星载成像光谱仪杂散光测量

星载成像光谱仪用于获得高准确度的光谱遥感数据,而杂散光是影响其光谱测量准确度的重要因素之一.介绍了此类成像光谱仪杂散光的定义、来源和危害,在比较截止滤光片法、光谱法、谱杂散光系数法等光谱仪器常用杂散光测量方法优缺点的基础上,论述了使用杂散光影响因子描述光谱仪杂散光的可行性和优越性.最后,介绍了使用窄带滤光片测量星载成像光谱仪杂散光影响因子的测量系统组成、测量步骤和测量结果,并分析了测量方法的不确定度.结果表明：杂散光影响因子能有效描述光谱仪的杂散光特性,测量结果与光源、探测器等测量条件无关；窄带滤光片法测量不确定度为0.646%（置信概率约为95%）,能满足星载成像光谱仪杂散光测量的工程需要.

Stray Light Measurement of Space-borne High Resolution Imaging Spectrometer

In order to measure the stray light,which is one of the important influence factors in spectral accuracy,the definition, source and harmfulness of stray light are introduced. Cut-off filter method, spectrum method, spectral stray light factors method and so on are presented to discuss the advantages and disadvantages of normally used stray light measurement methods. Then, the feasibility and superiority of the stray light factor used to describe the stray light characteristics of the spectral instruments, is investigated. At last, the system components, measurement procedure and measurement results of the stray light measurement system, using narrow-band filter, are introduced, and the uncertainty of the results is analysed. Results show that the stray light factor indicates the stray light characteristics of the spectral instruments effectively without relationship to the light source, detector and other measurement conditions. The relative uncertainty of the measurement is 0.646% when the fiducial probability is about 95%, which can meet the needs of the stray light measurement.