分布式激光甲烷检测系统振动干扰诊断与辨识
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摘要
为消除外界振动对分布式激光甲烷检测系统的影响,在分析振动对光纤物理特性及甲烷检测的影响、振动波形频率特征的基础上,提出一种基于实时采样信号和设定频率信号的振动波形辨识算法。该算法通过傅里叶变换、互相关运算、最大相似系数判定和甲烷浓度解算等步骤,有效识别出不同频率的外界振动波形,进而可准确删除振动波形,消除外界振动对甲烷浓度测量值的影响。实验室测试及工业性测试结果表明,该算法能有效识别出不同频率的振动干扰,避免振动信号引入的测量误差。
In order to eliminate influences of external vibration on distributed laser methane detection system,based on analysis of frequency characteristics of vibration waveform and influences of vibration on physical properties of fiber and methane detection,a vibration waveform recognition algorithm based on real-time sampling signal and set frequency signal was proposed.The algorithm can effectively identify external vibration waveforms with different frequencies by steps including Fourier transform,crosscorrelation operation,maximum similarity coefficient judgment and methane concentration calculation,and then the vibration waveform can be accurately deleted and the influences of external vibration on methane concentration measurement can be eliminated.The laboratory test and industrial test results show that the algorithm can effectively identify the vibration interference with different frequencies and avoid measurement error introduced by vibration signal.
In order to eliminate influences of external vibration on distributed laser methane detection system,based on analysis of frequency characteristics of vibration waveform and influences of vibration on physical properties of fiber and methane detection,a vibration waveform recognition algorithm based on real-time sampling signal and set frequency signal was proposed.The algorithm can effectively identify external vibration waveforms with different frequencies by steps including Fourier transform,crosscorrelation operation,maximum similarity coefficient judgment and methane concentration calculation,and then the vibration waveform can be accurately deleted and the influences of external vibration on methane concentration measurement can be eliminated.The laboratory test and industrial test results show that the algorithm can effectively identify the vibration interference with different frequencies and avoid measurement error introduced by vibration signal.
引文
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[16]LATHDAVONG L,SHAO J,KLUCZYNSKI P,et al.Methodology for detection of carbon monoxide in hot,humid media by telecommunication distributed feedback laser-based tunable diode laser absorption spectrometry[J].Applied Optics,2011,50(17):2531-2550.
[2]王玉田.光电子学与光纤传感器技术[M].北京:国防工业出版社,2003.
[3]卢雨,印新达,于本化,等.基于TDLAS的时分复用型甲烷多点监测系统[J].电子测试,2014(23):42-44.LU Yu,YIN Xinda,YU Benhua,et al.A multipoint methane sensing system of time division multiplexing based on TDLAS[J].Electronic Test,2014(23):42-44.
[4]FERRI D,FORNI L.Methane combustion on some perovskite-like mixed oxides[J].Applied Catalysis B Environmental,1998,16(2):119-126.
[5]邓广福,刘光达,周志坚.提高可调谐激光光谱气体检测精度的研究[J].激光与红外,2008,38(5):462-464.DENG Guangfu,LIU Guangda,ZHOU Zhijian.Research on improving gas detection precision based on tunable laser spectroscopy[J].Laser&Infrared,2008,38(5):462-464.
[6]许婷.利用可调谐半导体激光吸收光谱测量高温火焰中的CO浓度[D].杭州:浙江大学,2012.
[7]李军,孙世岭,龚仲强,等.一种微差压原位式取样激光甲烷在线分析系统[J].分析仪器,2016(5):1-5.LI Jun,SUN Shiling,GONG Zhongqiang,et al.A situ micro-differential pressure sampling device based on laser for on-line analysis of methane[J].Analytical Instrumentation,2016(5):1-5.
[8]李鹏.基于吸收光谱气体温度测量方法的研究[D].秦皇岛:燕山大学,2009.
[9]陈东,刘文清,张玉钧,等.可调谐半导体激光光谱火灾气体探测系统[J].中国激光,2006,33(11):1552-1556.CHEN Dong,LIU Wenqing,ZHANG Yujun,et al.Tunable diode laser spectroscopy system for fire gases sensing[J].Chinese Journal of Lasers,2006,33(11):1552-1556.
[10]CHAO X,JEFFRIES J B,HANSON R K.Absorption sensor for CO in combustion gases using2.3μm tunable diode lasers[J].Measurement Science&Technology,2009,20(11):115201-115209.
[11]LI H,FAROOQ A,JEFFRIES J B,et al.Nearinfrared diode laser absorption sensor for rapid measurements of temperature and water vapor in a shock tube[J].Applied Physics B,2007,89(2-3):407-416.
[12]阚瑞峰,刘文清,张玉钧,等.基于可调谐激光吸收光谱的大气甲烷监测仪[J].光学学报,2006,26(1):67-70.KAN Ruifeng,LIU Wenqing,ZHANG Yujun,et al.Infrared absorption spectrometer of monitoring ambient methane[J].Acta Optica Sinica,2006,26(1):67-70.
[13]陈玖英,刘建国,张玉钧,等.调谐半导体激光吸收光谱自平衡检测方法研究[J].光学学报,2007,27(2):350-353.CHEN Jiuying,LIU Jianguo,ZHANG Yujun,et al.Autobalanced detection based on tunable diode laser absorption spectroscopy[J].Acta Optica Sinica,2007,27(2):350-353.
[14]褚衍平,张景超,管立君,等.双气室气体检测系统的研究[J].应用光学,2008,29(3):390-393.CHU Yanping,ZHANG Jingchao,GUAN Lijun,et al.Double gas-cell detection system for gases[J].Journal of Applied Optics,2008,29(3):390-393.
[15]齐洁,董小鹏,沈炎鑫,等.基于扫描光源的光纤气体传感系统的研究[J].中国激光,2011,38(9):97-102.QI Jie,DONG Xiaopeng,SHEN Yanxin.Research on fiber gas sensor system based on scanning light source[J].Chinese Journal of Lasers,2011,38(9):97-102.
[16]LATHDAVONG L,SHAO J,KLUCZYNSKI P,et al.Methodology for detection of carbon monoxide in hot,humid media by telecommunication distributed feedback laser-based tunable diode laser absorption spectrometry[J].Applied Optics,2011,50(17):2531-2550.