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NVST高分辨窄带成像系统视场频漂的实测与分析
Alternative TitleThe Measurement and Analysis of the Wavelength Shift of the FOV of Narrow-Band High-Resolution Imaging Channel at NVST
王良凯1,2; 徐稚1; 金振宇1; 陈宇超1,2; 许骏1
Source Publication天文研究与技术(Astronomical Research & Technology)
2018-10
Volume15Issue:04Pages:448-455
DOI10.14005/j.cnki.issn1672-7673.20180426.006
ClassificationP111.41
Contribution Rank第1完成单位
Indexed ByCSCD
Keyword里奥滤光器视场效应 频漂 Hα观测
Abstract

1 m新真空太阳望远镜的成像系统包括Hα,CaⅡ和He Ⅰ三个窄带成像通道,三者均使用里奥滤光器系统进行单色像观测。以Hα通道实测图像为例,探讨了在线心一线翼的偏带观测出现的太阳像亮度空间分布不均匀问题的原因。该不均匀性不同于杂散光.其空间分布形式与变化程度随观测波长点的不同而不同。通过对多组实测数据的分析认为.出现亮度不均现象的根本原因是滤光器的视场效应.视场边缘区域的工作波长相对中心区域发生频率漂移。频漂的程度和空间分布特征与光路装调密切相关,通过分析对比2017年3月光路调整前后频漂情况得出结论:在目前Hα成像通道2.2’的视场范围内,视场频漂量最大为0.005 nm,小于透过带带宽,且仅出现在视场左下角边缘。

Other Abstract

The working wavelength of the High-Resolution Imaging System operated at 1-meter New Vacuum Solar Telescope (NVST) includes 3 narrow-band wavelength: Ha (6562.8A), Ca II (3933A) and He I (10830A). The monochromatic observation of these 3 wavelength is implemented by tunable Lyot filters. This paper analyses the phenomenon of the spaeial non-unifrom intensity distribution of solar images at different off-bands based on observed data at the wavelength of 6562.8A (Ha channel). This non-uniform distribution is different to the stray light, for its spatial distribution and variation changes at different off-bands. The analysis of multiple sets of observation data shows the FOV effect of the Lyot filter results in this phenomenon, that the working wavelength at the edge of the FOV deviates from that at the centre of FOV and the degree of the wavelength shift depends on the accuracy of the optical installation. The wavelength shift at different part of the FOV of Ha channel is obtained and compared by the data before the optical adjustment in March 2017, and the result shows that within the 2.2' FOV of the Ha channel, the maximum wavelength shift is 0.05A, which is less than the passband of this Lyot filter (0.25A), and is located at the left corner of the FOV.

Funding Project国家自然科学基金[11473064] ; 国家自然科学基金[11473067]
Funding Organization国家自然科学基金[11473064, 11473067]
Language中文
Subject Area物理学 ; 光学 ; 天文学 ; 太阳与太阳系 ; 太阳与太阳系其他学科
MOST Discipline Catalogue理学 ; 理学::物理学 ; 理学::天文学
ISSN1672-7673
CSCD IDCSCD:6342681
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18303
Collection抚仙湖太阳观测站
Corresponding Author徐稚
Affiliation1.中国科学院云南天文台,云南,昆明,650011
2.中国科学院大学,北京,100049
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
王良凯,徐稚,金振宇,等. NVST高分辨窄带成像系统视场频漂的实测与分析[J]. 天文研究与技术(Astronomical Research & Technology),2018,15(04):448-455.
APA 王良凯,徐稚,金振宇,陈宇超,&许骏.(2018).NVST高分辨窄带成像系统视场频漂的实测与分析.天文研究与技术(Astronomical Research & Technology),15(04),448-455.
MLA 王良凯,et al."NVST高分辨窄带成像系统视场频漂的实测与分析".天文研究与技术(Astronomical Research & Technology) 15.04(2018):448-455.
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