Application of wavelet analysis in distributed optical fiber Brillouin temperature strain monitoring system

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Feng, Zhou^1,2 ; Jianjun, Gan^3 ; Huan, Lv^2 ; Ligang, Cui^2

Water Conservancy and Civil Engineering Infrastructure Safety Key Laboratory, Nanchang Institute of Technology, Nanchang

330099, China^1

Civil and Architectural Engineering School, Nanchang Institute of Technology, Nanchang

330099, China^2

School of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology, 330099, China^3

关键词: Distributed optical fiber;    High-efficiency;    Identification accuracy;    Microdeformations;    Monitoring system;    Physical quantities;    Strain monitoring system;    Submarine tunnel;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/3/032026/pdf
DOI  :  10.1088/1755-1315/189/3/032026

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In the distributed optical fiber monitoring system, the Brillouin system is a system with the most difficult integration, the weakest signal and the most widely used range. It can monitor the strain and temperature of single fiber cable at the same time, and the monitoring range can exceed 100km. It is widely used in super engineering such as submarine optical cable, submarine tunnel, oil pipeline and so on. It is of great research value since this system can monitor the physical quantity of micro deformation, crack and temperature in real time. After the Brillouin system is built independently, the high precision extraction of Brillouin spectrum is realized by using the high efficiency denoising ability of wavelet. By studying the algorithm, the system can reach the temperature identification accuracy of ± 1 degrees centigrade, and the accuracy of strain reaches ± 20 μ.