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
- 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
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.