基于可调谐掺铒光纤激光器和掺铒光纤放大器的光声光谱气体分析仪  

Photoacoustic Spectrometer Based on the Combination of Tunable Erbium Doped Fiber Laser and Erbium Doped Fiber Amplifier

作　　者：刘善峥[1] 张望[1] 于清旭[1] 

机构地区：[1]大连理工大学物理与光电工程学院,辽宁大连116024

出　　处：《中国激光》2009年第4期964-967,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60677010)资助项目

摘　　要：光声光谱技术用于检测低浓度乙炔气体具有灵敏度高、连续和快速实时在线测量的特点。采用近红外可调谐掺铒光纤激光器(TEDFL)串接大功率掺铒光纤放大器(EDFA)作光源,采用一阶纵向共振式双程吸收光声池,并运用波长调制和二次谐波检测技术,研制出一种新的高灵敏度微量气体近红外光声光谱分析仪。在常温常压下对低浓度乙炔气体的实验测量结果表明,该系统的极限检测灵敏度达到1.3×10^(-9),其线性响应相关度达到0.99957,能够满足工业、环境监测和电力系统等对乙炔检测和分析的需要。The technology of photoacoustic spectrum has features of high sensitivity, continuous and fast in situ measurement in detecting acetylene in low concentration. A new wavelength modulated photoacoustic spectrometer based on a near-infrared tunable erbium doped fiber laser （TEDFL） and a high power erbium doped fiber amplifier （EDFA） is developed. This system is demonstrated with low concentration acetylene measurement at the 1530.37 nm transition line, by incorporation of a first-longitudinal resonant photoacoustic cell with double absorption optical path and lock-in harmonic detection technique, yielding a detection limit of 1.3 × 10^-9 at room temperature and atmospheric pressure and this can meet the demands of acetylene detection and analysis in industry, environment monitoring and power system.

关 键 词：光声光谱学 光声光谱仪 可调谐光纤激光器 光纤放大器 波长调制 乙炔 

分 类 号：TH744.1[机械工程—光学工程]