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杂光分析是保证高光谱成像仪成像质量的关键技术之一。详细分析了高光谱成像仪光学系统的杂散光,设计了R-C前置镜的遮光罩和挡光环,并用Tracepro软件对高光谱成像仪光学系统进行了光机建模,分析了系统的一次、二次散射面,根据重要杂散光路径设置重点采用,计算出0.5°~40°不同离轴角度下的点源透射比值,从而得到地球表面反射光在像面产生的照度为5.5×10-3W/m2,小于中心视场光线在像面照度的3.5%,满足系统抑制杂散光的要求。
Stray light analysis is one of the key technologies to ensure the imaging quality of hyperspectral imagers. The stray light of hyperspectral imager optical system was analyzed in detail. The hood and the light blocking ring of RC front mirror were designed. The optical system of hyperspectral imager was modeled by using Tracepro software. According to the setting of the important stray light path, the point source transmittance is calculated at different off-axis angles from 0.5 ° to 40 ° so that the illuminance of the reflected light from the earth surface on the image plane is 5.5 × 10 -3 W / m2, less than 3.5% of the central field of view of the illumination in the image plane to meet the system requirements to suppress stray light.