Chinese Optics Letters, 2020, Vol. 18, Issue 2, pp.
A new phase-shifted long-period fiber grating for simultaneous measurement of torsion and temperature
Sun Cuiting, Wang Ran, Jin Xiren, Wang Zemin, Liu Weiliang, Zhang Shuo, Ma Yiwei, Lin Jingyu, Li Yue, Geng Tao, Sun weimin, Qu Zhongquan, Yuan Libo
- Harbin Engineering University
- Yunnan Observatories, Chinese Academy of Sciences
- 哈尔滨 哈尔滨工程大学理学院
A novel phase-shifted long-period fiber grating (PS-LPFG) for 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, hence, this novel PS-LPFG demonstrates potential for fiber sensing and engineering applications.