Fiber-Optic Pressure Sensor Based on Tunable Liquid Crystal Technology

被引：22

作者：

Feng, Jing

Zhao, Yun

Li, Su-shan

Lin, Xiao-wen

Xu, Fei

Lu, Yan-qing ^{[1
]}

机构：

[1] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2010年 / 2卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Fiber-optic systems; sensors; DISPERSION; STRESS;

D O I：

10.1109/JPHOT.2010.2045365

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：

We propose a photoelastic pressure sensor using a liquid crystal (LC) tunable fiber polarizer. The polarizer contains an etched single-mode fiber sealed in an LC cell. A low-index LC is used as a tunable birefringent cladding of the fiber. Any electric-field-induced LC director reorientation may thus affect the fiber's light-guiding characteristics. Different polarization states experience different LC cladding indices. The transmittance contrast between the x- and y-polarized modes reaches 31.9 dB, which is sensitive enough to monitor any polarization state change in the fiber. A pressure sensor with the sensitivity of 0.25 rad/N is thus demonstrated. The corresponding stress-optic coefficient of the fiber is measured at 1550-nm telecomm band. The advantages and applications of the LC tuning and sensing technologies are discussed.

引用

页码：292 / 298

页数：7

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