Distributed fiber-optic bi-directional strain-displacement sensor modulated by fiber bending loss

被引:21
|
作者
Li, C [1 ]
Zhang, YM
Liu, H
Wu, S
Huang, CW
机构
[1] Kunming Univ Sci & Technol, Coll Informat Engn & Automat, Kunming 650051, Peoples R China
[2] Tianjin Univ, Inst Modern Opt Instrument, Key Lab Optoelect Informat Sci & Technol, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
fiber-optic bi-directional strain-displacement chip; optical time domain reflectometer; freely suspended fiber; fiber bending loss; strain; displacement;
D O I
10.1016/j.sna.2003.10.083
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The distributed fiber-optic bi-directional strain-displacement sensor is composed of fiber-optic bi-directional strain-displacement chips and optical time domain reflectometer (OTDR). The operational principle is the modulation of fiber loss in OTDR, i.e. the strain and the displacement in monitoring positions are measured by the bending loss of optical fibers bonded on the tension-sensitized and compression-sensitized regions of the fiber-optic strain-displacement chips. Additionally, by inserting the time delay optic fiber, the moving direction of the substrate free ends in the fiber-optic bi-directional strain-displacement sensor can be identified by the trace taken with high spatial resolution in OTDR. The experiments indicate that the fiber-optic bi-directional strain-displacement sensor could measure strain and displacement by adopting the lengths of sensitive region and freely suspended fiber, the chip length, and attachment methods. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:236 / 239
页数:4
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