Fiber-Optic Curvature Sensor Based on Cladding-Mode Bragg Grating Excited by Fiber Multimode Interferometer

被引：74

作者：

Zhou, Wenjun ^{[1
,2
]}

Zhou, Yan ^{[1
,3
]}

Dong, Xinyong ^{[1
]}

Shao, Li-Yang ^{[1
]}

Cheng, Jia ^{[3
]}

Albert, Jacques ^{[2
]}

机构：

[1] China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Peoples R China

[2] Carleton Univ, Dept Elect, Ottawa, ON K1S 5B6, Canada

[3] Zhejiang Prov Inst Metrol, Hangzhou 310013, Zhejiang, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2012年 / 4卷 / 03期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金;

关键词：

Fiber Bragg grating; multimode fiber; curvature measurement; temperature-independent; TILTED FIBER; LONG-PERIOD; BEND SENSOR; TEMPERATURE;

D O I：

10.1109/JPHOT.2012.2202895

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 sensing structure consisting of a short multimode fiber (MMF) spliced in just upstream of a uniform fiber Bragg grating (FBG) is proposed and experimentally demonstrated for temperature-independent curvature measurement. The short MMF section generates cladding modes in the fiber that contains the FBG. Several of these modes get reflected back by the FBG at shorter wavelengths and re-enter the launch fiber after passing through the MMF section. The net recoupling efficiency between the incident forward core mode and reflected cladding modes is -20 dB when the fiber is straight, but decays when a curvature applied on the sensing structure. A maximum sensitivity of 0.74 dB/m(-1) is obtained in a large measurement range up to -15.5 m(-1), with no orientation dependence of the sensitivity. The reflected coupled power variation is measured to be +/- 0.15 dB over the temperature range from 0 to 70 degrees C, allowing for temperature-independent curvature measurements.

引用

页码：1051 / 1057

页数：7

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