基于兴隆观测基地50cm望远镜的幸运成像系统

Lucky imaging system on the 50 cm telescope at Xinglong observatory

大气湍流会在很大程度上降低地基望远镜的空间分辨率,而幸运成像技术以较低的成本、简单的设备、易实现的算法可以有效修正大气湍流的影响,从而提高了地基望远镜开展天体成像和密集星场高精度测光观测的能力。基于兴隆观测基地50 cm望远镜研制了幸运成像系统,该系统包括滤光片、望远镜增焦子系统、数据采集子系统和数据处理子系统。在视宁度良好的晴夜对月球、大行星、球状星团和双星进行了观测,成功获取了月球表面的清晰图像,恒星星像的半高全宽(FWHM)达到0.6″,好于2倍望远镜衍射极限。观测结果表明,该幸运成像系统能够有效提高地基望远镜的空间分辨本领,为下一步的高分辨天文观测研究奠定了基础。

The spatial resolution of ground-based telescopes was greatly limited by the effects of atmospheric turbulence. Lucky imaging can efficiently reduce the blurring effects of atmospheric turbulence with low cost, uncomplicated instrument and easy actualizing solution. Lucky imaging system is based on the 50 cm telescope at Xinglong Observatory. It consists of filters, subsystem of barlow lens which increases the focal length of telescope, subsystem of data acquisition and subsystem of data reduction. The moon, globular clusters and close binary stars were observed in good seeing conditions, by using the lucky imaging system. Sharp images of the lunar surface, and FWHM of 0.6 ″ of stars which is two times better than the diffraction of the 50 cm telescope were obtained successfully. The experimental results show that this system can greatly improve the spatial resolution of ground-based telescopes, and it would play an important role in subsequent high resolution astronomical observations.