消除采样累加过程中的周期性噪声对DTS精度的影响
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摘要
分布式光纤测温系统中不仅有白噪声干扰,还有周期性噪声干扰,而传统的采样累加平均方法仅能消除白噪声干扰。提出一种在采样累加过程中对采样周期内各点累加的方法,判断和滤除采样周期内的周期性信号。测温实验结果表明,通过在累加过程中设置判据消除周期性噪声,分布式光纤测温系统的精度得到了大幅提高。
Both white noise and periodic noise exist in distributed optical fiber temperature measurement systems.Traditional sample-accumulative averaging method can only eliminate white noise.In this paper,a method of accumulating points in the sampling period during the sampling and accumulating process was proposed to judge and filter out the periodic signals in the sampling period.Temperature measurement experiments indicate that the accuracy of the DTS is greatly improved by setting the criterion to eliminate the periodic noise during the accumulation process.
Both white noise and periodic noise exist in distributed optical fiber temperature measurement systems.Traditional sample-accumulative averaging method can only eliminate white noise.In this paper,a method of accumulating points in the sampling period during the sampling and accumulating process was proposed to judge and filter out the periodic signals in the sampling period.Temperature measurement experiments indicate that the accuracy of the DTS is greatly improved by setting the criterion to eliminate the periodic noise during the accumulation process.
引文
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[4]王剑锋,刘红林,张淑琴,等.基于拉曼光谱散射的新型分布式光纤温度传感器及应用[J].光谱学与光谱分析,2013,33(4):865-871.Wang Jianfeng,Liu Honglin,Zhang Shuqin,et al.New type distributed optical fiber temperature sensor(DTS)based on Raman scattering and its application[J].Spectroscopy and Spectral Analysis,2013,33(4):865-871.
[5]余向东,张在宣,祝海忠,等.采用智能温度补偿电路的分布式光纤喇曼温度传感器[J].光子学报,2011,40(12):1870-1874.Yu Xiangdong,Zhang Zaixuan,Zhu Haizhong,et al.An intelligent temperature compensating circuit for distributed optical fiber Raman temperature sensor[J].Acta Photon.Sin.,2011,40(12):1870-1874.
[6]Su Huaizhi,Li Jinyou,Hu Jiang,et al.Analysis and backanalysis for temperature field of concrete arch dam during construction period based on temperature data measured by DTS[J].IEEE Sensors J.,2013,13(5):1403-1412.
[7]宁枫,朱永,崔海军,等.一种提高分布式光纤测温系统空间分辨率的线性修正算法[J].光子学报,2012,41(4):408-413.Ning Feng,Zhu Yong,Cui Haijun,et al.A linear correcting algorithm for improving space resolution of distributed optical fiber Raman temperature measurement system[J].Acta Photon.Sin.,2012,41(4):408-413.
[8]汤玉泉,孙苗,李俊,等.基于喇曼散射的分布式光纤温度传感器的温度修正[J].光子学报,2015,44(5):0506006.Tang Yuquan,Sun Miao,Li Jun,et al.Temperature calibration of distributed optical fiber temperature sensor based on Raman scattering[J].Acta Photon.Sin.,2015,44(5):0506006.
[9]刘磊,于淼,杨瑞娟,等.小波去噪用于光纤拉曼温度传感系统[J].中国激光,2013,40(6):220-224.Liu Lei,Yu Miao,Yang Ruijuan,et al.Wavelet denoising applied in optical fiber Raman temperature sensor system[J].Chinese J.of Lasers,2013,40(6):220-224.
[10]余向东,金尚忠,张在宣,等.采用单工循环编码解码的分布式光纤喇曼温度传感器[J].光子学报,2014,43(7):0706005.Yu Xiangdong,Jin Shangzhong,Zhang Zaixuan,et al.Adistributed optical fiber Raman temperature sensor with cyclic simplex coding[J].Acta Photonica Sinica,2014,43(7):0706005.