摘要
论文基于光反馈原理及V型增强腔技术,结合量子串级激光器,搭建了CO吸收光谱检测系统.研究并实现了光反馈效应(反馈相位自动可调)、偶数和奇数腔模式效应、激光器阈值电流降低效应.系统有效反射率达到99.979%,在物理长度为47 cm的光腔内实现了4.48 km有效吸收路径.通过自动调节V型腔长,使光谱分辨率从0.005 3 cm^(-1)提高到0.001 1 cm^(-1).通过阿伦方差分析,确定了最高信噪比的积分时间为53 s.气体压强40 torr,温度20°C时,系统对CO(R(6)吸收线)检测准确度及检测极限分别达到(97.79±0.07)%和(0.49±0.04)ppb.也分析和证明了气体压强对CO的峰值吸收强度、检测准确度及检测极限的影响.
In this paper,based on optical feedback theory and V-shaped cavity-enhanced absorption spectroscopy,combined with quantum cascade laser,a detection system for CO was built up. The optical feedback effect,even and odd modes effect,and threshold current lowering effect were studied.The effective reflectivity of 99. 979% and the effective absorption path of 4. 48 km in a cavity with physical length of 47 cm were obtained. By adjusting the length of V-shaped cavity automatically,the spectral resolution was improved to 0. 001 1 cm^（-1） from 0. 005 3 cm^（-1）. With the best integration time of53 s obtained by allan variance,this optical system allows detection for the R（ 6） band of CO with high accuracy of（ 97. 79 ± 0. 07） % and the detection limit of（ 0. 49 ± 0. 04） ppb at pressure of 40 torr and temperature of 20 °C. The effects of gas pressure on the absorption peak value,detection accuracy and detection limit for CO were also analyzed and demonstrated.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期744-749,共6页
Journal of Infrared and Millimeter Waves
基金
国家创新研究群体基金(51321063)
国家重大科学仪器设备开发专项(2012YQ160007)
国家自然科学基金面上项目(51277185)资助的课题~~
关键词
腔增强吸收光谱
光学反馈
一氧化碳
cavity-enhanced absorption spectroscopy
optical feedback
carbon monoxide
