介绍了基于940 nm水汽弱吸收带的空间外差光谱探测系统。通过对水汽探测的光谱分辨率和光谱范围需求分析,进行了系统参数设计与实验装置的研制。利用可调谐激光器和元素谱线灯分别对实验装置进行了性能测试,选择少云晴朗天气,对实验装置进行了室外水汽探测实验。实验结果表明,实验装置性能指标与理论设计值一致,水汽实测谱与理论谱吻合,表明了空间外差光谱技术在水汽探测和信息反演方面的优越性。

Spatial heterodyne spectroscopy (SHS) experimental system based on 940 nm water vapor absorption band is introduced. According to analysis of spectral resolution and bandwidth for water vapor detection,the system parameters are designed and the experimental equipment is developed. The performance test using tunable laser and cathode hollow lamp,and water vapor detection in the clear weather is conducted. The results show that the experimental equipment′s practical capability is in agreement with theoretical index. Moreover,the observed and the theoretical water vapor spectrum are also coincident. Those demonstrate the superiority of SHS technique in water vapor detection and retrieval.