Systematic calibration of a 2-m Ring Solar Telescope based on local interferometry and model comparison

分类： 天文学 >> 天文仪器与技术 提交时间： 2025-06-03 合作期刊: 《Astronomical Techniques and Instruments》

Renai Liu Jinpeng Li Zuozifei Song Changyu Zeng Yichun Dai

摘要： To address the installation challenges of a 2-m ring Gregorian telescope system, and similar optical systems with a small width-to-radius ratio, we propose a detection method combining local interferometry with a comparison model. This method enhances the precision of system calibration by establishing a dataset that delineates the relationship between secondary mirror misalignment and wavefront aberration, subsequently inferring the misalignment from interferometric detection results during the calibration process. For the 2-m ring telescope, we develop a detection model using five local sub-apertures, enabling a root-mean-square detection accuracy of 0.0225λ ( λ= 632.8 nm) for full-aperture wavefront aberration. The calibration results for the 2-m Ring Solar Telescope system indicate that the root-mean-square value of sub-aperture wavefront aberration reaches 0.104λ , and the root-mean-square value of spliced full-aperture measurement yields reaches 0.112λ. This method offers a novel approach for calibrating small width-toradius ratio telescope systems and can be applied to the calibration of other irregular-aperture optical systems.

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