Highly sensitive torsion sensor based on triangular-prism-shaped long-period fiber gratings

• 作者: Senyu Wang Yiwei Ma Xiaoyang Li Yang Yi Cuiting Sun Jingyu Lin Chengguo Tong Yuxiang Li Tao Geng Weimin Sun Libo Yuan
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Instrumentation, Measurement, and Optical Sensing
• 页码范围: 28-31
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL202119.041202

摘要

We propose and investigate a compact optical fiber sensor that aims to measure the torsion in both amount and direction with high sensitivity.This sensor is configured by a triangular-prism-shaped long-period fiber grating,which is fabricated by the high frequency CO2 laser polished method.The unique design of the triangular-shaped structure breaks the rotational symmetry of the optical fiber and provides high sensitivity for torsion measurement.In preliminary experiments,the torsion response of the sensor achieves a good stability and linearity.The torsion sensitivity is 0.54 nm/[rad/m],which renders the proposed structure a highly sensitive torsion sensor.