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首页> 外文期刊>Metrologia: International Journal of Scientific Metrology: = Internationale Zeitschrift fur Wissenschaftliche Metrologie: = Journal International de Metrologie Scientifique >Comparison of bidirectional transmittance distribution function (BTDF) measurements on fused silica and sintered polytetrafluoroethylene diffusers
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Comparison of bidirectional transmittance distribution function (BTDF) measurements on fused silica and sintered polytetrafluoroethylene diffusers

机译：熔融二氧化硅和烧结聚四氟乙烯扩散器对双向透射率分布功能（BTDF）测量的比较

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摘要

Accurate determination of the bidirectional transmittance distribution function (BTDF) of transmissive diffusers is critical for the on-orbit spectral radiance calibration of several satellite-based, Earth remote sensing instruments. This study presents the results of the comparison of BTDF measurements by NASA Goddard Space Flight Center's Diffuser Calibration Laboratory and the National Institute of Standards and Technology's Spectral Tri-function Automated Reference Reflectometer facility on two transmissive diffusers: HOD-500, a synthetic fused silica sample manufactured by Hereaus Quarzglas, and Spectralon-250, a sintered polytetrafluoroethylene sample manufactured by Labsphere, Incorporated(3). BTDF measurements were acquired at seven wavelengths from 290 nm to 740 nm, at incident elevation angles of 0 degrees and 30 degrees, and at scatter elevation angles from 1 degrees to 15 degrees. Comparison of the measurements made by the two facilities revealed excellent agreement within their combined standard uncertainties. NASA chose the parameters for the BTDF measurements to be identical to those NASA used when measuring the BTDF of the flight diffusers to be flown onboard the Tropospheric Emissions: Monitoring of Pollution (TEMPO) and the Geostationary Environment Monitoring Spectrometer (GEMS) satellite instruments. Successful agreement between NASA and NIST of BTDF results, therefore, effectively validates the BTDF measurements NASA made for these satellite flight programs.
机译：准确确定透射漫射器的双向透射函数（BTDF）对于几种基于卫星的地球遥感仪器的轨道光谱光谱校准至关重要。本研究提出了NASA戈达德航天飞行中心扩散器校准实验室和国家标准和技术的谱三功能自动参考反射器设施的BTDF测量比较结果：HOD-500，合成熔融石英样品由Hereaus Quarzglas制造和Spectralon-250，由Labsphere制造的烧结聚四氟乙烯样品，掺入（3）。 BTDF测量以七个波长从290nm至740nm获取，入射仰角为0度和30度，并且在散射仰角到从1度到15度。两种设施的测量比较在其组合的标准不确定性中显示出优异的一致性。 NASA选择了BTDF测量的参数，以与测量飞行扩散器的BTDF的NASA相同，以便在对流层排放的船上飞行：污染（速度）和地球静止环境监测光谱仪（Gems）卫星仪器的监测。因此，NASA和NIST之间的成功协议，因此，有效地验证了为这些卫星飞行计划制造的BTDF测量NASA。

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