Ground flat-field calibration of a space astronomical telescope using a spatial time-sharing calibration method

doi:10.1364/AO.498846

CIOMP OpenIR

	Ground flat-field calibration of a space astronomical telescope using a spatial time-sharing calibration method
	J. Zheng, X. He, N. Zhang, J. Xian and X. Zhang
	2023
发表期刊	Applied Optics
ISSN	1559128X
卷号	62 期号:30 页码:7938-7951
摘要	Preflight ground flat-field calibration is significant to the development phase of space astronomical telescopes. The uniformity of the flat-field illumination reference source seriously decreases with the increasing aperture and the telescope’s field of view, directly affecting the final calibration accuracy. To overcome this problem, a flat-field calibration method that can complete calibration without a traditional flat-field illumination reference source is proposed on the basis of the spatial time-sharing calibration principle. First, the characteristics of the flat field in the spatial domain taken by the space astronomical telescope are analyzed, and the flat field is divided into large-scale flat (L-flat) and pixel-to-pixel flat (P-flat). They are then obtained via different calibration experiments and finally combined with the data fusion process. L-flat is obtained through star field observations and the corresponding L-flat extraction algorithm, which can obtain the best estimation of L-flat based on numerous photometry samples, thereby effectively improving calibration accuracy. The simulation model of flat-field calibration used for accuracy analysis is established. In particular, the error sources or experimental parameters that affect the accuracy of L-flat calibration are discussed in detail.Results of the accuracy analysis showthat the combined uncertainty of the proposed calibration method can reach 0.78%. Meanwhile, experiments on an optic system with a Φ142 mmaperture are performed to verify the calibration method.Results demonstrate that theRMSvalues of the residual map are 0.720%, 0.565%, and 0.558% at the large-, middle-, and small-scale, respectively. The combined calibration uncertainty is 0.88%, which is generally consistent with the results of the accuracy analysis. © 2023 Optica Publishing Group.
DOI	10.1364/AO.498846
URL	查看原文
收录类别	sci ; ei
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/68254
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. Zheng, X. He, N. Zhang, J. Xian and X. Zhang. Ground flat-field calibration of a space astronomical telescope using a spatial time-sharing calibration method[J]. Applied Optics,2023,62(30):7938-7951.
APA	J. Zheng, X. He, N. Zhang, J. Xian and X. Zhang.(2023).Ground flat-field calibration of a space astronomical telescope using a spatial time-sharing calibration method.Applied Optics,62(30),7938-7951.
MLA	J. Zheng, X. He, N. Zhang, J. Xian and X. Zhang."Ground flat-field calibration of a space astronomical telescope using a spatial time-sharing calibration method".Applied Optics 62.30(2023):7938-7951.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Ground flat-field ca（36661KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览下载