基于毛玻璃的全日面太阳像平场测量和改正方法

发布时间：2018-06-18 04:01

本文选题：毛玻璃 + 太阳望远镜　；参考：《科学通报》2017年26期

【摘要】：全日面太阳光球像和色球像是监测太阳活动的主要数据,对望远镜观测的原始图像进行平场改正是数据处理过程中的基础工作.本文尝试利用毛玻璃测量全日面太阳光球和色球像的平场,通过理论模拟和实地测量验证了该方法的有效性.首先,模拟计算了太阳经毛玻璃扩散后在观测视场内形成的面光源的均匀性,其均匀度为99%,可以用来测量平场.其次,在全日面太阳光球和色球望远镜上的实验结果表明,本方法获得的平场像能够改正原始观测像中高频的脏点和光路不均匀性,因平场观测和常规观测图像中杂散光影响不同,导致平场改正像存在低频失真,但可通过理论临边昏暗图像对平场改正像进行低频信息修正.修正后的平场改正像与理论临边昏暗像相关系数达到0.99以上.最后,以HMI发布的光球像和GONG发布的色球像作为参考像,选取活动区所在小视场和宁静区大视场,分别与利用本方法实验改正后的光球像和色球像进行了结构相似度等方面的量化对比.对比结果表明,改正像的各项指标均优于原始像.本文提出的平场测量和改正方法简便易行,且容易实现自动化测量,为全日面太阳望远镜的平场测量和改正提供了新方法.
[Abstract]:It is the basic work of data processing to correct the original image of the telescope for the correction of the flat field of the solar sphere image and color sphere image of the whole heliosphere to monitor the solar activity of the main data in the process of data processing. In this paper, we try to measure the flat field of sunballs and chromosphere images of all heliosphere by using ground glass. The effectiveness of this method is verified by theoretical simulation and field measurement. First, the uniformity of the surface light source formed in the observed field of view after the sun diffuses through the ground glass is simulated and calculated. The uniformity of the light source is 99%, which can be used to measure the flat field. Secondly, the experimental results on the sunball and color sphere telescope show that the flat-field image obtained by this method can correct the dirty points and the non-uniformity of the optical path in the original observation image. Because of the different influence of stray light in the plane field observation image and the conventional observation image, there is low frequency distortion in the flat field correction image, but the low frequency information of the level field correction image can be corrected by the theoretical edge dim image. The correlation coefficient between the corrected flat-field corrected image and the theoretical edge dim image is above 0.99. Finally, with the light sphere image published by HMI and the color sphere image published by long as reference images, the small field of view and the large field of view in quiet area are selected. The results are compared with the structure similarity of the optical spherical image and the color sphere image after the experimental correction by this method. The results show that the corrected image is superior to the original image. The flat field measurement and correction method presented in this paper is simple and easy to realize the automatic measurement, which provides a new method for the flat field measurement and correction of the solar telescope.
【作者单位】：中国科学院国家空间科学中心;中国科学院大学;中国科学院国家天文台;
【基金】：国家自然科学基金(11503063,11178005,11427901)资助
【分类号】：P182.2

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