Chinese Optics Letters, 2020, 18 (2): 021203, Published Online: Jan. 7, 2020  

A new phase-shifted long-period fiber grating for simultaneous measurement of torsion and temperature Download: 766次

Author Affiliations
1 Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
2 Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
3 Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
Abstract
A novel phase-shifted long-period fiber grating (PS-LPFG) for the simultaneous measurement of torsion and temperature is described and experimentally demonstrated. The PS-LPFG is fabricated by inserting a pre-twisted structure into the long-period fiber grating (LPFG) written in single-mode fiber (SMF). Experimental results show that the torsion sensitivities of the two dips are ?0.114 nm/(rad/m) and ?0.069 nm/(rad/m) in the clockwise direction, and ?0.087 nm/(rad/m) and ?0.048 nm/(rad/m) in the counterclockwise direction, respectively. The temperature sensitivities of the two dips are 0.057 nm/°C and 0.051 nm/°C, respectively. The two dips of the PS-LPFG exhibit different responses to torsion and temperature. Simultaneous measurement of torsion and temperature can be implemented using a sensor. The feasibility and stabilization of simultaneous torsion and temperature measurement have been confirmed, and hence this novel PS-LPFG demonstrates potential for fiber sensing and engineering applications.

Cuiting Sun, Ran Wang, Xiren Jin, Zemin Wang, Weiliang Liu, Shuo Zhang, Yiwei Ma, Jingyu Lin, Yue Li, Tao Geng, Weimin Sun, Zhongquan Qu, Libo Yuan. A new phase-shifted long-period fiber grating for simultaneous measurement of torsion and temperature[J]. Chinese Optics Letters, 2020, 18(2): 021203.

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