光学传感器星上定标漫射板的特性测量与分析

本文对研制的星上定标漫射板半球反射比(DHR)、双向反射比因子（BRF）、双向反射分布函数（BRDF）等反射特性进行了测量；同时，为了考察其在航天环境下的稳定性和适应性，进行了系列环境模拟试验。结果显示：星上定标漫射板反射率在可见近红外波段可达0.99，光谱差异小于0.01，短波红外波段在0.95以上; 10°~60°BRF变化低于0.1， 0°~60°BRDF变化小于0.048，其方向特性与光谱、紫外辐照关系不大；漫射板光学特性受原子氧、质子轰击影响甚微，而紫外辐照下的反射率衰变是由于有机物污染所致，通过改进工艺能够消除这种衰变；漫射板通过了航天级力学环境试验。研究表明：漫射板具备高反射率、光谱平坦性、朗伯性及其在航天环境下的稳定性，能够满足航天应用要求。

Measurement and Analysis of Diffuser Panel characteristics used for On-board Calibration for Satellite Optical Sensors

The optical properties, including directional/hemisphere reflectance(DHR), bidirectional reflectance factor (BRF)and bidirectional reflectance distribution function(BRDF) of diffuser panel used for onboard calibration for satellite optic sensors ,were measured. And, in order to investigate the stability and the adaptability of the panel under on-orbit environment, series of environment simulation tests were performed . As the results indicated : The reflectance achieve 0.99 at VNIR,0.95 at SWIR; and the differences of the reflectance at VNIR are within 0.01.The variety of BRF(10°~60°) and BRDF (0°~60°) are less than 0.1,0.048,respectively，and this Lambertian property of diffuser panel is independence to spectral band and UV radiation. Atomic oxygen exposure or proton bombardment has little effect on diffuser panel’s optical properties; Some degradation of optical properties under UV radiation has been linked to degradation of organic contaminants, but this contaminants can be prevented by improvement of production protocol. The diffuser panel have gone through on-orbit level mechanical environment tests. So, high reflectance, spectral flatness, Lambertian characteristics and stability in orbit of the diffuser panel were tested, which can satisfy space application.