摘要
在Φ-OTDR(phase-sensitive optical time-domain reflectometer,相位敏感光时域反射计)传感系统中,光纤振动信号的提取和降噪尤为重要。文章通过搭建一套光纤振动传感系统,完成信号采集,并使用低通滤波、小波降噪、小波包分解及降噪等方法完成了实验研究。提出一种协同滤波降噪的方法,能够将信号的信噪比提高5.1 dB,完成信号的定位与提取,定位精度20 m。
In the Φ-OTDR(phase-sensitive optical time-domain reflectometer)sensing system,the extraction and noise reduction of optical fiber vibration signal is particularly important.In this paper,a set of optical fiber vibration sensor system was built to acquire signal.The experimental methods include low-pass filtering,wavelet de-noising,wavelet packet decomposition and de-noising.After using a new method of extracting and de-noising optical fiber vibration signal,the signal-to-noise ratio of the signal is improved by 5.1 dB,and the extraction of the signal location information is completed with the positioning accuracy of 20 m.
作者
文仲寺
江毅
WEN Zhong-si;JIANG Yi(School of Optoelectronics,Beijing University of Technology,Beijing 100081,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2020年第6期95-99,共5页
Instrument Technique and Sensor
关键词
分布式系统
光纤振动
Φ-OTDR
低通滤波
小波降噪
小波包分解
distributed system
fiber vibration
Φ-OTDR
lowpass filter
wavelets de-nosing
wavelets packet decomposition
