High Accuracy Gonioreflectometer for Solar Diffuser Spectral BRDF Measurement

Abstract

Abstract:

Bidirectional reflection distribution function (BRDF) measurement uncertainty of the solar diffuser has direct impact on the on board absolute radiometric calibration accuracy. Conventional BRDF measurement 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 established. 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, electronics and other related physical quantities of high precision calibration and traceability, BRDF measurement uncertainty of solar diffuser less than 1% is achieved.

Key words: radiometric calibration, on-board calibration, bidirectional reflection distribution function, solar diffuser

CLC Number:

O432
TB303

CHEN Hong-Yao, ZHANG Li-Ming, SHI Jia-Ding, SI Xiao-Long, CHEN Zheng-Guo, LI Jun-Lin, YANG Bao-Yun, WANG Ji-Xiang, ZHU Xue-Mei, DU Zhi-Qiang. High Accuracy Gonioreflectometer for Solar Diffuser Spectral BRDF Measurement[J]. Journal of Atmospheric and Environmental Optics, 2014, 9(1): 72-80.

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