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  • Received: Sep. 16, 2019

    Accepted: Nov. 7, 2019

    Posted: Jan. 6, 2020

    Published Online: Jan. 7, 2020

    The Author Email: Tao Geng (gengtao_hit_oe@126.com)

    DOI: 10.3788/COL202018.021203

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    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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Chinese Optics Letters, Vol. 18, Issue 2, 021203 (2020)

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

Cuiting Sun1, Ran Wang1, Xiren Jin1, Zemin Wang1, Weiliang Liu1, Shuo Zhang1, Yiwei Ma1, Jingyu Lin1, Yue Li1, Tao Geng1,*, Weimin Sun1,**, Zhongquan Qu2, and Libo Yuan3

Author Affiliations

  • 1Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
  • 2Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
  • 3Photonics 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.

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