摘要
空间外差光谱仪(SHS)是近年来迅速发展起来的新型超光谱分析技术,但针对该项技术的定标研究方法还不成熟。本文在分析空间外差仪原理的基础上,探讨了SHS实验室定标方法,内容包括光谱定标和辐射定标。利用可调谐激光器与元素光谱灯,根据光谱带宽内的发射谱线所对应的波长,以及探测器尺寸与系统带宽之间的关系,设计了光谱定标方案。定标结果显示仪器光谱分辨率和光谱范围与理论设计值一致,通过多次光谱稳定性测试,光谱漂移较小。在辐射定标中,利用积分球系统进行了稳定性定标,利用标准灯和漫反射板完成了响应度定标,并利用定标系数进行了实例验证。定标结果显示该方法能够满足空间外差光谱仪定标要求,为获取的光谱数据进行定量反演奠定了基础。
Spatial heterodyne spectroscopy （SHS） is a novel method for hyperspectral analysis,but the calibration methods have not been thoroughly studied.The present paper gives some basic theories of SHS,and investigates the laboratory calibration methods,including spectral calibration and radiometric calibration.According to emission lines and the relation between detector size and system bandwidth,we designed the spectral calibration plan for SHS,which uses tunable laser and halogen lamp.Experiments show that the actual spectral range and resolution of our instrument is the same as it was designed,and the spectral shift is less by stability testing.For radiometric calibration,we measured the system’s stability by using integrating sphere,and its responses were also calibrated by using standard lamp and diffuser.The experimental results,after validation,proved that our method can be used for SHS calibration.This is a fundamental work for quantified retrieval.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2010年第6期1683-1687,共5页
Spectroscopy and Spectral Analysis
基金
国家(863计划)项目(2006AA12Z131)
中国科学院重要方向项目(KGCX2-YW-418)资助
