太阳能Shack-Hartmann波前传感器像移测量算法的比较分析

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Xiya Wei, Carlos Quintero Noda, Lanqiang Zhang, Changhui Rao
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引用次数: 0

摘要

对太阳的观测提供了对其结构、演化和活动的独特见解,对空间天气预报和太阳能技术具有重要意义。地面望远镜为高分辨率太阳观测提供了经济、灵活的解决方案,但图像质量会受到大气湍流的影响。自适应光学(AO)系统配备了Shack-Hartmann波前传感器(SH-WFS),可以实现实时图像校正,以减轻这些影响。SH-WFS的精度依赖于测量波前移的相关算法,但要就其精度得出一致的结论仍然具有挑战性。在本研究中,我们使用模拟和真实的太阳图像对标准相关算法(平方差函数、归一化互相关、绝对差函数、绝对差函数平方和频域协方差函数(CFF))进行了评估和比较。我们通过预处理技术对算法进行了优化,并精心选择了最适合CFF算法的窗函数。此外,我们还分析了各种因素对算法准确性的影响,如偏移范围、偏差和实时图像的大小。一致的结果表明,CFF算法与其他算法相比具有更好的测量精度和鲁棒性。选择CFF算法进行太阳观测,可以显著提高测量精度、AO系统性能和太阳研究成果的整体质量,为空间天气预报等相关科学领域提供重要支撑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative Analysis of Image-shift Measurement Algorithms for Solar Shack–Hartmann Wavefront Sensors
Abstract Observations of the Sun provide unique insights into its structure, evolution, and activity, with significant implications for space weather forecasting and solar energy technologies. Ground-based telescopes offer cost-effective and flexible solutions for high-resolution solar observations, but image quality can be affected by atmospheric turbulence. Adaptive optics (AO) systems equipped with Shack–Hartmann wave front sensors (SH-WFS) enable real-time image correction to mitigate these effects. The accuracy of SH-WFS relies on correlation algorithms that measure wave front shifts, but reaching consistent conclusions regarding their accuracy remains challenging. In this study, we conducted an evaluation and comparison of standard correlation algorithms (the Square Difference Function, Normalized Cross-Correlation, Absolute Difference Function, Absolute Difference Function-Squared, and the Covariance Function in the frequency domain (CFF)) using simulated and authentic solar images. We optimized the algorithms through pre-processing techniques and carefully selected the most suitable window function for the CFF algorithm. Additionally, we analyzed the influence of various factors, such as shift ranges, bias, and the size of live images on the accuracy of algorithms. The consistent findings revealed that the CFF algorithm demonstrates superior measurement accuracy and robustness compared to the others. Choosing the CFF algorithm for solar observations can significantly enhance measurement accuracy, AO system performance, and the overall quality of solar research findings, thereby providing crucial support for space weather forecasting and other related scientific fields.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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