利用乳白玻璃测量日冕仪平场的方法

发布时间：2019-01-10 13:56

【摘要】：平场改正可以扣除日冕仪成像过程中的不均匀性,是其数据定标的必要步骤。提出一套基于乳白玻璃测量日冕仪平场的装置和方法,并开展了相关模拟和实地测量以验证该方法的可行性。首先,模拟了太阳经乳白玻璃后在日冕仪观测视场内扩散光源的均匀性,模拟结果表明其均匀度为99.98%,十分接近理想的均匀面光源。其次,测量了12cm地基日冕仪的平场,测量结果显示该方法可以测量出日冕仪成像的不均匀性,如探测器的条纹。平场改正后的结果符合日冕和天空背景亮度的径向分布。最后,为评价利用乳白玻璃测量平场的有效性,将其和天空平场进行了对比,二者相关系数为99.94%,线性拟合斜率为1,具有极强的相关性。
[Abstract]:The correction of flat field can deduct the inhomogeneity in the imaging process of coronal instrument and is the necessary step to calibrate its data. This paper presents a set of apparatus and method for measuring coronal flattening field based on milk white glass, and carries out related simulation and field measurements to verify the feasibility of the method. First, the uniformity of the diffusive light source in the field of view observed by the sun through the milky glass is simulated. The simulation results show that the uniformity is 99.98, which is very close to the ideal uniform surface light source. Secondly, the flat field of the coronal instrument based on 12cm is measured. The results show that the method can measure the inhomogeneity of the coronal imaging, such as the fringes of the detector. The corrected results of the flat field accord with the radial distribution of the brightness of the coronal and sky background. Finally, in order to evaluate the effectiveness of using glass to measure the flat field, the correlation coefficient is 99.94 and the slope of linear fitting is 1, which has a strong correlation with the sky flat field.
【作者单位】：中国科学院太阳活动重点实验室;中国科学院国家天文台;中国科学院国家空间科学中心;中国科学院云南天文台;
【基金】：国家自然科学基金(11427901,11503063,11427803,11273034,11373040,11573012) 中国科学院先导B项目(XDB09040200);中国科学院太阳活动重点实验室开放课题(KLSA201514,KLSA201515,KLSA201616)
【分类号】：TH753.12

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