• Chinese Optics Letters
  • Vol. 18, Issue 2, 021203 (2020)
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
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    DOI: 10.3788/COL202018.021203 Cite this Article Set citation alerts
    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 Copy Citation Text show less

    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.
    Φ=2πλ·L0(neffcoreneffclad),(1)

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    ΔλλδΔneffΔneff,(2)

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    δΔneff=(gcoreneffcoregcladneffclad)τ,(3)

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    Δλ=λΔneff(gcoreneffcoregcladneffclad)τ=KλΔneffτ=Tτ.(4)

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    (ΔτΔT)C=(0.1140.0570.0690.051)1(ΔλAΔλB),(5)

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    (ΔτΔT)C-C=(0.0870.0570.0480.051)1(ΔλAΔλB).(6)

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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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