针对大口径宽视场光学遥感器的相对辐射校正要求, 研究大口径积分球参考光源输出的均匀性.利用空腔辐射传输理论, 从发光单元辐出度分布及安装位置角度分析了积分球参考光源的均匀性, 分别在积分球出光口中心法线±30°~±36.8°、±30°~±45°位置安装点光源(卤钨灯)、近郎伯型面光源(LEDs)并进行优化设计.研制了直径为3 m, 开口直径为1 m的基于LEDs和卤钨灯的积分球参考光源, 并检测了参考光源的均匀性。检测结果表明, 积分球出光口Φ890 mm内的面均匀性、±60°以内的角度均匀性均优于99%, 与分析结果一致.

To meet the relative radiometric correction requirements of optical remote sensor with large aperture and wide viewing field, the uniformity of integrating spheres light source was studied. Base on sphere cavity radiant theory, the output uniformity of integrating spheres reference light source was analyzed from radiant emittance distribution and mounting position of emitting module. The point source(tungsten-halogen lamps) and Lambert radiant type of surface light source(LEDs) are respectively mounted on the position within ±30°~±36.8° and ±30°~±45° to the exit normal of integrating spheres through optimal design. Using uniformity analysis result, integrating sphere with diameter of 3 m and diameter exit port of 1 m was designed based on LEDs and tungsten-halogen lamps emitting modules, and the angular and planar uniformity were measured. The results show that the planner uniformity within Φ890 mm and the angular uniformity within ±60°are better than 99% to the exit normal.