积分球在实验室内用于空间遥感器的辐射定标

文中介绍了国外可见光实时传输型航天遥感器在发射前使用积分球对其进行大气条件下辐射定标的技术,得出的定标系数A用于图像的辐射校正。阐述了积分球的设计原理与方法。计算了内壁涂料光谱反射率、光源功率、光源分布色温以及安放位置对积分球出射窗口输出辐亮度的影响。设计球体达到的基本指标为:球体直径Φ=1600mm,开口直径φ=300mm,最低级识分辐亮度(0.45～0.52μm)时L=1.03W/m~2.str,最高级L=12.79W/m~2.str,朗伯特性(中心点)±30°内优于1％,开口面均匀性η=0.9％,辐亮度不确定度δ=6％。用该球对CCD相机定标,结果与用“6S”软件计算的相一致。

THE INTEGRATING SPHERE USED IN THE RADIATIVE CALIBRATION FOR SPACE REMOTE SENSOR IN THE LABORATORY

This paper reports an application technique of real time translatable space visible light remote sensor, in which an integrating sphere was used for radiative calibration under the atmosphere condition before launch. The received calibrating coefficient A is for cali- brating calibration of images. This article clarifies the design principle of the integrating sphere, and calculates the influences of the inner-wall coating spectrum reflectivity, the power of light source, the distributing of the color temperature. It also consider the influence of the place for the light source upon the radiance at the exit window of the integrating sphere. Base indexes of the integrating sphere are followed : the diameter of the sphere = 1600 mm , the diameter of the exit = 300 mm, the lowest integrating radiance (0. 45 ~ 0.52 um) L = 1. 03W/m2. str, the superlative degree integrating radiance (0.45 - 0.52um) L = 12.79 W/ m . str, the lambertian characteristic (in the center) is better than 1% within ?30? the uniform of the exit is better than = 0. 9% , the uncertainty of radiance = 6% . The calibrating result is same as that of the program"6S" . The main parameters have met the international standards.