日晕测量与日晕光度计外缘杂散光抑制试验

发布时间：2019-04-17 13:03

【摘要】：为配合大型太阳设备西部选址工作,研制了一架现代日晕光度计(Sky Brightness Monitor,SBM).前期实验对日晕光度计性能进行了测试,同时积累了云南部分址点的日晕数据.资料分析结果显示,轿子雪山正午前后的日晕水平最低可至日面中心强度百万分之几的量级(蓝波段).这表明该日晕光度计内部杂散光水平已达到了国际同类产品的标准.日晕光度计的内部杂散光源主要来自两部分:镜筒前端中性滤光片(ND4)固定套圈的边缘衍射(视场靠内区域)和镜筒内置光阑的边缘衍射(视场靠外区域).针对后者进行的变换光阑孔径大小试验结果证实,适当缩小光阑孔径可有效减小数据中视场靠外区域的衍射光干扰.
[Abstract]:A modern solar halo photometer (Sky Brightness Monitor,SBM) has been developed to match the site selection work of large solar equipment in the western part of China. The performance of the solar halo photometer was tested in the previous experiment, and the halo data of some address points in Yunnan Province were accumulated at the same time. The results of data analysis show that the lowest level of heliosphere before and after noon in Xueshan Mountain can reach the order of magnitude (blue band) of the intensity of heliocentric center. This indicates that the level of stray light inside the halo photometer has reached the international standard of the same kind of products. The interior stray light source of the heliophotometer mainly comes from two parts: the edge diffraction of the fixed ring of the neutral filter (ND4) at the front of the lens tube (the field of view is in the inner region) and the edge diffraction of the inner aperture of the lens tube (the field of view is outside). The experimental results on the aperture size of the converted aperture for the latter show that properly reducing the aperture size of the aperture can effectively reduce the interference of diffracted light in the outer region of the field of view in the data.
【作者单位】：中国科学院国家天文台/云南天文台;中国科学院研究生院;Center
【基金】：国家天文台天文专项(日晕光度计研制)项目国家自然科学基金项目(11073050、10933003、11078004)资助
【分类号】：P182.2

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