Temperature-Independent Fiber Inclinometer Based on Orthogonally Polarized Modes Coupling Using a Polarization-Maintaining Fiber Bragg Grating

Sensors

Dan Su¹  Xueguang Qiao¹  Hangzhou Yang¹  Qiangzhou Rong¹  Zhengyuan Bai²  Yupeng Wang¹ 

[1] School of Physics, Northwest University, Xi'an 710069, China; E-Mails:;Key Laboratory of Material for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; E-Mail:

关键词: fiber optics sensor;    polarization-maintaining fiber bragg grating;    bending;   

DOI  :  10.3390/s141120930

来源: mdpi

【 摘 要 】

A reflection fiber inclinometer is proposed and experimentally demonstrated based on two linearly polarized (LP) modes coupling. The configuration consists of a section of polarization-maintaining fiber (PMF) containing a fiber Bragg grating (FBG) splicing with single mode fiber (SMF). Bending the PMF in the upstream of FBG can induce an additional birefringence of PMF, which results in the intensity changes of two LP modes owing to orthogonal polarization coupling. The experimental results represent that the device shows different bending responses at the angle range from 0° to 40°and from 64° to 88°, respectively. Moreover, the temperature change just shifts the wavelengths of LP modes reflected and does not influence their intensities, which effectively avoid the temperature cross-sensitivity and make it a good candidate for measuring inclinometer and temperature simultaneously.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.