Abstract

A torsion sensor based on the near-helical (NH) long period fiber grating (LPFG) is fabricated by using a high frequency pulsed CO₂ laser. Each groove of the NH-LPFG is spirally written in the four sides of a single-mode fiber. The NH-LPFG has a helical periodic vertical index modulation. This is different from the screw-type index modulation of the common helical LPFGs (H-LPFGs) fabricated in a twisted fiber. The torsion and temperature characteristics of the NH-LPFG are experimentally investigated. The temperature sensitivity is about 0.0668 nm/°C. The torsion sensitivity is 0.103 nm/(rad/m) and independent of the polarization state of incident light.

© 2018 Chinese Laser Press

Long period fiber grating based on periodically screw-type distortions for torsion sensing

Mi Deng, Jinshan Xu, Zhe Zhang, Zhiyong Bai, Shen Liu, Ying Wang, Yan Zhang, Changrui Liao, Wei Jin, Gangding Peng, and Yiping Wang
Opt. Express 25(13) 14308-14316 (2017)

Fabrication of helical long-period fiber gratings by use of a CO₂ laser

Seungtae Oh, Kyung Rok Lee, Un-Chul Paek, and Youngjoo Chung
Opt. Lett. 29(13) 1464-1466 (2004)

Broadband edge filter based on a helical long-period fiber grating and its application to a power-interrogated torsion sensor

Kaiyue Gao, Zhen Zhang, Bo Huang, Hui Hao, Hua Zhao, Peng Wang, and Hongpu Li
J. Opt. Soc. Am. B 39(4) 1075-1081 (2022)

Torsion bidirectional sensor based on tilted-arc long-period fiber grating

Yanxin Zhang, Weigang Zhang, Pengfei Wu, Lijian Bie, Lingxin Kong, Zhe Li, Yunshan Zhang, and Tieyi Yan
Opt. Express 27(26) 37695-37705 (2019)

Intensity-modulated directional torsion sensor based on a helical fiber taper

Qi Guo, Yong-qin Zhu, Tian-qi Shan, Xue-peng Pan, Shan-ren Liu, Zhao-kang Xue, Zhong-ming Zheng, Chao Chen, and Yong-sen Yu
Opt. Mater. Express 11(1) 80-88 (2021)