High-speed quasi-distributed strain sensing based on time division multiplexing of fibre Bragg gratings

被引：6
|
作者：
Ma, L. [1 ]
Ma, C. [1 ]
Wang, Y. [1 ]
Wang, D. Y. [1 ]
Wang, A. [1 ]
机构：
[1] Virginia Polytech Inst & State Univ, Bradley Dept Elect & Comp Engn, Ctr Photon Technol, Blacksburg, VA 24060 USA
来源：
ELECTRONICS LETTERS | 2016年 / 52卷 / 08期
基金：
美国国家科学基金会;
关键词：
high-speed optical techniques; strain sensors; strain measurement; Bragg gratings; fibre optic sensors; distributed sensors; high-speed quasidistributed fibre optic sensing technique; strain sensing; proof-of-concept experiment; multiple fibre Bragg gratings; pulsed broadband source; high-capacity multiplexing; static strain response; strain-delay conversion factor; dynamic strain measurement;
D O I：
10.1049/el.2015.4398
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：
A high-speed quasi-distributed fibre optic sensing technique for strain is proposed and a proof-of-concept experiment is performed. The sensing link is formed by multiple fibre Bragg gratings and interrogated by a pulsed broadband source. A dispersive unit is used to translate wavelength variations to time-delay changes to enable high-speed sensing capability. As the gratings can be weakly reflecting and nominally identical in their reflection spectra, this technique has the inherent capability of high-capacity multiplexing. Linear and repeatable static strain response was achieved with a strain-delay conversion factor of -3.37 ps/epsilon and a resolution of 4.73 epsilon. Dynamic strain was successfully measured at a sampling rate of 7 kHz and dynamic resolution of 0.2 epsilon/Hz was obtained.
引用
收藏
页码：643 / 644
页数：2
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