Multi-point strain measurement using FBG-OTDR optical fiber sensor
猿田 晃一; 小林 喬郎*
Saruta, Koichi; Kobayashi, Takao*
Fiber Bragg gratings (FBGs) are one of the promising sensor elements for structural health monitoring due to multi-point sensing capability of strain with a high sensitivity and spatial resolution. While current FBG strain sensors based on wavelength domain have been established and found a variety of applications, the number of FBGs in a single sensing arm is in practice limited up to several tens. This number of FBGs is insufficient to develop effective structural health monitoring systems by taking full advantage of multiplex capability of FBG sensors. We report a design and experimental demonstration of FBG strain sensor based on optical-time domain reflectometry (FBG-OTDR). In the presented method strain is measured as a change in the optical power reflected from FBGs, and each FBG signal is separated in time domain. Thus the number of FBGs is not limited by the spectrum range of the light source and the grating bandwidth. The experimental results show that 50 sensing points in a single sensing arm can be measured with an rms error of less than 1 microstrain.
使用言語 : English
掲載資料名 : EUR-26577-EN
ページ数 : p.490 - 496
発行年月 : 2014/07
出版社名 :
発表会議名 : 10th International Conference on Non Destructive Evaluation in Relation to Structural Integrity for Nuclear and Pressurized Components
開催年月 : 2013/10
開催都市 : Cannes
開催国 : France
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登録番号 : BB20131109
抄録集掲載番号 : 42001510
論文投稿番号 : 15138
Accesses  (From Jun. 2, 2014)
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