基于PPP-BOTDA的多核曲率传感测量研究

Research on Multi-Core Curvature Sensing Measurement Based on PPP-BOTDA.

作者信息

Liu Zijuan, Li Yongqian, Zhang Lixin, Wang Lei

机构信息

Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China.

Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China.

出版信息

Sensors (Basel). 2024 Sep 18;24(18):6023. doi: 10.3390/s24186023.

DOI:10.3390/s24186023

PMID:39338768

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11436064/

Abstract

To address the issue of spatial resolution limitations in traditional Brillouin optical time-domain analysis systems due to phonon lifetime constraints, we employed pre-pumped pulse technology. Additionally, to mitigate the double-peak phenomenon observed in pre-pumped Brillouin optical time-domain analysis systems, we implemented a two-sided band interference method to reduce the linewidth of the double-peak fitting. We conducted bending measurements on three eccentric cores and intermediate cores spaced 120° apart. Our results demonstrate that the system described in this paper can achieve a spatial resolution of 30 cm, with bimodal linewidths of 23.1 MHz and 16.0 MHz. Using the parallel transmission frame algorithm, we determined the curvature of a seven-core fiber with a curvature diameter of approximately 10 cm to be 20.67 m, with an error margin of 3.2%.

摘要

为解决传统布里渊光时域分析系统中由于声子寿命限制导致的空间分辨率受限问题，我们采用了预泵浦脉冲技术。此外，为减轻在预泵浦布里渊光时域分析系统中观察到的双峰现象，我们实施了双边带干涉方法以减小双峰拟合的线宽。我们对三个偏心芯和间隔120°的中间芯进行了弯曲测量。我们的结果表明，本文所述系统可实现30 cm的空间分辨率，双峰线宽分别为23.1 MHz和16.0 MHz。使用并行传输帧算法，我们确定曲率直径约为10 cm的七芯光纤的曲率为20.67 m，误差幅度为3.2%。