The research of Space Solar Telescope is consisted of three aspects, the BalloonBorne and Ground-Mobile Solar Telescope which is a preparing project for the Space Solar Telescope, Space Solar Telescope and researches ...The research of Space Solar Telescope is consisted of three aspects, the BalloonBorne and Ground-Mobile Solar Telescope which is a preparing project for the Space Solar Telescope, Space Solar Telescope and researches of solar magnetic field and velocity field. Thess are separately introduced in this paper.展开更多
针对用于太阳磁场精确测量的中红外观测系统(Accurate Infrared Magnetic field measurements of the Sun,AIMS)太阳望远镜地平式机架在跟踪目标时像场旋转的现象,研究了像场旋转对稳像系统校正精度的影响。首先理论分析了互相关因子算...针对用于太阳磁场精确测量的中红外观测系统(Accurate Infrared Magnetic field measurements of the Sun,AIMS)太阳望远镜地平式机架在跟踪目标时像场旋转的现象,研究了像场旋转对稳像系统校正精度的影响。首先理论分析了互相关因子算法和绝对差分算法在不同湍流强度及不同探测窗口大小时由像场旋转引起的计算误差。随后在光学分析软件ASAP(Advanced Systems Analysis Program)中建立了包含装配误差的望远镜系统动态光学模型,统计了折轴系统装配误差在望远镜实时跟踪太阳运动时引起的像场平移及旋转。其中,图像在半小时内的最大平移约为0.3 mm,最大像旋约为200″。结果表明,在现有的误差分配情况下,装配误差引起的像旋对稳像精度的影响很小,而为了获得较高的稳像精度,互相关因子算法是首选的稳像算法,且在硬件处理速度允许的情况下,应该选择128×128像素的探测窗口。展开更多
Polarization calibration unit（PCU） has become an indispensable element for solar telescopes to remove the instrumental polarization; the polarimetric accuracy of calibration depends strongly on the properties of PCU...Polarization calibration unit（PCU） has become an indispensable element for solar telescopes to remove the instrumental polarization; the polarimetric accuracy of calibration depends strongly on the properties of PCU. In the paper, we analyze the measurement errors induced by PCU based on polarized light theory and find that the imperfections of the waveplate generate the main calibration errors. An optimized calibration method is proposed to avoid the effects from waveplate imperfections, and a numerical simulation is given to evaluate the polarization accuracy by analyzing the relation between calibration error and intensity instability. The work is very important for solar telescopes with high polarization precision up to 10^（-4） I_c.展开更多
中国1.8 m太阳望远镜(Chinese large solar telescope,CLST)致力于对太阳偏振的高精度及高灵敏度测量。然而其系统本身会引入仪器偏振,并且在望远镜运行的过程中,仪器偏振会随其指向的变化而变化。这就降低了系统的测量精度。因此,需要...中国1.8 m太阳望远镜(Chinese large solar telescope,CLST)致力于对太阳偏振的高精度及高灵敏度测量。然而其系统本身会引入仪器偏振,并且在望远镜运行的过程中,仪器偏振会随其指向的变化而变化。这就降低了系统的测量精度。因此,需要一个偏振标定单元对其仪器偏振进行标定。为此,本文对偏振标定的原理和方法进行了研究,并且给出了针对CLST的偏振标定单元设计方案。展开更多
文摘The research of Space Solar Telescope is consisted of three aspects, the BalloonBorne and Ground-Mobile Solar Telescope which is a preparing project for the Space Solar Telescope, Space Solar Telescope and researches of solar magnetic field and velocity field. Thess are separately introduced in this paper.
文摘针对用于太阳磁场精确测量的中红外观测系统(Accurate Infrared Magnetic field measurements of the Sun,AIMS)太阳望远镜地平式机架在跟踪目标时像场旋转的现象,研究了像场旋转对稳像系统校正精度的影响。首先理论分析了互相关因子算法和绝对差分算法在不同湍流强度及不同探测窗口大小时由像场旋转引起的计算误差。随后在光学分析软件ASAP(Advanced Systems Analysis Program)中建立了包含装配误差的望远镜系统动态光学模型,统计了折轴系统装配误差在望远镜实时跟踪太阳运动时引起的像场平移及旋转。其中,图像在半小时内的最大平移约为0.3 mm,最大像旋约为200″。结果表明,在现有的误差分配情况下,装配误差引起的像旋对稳像精度的影响很小,而为了获得较高的稳像精度,互相关因子算法是首选的稳像算法,且在硬件处理速度允许的情况下,应该选择128×128像素的探测窗口。
基金supported by the National Natural Science Foundation of China(Grant Nos.11403047,11427901,11178005,11373044,11273034,and 11373042)
文摘Polarization calibration unit（PCU） has become an indispensable element for solar telescopes to remove the instrumental polarization; the polarimetric accuracy of calibration depends strongly on the properties of PCU. In the paper, we analyze the measurement errors induced by PCU based on polarized light theory and find that the imperfections of the waveplate generate the main calibration errors. An optimized calibration method is proposed to avoid the effects from waveplate imperfections, and a numerical simulation is given to evaluate the polarization accuracy by analyzing the relation between calibration error and intensity instability. The work is very important for solar telescopes with high polarization precision up to 10^（-4） I_c.
文摘中国1.8 m太阳望远镜(Chinese large solar telescope,CLST)致力于对太阳偏振的高精度及高灵敏度测量。然而其系统本身会引入仪器偏振,并且在望远镜运行的过程中,仪器偏振会随其指向的变化而变化。这就降低了系统的测量精度。因此,需要一个偏振标定单元对其仪器偏振进行标定。为此,本文对偏振标定的原理和方法进行了研究,并且给出了针对CLST的偏振标定单元设计方案。
