Ultrasensitive strain sensor based on Vernier-effect improved parallel structured fiber-optic Fabry-Perot interferometer

被引：150

作者：

Nan, Tong ^{[1
]}

Liu, Bo ^{[1
]}

Wu, Yongfeng ^{[1
]}

Wang, Junfeng ^{[1
]}

Mao, Yaya ^{[1
]}

Zhao, Lilong ^{[1
]}

Sun, Tingting ^{[1
]}

Wang, Jin ^{[2
]}

机构：

[1] Nanjing Univ Informat Sci & Technol, Inst Opt & Elect, Nanjing 210044, Jiangsu, Peoples R China

[2] Nanjing Univ Informat Sci & Technol, Sch Elect & Informat Engn, Nanjing 210044, Jiangsu, Peoples R China

来源：

OPTICS EXPRESS | 2019年 / 27卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PRESSURE; FIBERS;

D O I：

10.1364/OE.27.017239

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel parallel structured fiber-optic Fabry-Perot interferometer (FPI) based on Vemier-effect is theoretically proposed and experimentally demonstrated for ultrasensitive strain measurement. This proposed sensor consists of open-cavity and closed-cavity fiber-optic FPI, both of which are connected in parallel via a 3 dB coupler. The open-cavity is implemented for sensing, while the closed-cavity for reference. Experimental results show that the proposed parallel structured fiber-optic FPI can provide an ultra-high strain sensitivity of -43.2 pm/mu epsilon, which is 4.6 times higher than that of a single open-cavity FPI. Furthermore, the sensor is simple in fabrication, robust in structure, and stable in measurement. Finally, the parallel structured fiber-optic FPI scheme proposed in this paper can also be applied to other sensing field, and provide a new perspective idea for high sensitivity sensing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：17239 / 17250

页数：12

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