Changchun Institute of Optics,Fine Mechanics and Physics,CAS
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
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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. |
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