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以一款外掩式白光日冕仪[其视场为2.5~15 R⊙(太阳半径),分辨率为14sec/pixel,口径为30mm,焦距为200mm]为基础,对日冕仪外掩体以及外掩体支撑杆带来的渐晕问题进行了分析计算,得到日冕仪渐晕表达式。以此式为基础,计算模拟了不同外掩体和物镜间距下的渐晕图。模拟结果显示,外掩体与物镜的距离越远,外掩体以及支撑杆所带来的渐晕越小。用日冕仪原理演示样机实验,验证了理论分析和模拟结果,并在此基础上对目标图像进行了渐晕补偿,成像效果得到明显改善。
Based on an external mask type white coronagraph [its field of view is 2.5 ~ 15 R⊙ (sun radius), resolution of 14sec / pixel, diameter of 30mm and focal length of 200mm] The vignetting problem caused by the support rod is analyzed and calculated, and the coronal corona expression is obtained. Based on this formula, the vignetting of different outer shelters and objective lens is simulated. The simulation results show that the distance between the outer cover and the objective lens is further reduced, and the vignetting caused by the outer cover and the support rod is smaller. The coronagraph principle was used to demonstrate the prototype experiment. The theoretical analysis and simulation results were validated. On the basis of this, the vignetting compensation was done on the target image, and the imaging effect was obviously improved.