Fabry-Perot滤光器定标方法的研究

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	Fabry-Perot滤光器定标方法的研究
其他题名	Study of the calibration method for Fabry-Perot filter
	朱瑾
学位类型	电子信息硕士
导师	马琳 ; 杨绍明
	2024-07-01
学位授予单位	中国科学院大学
学位授予地点	北京
学位专业	电子信息
关键词	F-P滤光器腔长定标平行度定标中心波长 Hα谱线
摘要	Fabry-Perot（F-P）滤光器具有带宽窄、透过率高和通光口径大等优点，是太阳二维成像光谱观测系统中的重要组成部分，观测时通过改变滤光器腔长实现中心波长的调谐，从而获得不同的波长响应，完成对太阳谱线的扫描。滤光器的腔长直接决定了中心波长，腔长误差会导致中心波长漂移，降低光谱观测精度；F-P腔由两块平板组成，平板间的不平行会导致谱线展宽，降低光谱分辨率。为了实现高质量的二维成像光谱观测，必须对F-P滤光器的中心波长和带宽进行定标，即对F-P滤光器的腔长和平板平行度进行定标。本论文研究了F-P滤光器的定标方法，包括腔长和平行度两部分。其中，腔长定标利用F-P滤光器强度调制曲线的周期性和双波长强度调制曲线中峰值间的差异性，建立控制器数值和滤光器腔长的对应关系，并根据腔长和波长的对应关系实现波长定标。平行度定标利用不同区域控制器数值的差异求出腔长的差异值，再根据腔长的差异值求取倾角，实现平行度的定标。研制了F-P滤光器定标系统，在实验室进行定标实验及误差分析。开展F-P滤光器稳定性实验。定标实验结果表明，实际观测H太阳谱线时，F-P滤光器的波长定标精度优于0.0095Å；F-P滤光器平板x、y方向的平行度分别为0.2785”、0.3626”，定标精度分别为0.010”、0.011”；用两种方法得到M1、M2、M1’、M2’的半高全宽，分别为：0.03285968Å、0.03548539Å、0.03284920Å、0.03547363Å；以及0.04572411Å、0.04735554Å、0.04712768Å、0.04856849Å，完全满足NVST二维成像光谱观测系统的使用要求，验证了该定标方法的可行。在实验室环境下，研究F-P滤光器的稳定性。结果表明：单位步长随控制器数值的增加逐渐增大，单位步长随温度变化随机变化；波长半高全宽随控制器数值的增加逐渐减小，波长半高全宽随温度变化随机变化；峰值位置对应的控制器数值与扫描的方向有关，当扫描方向相同时，随扫描次数逐渐增大，并且每个峰值增大的趋势基本一致。
其他摘要	Fabry-Perot (F-P) filter, which has the advantages of narrow bandwidth, high transmittance and large aperture, are an important part of the solar two-dimensional imaging spectroscopy observation system, and the central wavelength tuning is achieved by changing the cavity length of the filter to obtain different wavelength responses and complete the scanning of solar spectral lines. The cavity length of the filter directly determines the centre wavelength, and the error of the cavity length will lead to the drift of the centre wavelength and reduce the spectral observation accuracy; the F-P cavity consists of two flat panels, and the non-parallelism between the flat panels will lead to the broadening of the spectral lines and reduce the spectral resolution. In order to achieve high-quality two-dimensional imaging spectroscopy, it is necessary to calibrate the centre wavelength and bandwidth of the F-P filter, i.e., to calibrate the cavity length and flat plate parallelism of the F-P filter. In this thesis, the calibration method of F-P filter is investigated, including two parts: cavity length and parallelism. Among them, the cavity length calibration takes advantage of the periodicity of the intensity modulation curve of the F-P filter and the difference between the peaks in the dual-wavelength intensity modulation curve, establishes the correspondence between the controller value and the cavity length of the filter, and realises the wavelength calibration according to the correspondence between the cavity length and the wavelength. The parallelism calibration uses the difference of controller values in different regions to find out the difference value of cavity length, and then finds the inclination angle according to the difference value of cavity length to realise the parallelism calibration. The F-P filter calibration system is developed, and the calibration experiment and error analysis are carried out in the laboratory. Carry out the stability experiment of F-P filter. The results of the calibration experiments show that the wavelength calibration accuracy of the F-P filter is better than 0.0095Å for the actual observation of the H solar spectral lines; the parallelism of the x and y directions of the F-P filter flat plate is 0.2785” and 0.3626”, and the calibration accuracy is 0.010”, respectively, 0.011”; the half-height full widths of M1、M2、M1'、M2' were obtained by two methods as 0.03285968Å, 0.03548539Å, 0.03284920Å, 0.03547363Å; and 0.04572411Å, respectively, 0.04735554Å, 0.04712768Å, 0.04856849Å, which fully meet the requirements for the use of the NVST two-dimensional imaging spectroscopy observing system and verify the feasibility of the calibration method. The stability of the F-P filter is investigated in a laboratory environment. The results show that: the unit step length gradually increases with the increase of the controller value, and the unit step length changes randomly with the temperature change; the wavelength half-height full width gradually decreases with the increase of the controller value, and the wavelength half-height full width changes randomly with the temperature change; the controller value corresponding to the peak position is related to the direction of scanning, and it gradually increases with the number of scans when the direction of scanning is the same and the trend of the increase of each peak is basically the same.
学科领域	天文学
学科门类	工学 ; 工学::电子信息
页数	0
语种	中文
文献类型	学位论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/28052
专题	天文技术实验室
作者单位	中国科学院云南天文台
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	朱瑾. Fabry-Perot滤光器定标方法的研究[D]. 北京. 中国科学院大学,2024.

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