瑞利散射辅助的分布式光纤测温系统

Distributed Optical Fiber Temperature Measurement System Assisted By Rayleigh Scattering

为了提高基于单模光纤的分布式光纤拉曼测温系统的传感性能,基于后向瑞利散射信号与反斯托克斯信号强度比值的双路解调方案,设计了一种瑞利散射辅助的分布式光纤测温系统,并在累加平均去噪算法的基础上,采用小波阈值降噪算法,有效提高了系统性能。实验结果表明,在10.5 km的单模光纤上,系统的测温精度可达±1.0℃,并实现了多点升温实验,能够满足实际工程应用的需求。

In order to improve the performance of the single mode fiber based distributed optical fiber Raman temperature measurement system based on the Rayleigh scattering signal and anti-Stokes signal intensity ratio of duplex demodulation scheme,a Rayleigh scatter-ing assisted distributed optical fiber temperature measuring system is designed,and on the basis of the cumulative average denoising al-gorithm,using the wavelet threshold de-noising algorithm,the system performance is effectively improved.The experimental results show that the temperature measurement accuracy of the system can reach±1.0℃on 10.5 km single-mode fiber,and the multi-point heating experiment is realized,which can meet the needs of practical engineering applications.