社団法人日本機械学会の論文
2006-09-15