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Sensors 2014, 14(11), 20930-20939; doi:10.3390/s141120930

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

1
School of Physics, Northwest University, Xi'an 710069, China
2
Key Laboratory of Material for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
*
Author to whom correspondence should be addressed.
Received: 24 September 2014 / Revised: 21 October 2014 / Accepted: 28 October 2014 / Published: 5 November 2014
(This article belongs to the Section Physical Sensors)
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Abstract

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. View Full-Text
Keywords: fiber optics sensor; polarization-maintaining fiber bragg grating; bending fiber optics sensor; polarization-maintaining fiber bragg grating; bending
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Su, D.; Qiao, X.; Yang, H.; Rong, Q.; Bai, Z.; Wang, Y.; Feng, Z. Temperature-Independent Fiber Inclinometer Based on Orthogonally Polarized Modes Coupling Using a Polarization-Maintaining Fiber Bragg Grating. Sensors 2014, 14, 20930-20939.

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