Temperature and refractive index high accuracy fiber sensing by using linewidths of FBS induced by TR2,m

作     者：Zhang, Wujun Lu, Yuangang Ni, Hongcheng Feng, Yuqin He, Chongjun Guo, Nan 

作者机构：Key Laboratory of Space Photoelectric Detection and Perception of Ministry of Industry and Information Technology Nanjing211106 China College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing211106 China Joint Laboratory of Spatial Intelligent Perception and Large Model Application Meishan620524 China 

出 版 物：《Measurement: Journal of the International Measurement Confederation》 (Meas J Int Meas Confed)

年 卷 期：2025年第254卷

核心收录：

学科分类：0707[理学-海洋科学] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程] 

基　　金：This work is supported by Open Project Funds for the Joint Laboratory of Spatial Intelligent Perception and Large Model Application (No. SIPLMA-2024-YB-09)  National Natural Science Foundation of China (61875086  62175105  and 62105045)  Fundamental Research Funds for the Central Universities of China (No. ILB240041A24)  and Natural Science Foundation of Jiangsu Province (No. BK20231451) 

主　　题：Temperature measurement 

摘      要：In this paper, a new method for temperature and refractive index (RI) simultaneous measurement by using the linewidths of forward Brillouin scattering (FBS) induced by torsional-radial acoustic modes (TR2,m) in optical fiber is proposed. The FBS induced by TR2,m with strong signal is detected by a new single-end reflective structure. We propose to measure temperature and RI simultaneously with high accuracy by using linewidths of two peaks of FBS corresponding to two TR2,m. In the proof-of-concept experiment, a thin polyimide-coated G657 fiber is used as sensing fiber, in which the thin coating not only provides high sensing sensitivity, but also achieves high mechanical strength. The experimental results show that the sensor has high temperature and RI measurement accuracy of 0.17 ℃ and 0.0005, respectively. The sensor with such new detection method, new detection structure and new sensing fiber possesses the benefits of high accuracy, high mechanical strength, and simplicity, which has many potential applications in the field of biomedicine and marine monitoring. © 2025 Elsevier Ltd