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基于超窄线宽激光器的多气体光声光谱检测研究
引用本文:陈霄,隋青美,苗飞,贾磊,王静.基于超窄线宽激光器的多气体光声光谱检测研究[J].光电子.激光,2011(11):1679-1682.
作者姓名:陈霄  隋青美  苗飞  贾磊  王静
作者单位:山东大学控制科学与工程学院;山东大学控制科学与工程学院;山东大学控制科学与工程学院;山东大学控制科学与工程学院;山东大学控制科学与工程学院
基金项目:国家自然科学基金资助项目(61074163)
摘    要:针对多组分痕量气体检测中精确度差、灵敏度低等问题,设计了基于光源波长扫描技术的光声光谱式多组分痕量气体检测系统。系统采用单一超窄线宽半导体激光器作光源,设计了一阶纵向共振式多光程吸收光声池,通过正弦信号对光源波长进行调制,并结合二次谐波信号检测技术和超窄线宽激光特性,有效地消除了吸收池内的背景噪声和光源抖动的影响,实现...

关 键 词:光声光谱学  多组分痕量气体检测  波长调制  超窄线宽激光器  多光程光声池  二次谐波检测

Multi-component gas high accuracy detection based on photoacoustic spectrometry and ultra-narrow-linewidth laser
CHEN Xiao,SUI Qing-mei,MIAO Fei,JIA Lei and WANG Jing.Multi-component gas high accuracy detection based on photoacoustic spectrometry and ultra-narrow-linewidth laser[J].Journal of Optoelectronics·laser,2011(11):1679-1682.
Authors:CHEN Xiao  SUI Qing-mei  MIAO Fei  JIA Lei and WANG Jing
Affiliation:School of Control Science and Engineering,Shandong University,Jinan 250061,China;School of Control Science and Engineering,Shandong University,Jinan 250061,China;School of Control Science and Engineering,Shandong University,Jinan 250061,China;School of Control Science and Engineering,Shandong University,Jinan 250061,China;School of Control Science and Engineering,Shandong University,Jinan 250061,China
Abstract:In order to solve the problem of low accuracy and sensitivity in multi-component trace gas detection,a kind of multi-component trace gas detection system based on wavelength scanning and photoacoustic spectrometry is designed.A semiconductor laser with ultra-narrow-linewidth and tunable wavelength is utilized as light source and a first-longitudinal resonant photoacoustic cell with multi-optical path is also used in this system.By taking the sine signal to modulate the wavelength of laser and combining the second harmonic signal detection technique with characteristics of ultra-narrow-linewidth laser,the detection of low concentration multi-component gases is achieved.The system is able to effectively eliminate the background noise and the influence of intensity fluctuation.The experiment results indicate that the relative measurement error is less than 2% and the linearity relevance coefficient is 0.99.The results of long time stability monitoring also show that the maximum relative fluctuation is less than 1.5%.Finally the sensitivity detection limits are determined to be:5×10-6 for acetylene,12×10-6for carbon monoxide and 15×10-6 for carbon dioxide.The system has advantages of high accuracy,high sensitivity and good stability,which can be used in power transformer fault gases on-line monitoring in real time.
Keywords:photoacoustic spectroscopy  multi-component trace gases detection  wavelength modulation  ultra-narrow-linewidth laser  multi-optical path photoacoustic cell  second harmonic detection
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