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介绍了一套用于机载平台测量的非相干宽带腔增强吸收光谱(IBBCEAS)系统,并应用于实际大气NO_2空间分布的高时间分辨率观测.为满足机载测量中对时间分辨率的需求,系统采用离轴抛物面镜代替消色差透镜提高光学耦合效率;并运用Allan方差,对系统性能进行了分析.通过腔增强吸收光谱系统与长光程吸收光谱系统对实际大气NO_2的对比测试,两者线性相关系数R~2达到0.86.将IBBCEAS系统应用于机载平台,在时间分辨率为2 s的情况下,探测限达到95 ppt(1σ).通过机载观测,获得了华北地区石家庄等地上空对流层大气NO_2的廓线信息.
A set of incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) system for airborne platform measurement is introduced and applied to high time resolution observation of the actual atmospheric NO_2 spatial distribution.In order to meet the requirement of time resolution in airborne measurement, The system uses an off-axis parabolic mirror instead of an achromatic lens to improve the optical coupling efficiency, and uses the Allan variance to analyze the performance of the system.Compared with the real atmospheric NO 2 contrast test by cavity enhanced absorption spectroscopy system and long optical path absorption spectroscopy system The linear correlation coefficient R ~ 2 reaches 0.86. The IBBCEAS system is applied to airborne platform and the detection limit reaches 95 ppt (1σ) with the time resolution of 2 s. Atmospheric NO 2 profile information in the troposphere.