摘要
星上定标漫射板双向反射分布函数(BRDF)的测量不确定度直接影响着星上绝对辐射定标的精度。现有的BRDF测量装置难以在功能和测量精度等方面满足星上定标漫射板BRDF测量的要求,在这样的背景下,建立了BRDF绝对测量系统。该测量系统以高亮度、高均匀性积分球辐射源为照明光源、高精度串联式六轴机器人和中空分度盘为BRDF转角主体、宽光谱大动态范围辐射计为光电信号探测单元,通过几何、电子等相关物理量的高精度溯源及标校,实现了星上定标漫射板BRDF小于1%的测量不确定度。
Bidirectional reflection distribution function（BRDF） measurement uncertainty of the solar diffuser has direct impact on the on board absolute radiometric calibration accuracy. Conventional BRDF measure- ment apparatus is difficult to meet the requirements of on board absolute radiometric calibration in terms of measurement accuracy and function. In this context, a set of BRDF absolute measuring system was estab- lished. In the system, the high brightness, high uniformity integrating sphere radiation are used as light source, high-precision six-axis robot and indexing plate are used as BRDF gonioreflectometer, and wide spectrum of large dynamic range of the photoelectric detector is used as signal detection unit. Through geometry, elec- tronics and other related physical quantities of high precision calibration and traceability, BRDF measurement uncertainty of solar diffuser less than 1% is achieved.
出处
《大气与环境光学学报》
CAS
2014年第1期72-80,共9页
Journal of Atmospheric and Environmental Optics
基金
国家863计划(2012AA12A302-2)
中科院科研装备项目(YZ201125)
安徽省自然科学基金(1208085QD74)资助
关键词
辐射定标
星上定标
双向反射分布函数
太阳-漫射板
radiometric calibration
on-board calibration
bidirectional reflection distribution function
solar diffuser
