Volume Strain Sensor Based on Spectra Analysis of In-Fiber Modal Interferometer

被引：13

作者：

Xu, Zhilin ^{[1
]}

Sun, Qizhen ^{[1
,2
]}

Wo, Jianghai ^{[1
]}

Dai, Yi ^{[1
]}

Li, Xiaolei ^{[1
]}

Liu, Deming ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Peoples R China

[2] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England

来源：

IEEE SENSORS JOURNAL | 2013年 / 13卷 / 06期

关键词：

Modal interferometer; multimode-singlemode-multimode fiber structure; optical fiber sensor; volume strain sensing; TEMPERATURE;

D O I：

10.1109/JSEN.2013.2250952

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：

An optical in-fiber modal interferometer-based volume strain sensor for earthquake prediction is proposed and experimentally demonstrated. The sensing element is formed by wrapping a multimode-singlemode-multimode fiber structure onto a polyurethane hollow column. Due to the modal interference between the excited guided modes in the fiber, strong interference pattern could be observed in the transmission spectrum. Theoretical analysis verifies that the resonant wavelength shifts as a result of the volume strain variation caused by the column deformation with square root relationship. Sensitivity > 3.93 pm/mu epsilon within the volume strain ranging from 0 to 1300 mu epsilon is also experimentally demonstrated. By taking the response of bidirectional change of volume strain and the sluggish character of the employed sensing material into consideration, the sensing system presents good repeatability and stability.

引用

页码：2139 / 2145

页数：7

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