Journal ArticleDOI
A Tilt-Correction Adaptive Optical System for the Solar Telescope of Nanjing University
Changhui Rao,Wenhan Jiang,Cheng Fang,Ning Ling,Weichao Zhou,Mingde Ding,Xuejun Zhang,Donghong Chen,Mei Li,Xiu-Fa Gao,Tian Mi +10 more
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TLDR
A tilt-correction adaptive optical system installed on the 430 mm solar telescope of Nanjing University has been put in operation as discussed by the authors. But the system is not suitable for large-scale observations.Abstract:
A tilt-correction adaptive optical system installed on the 430 mm Solar Telescope of Nanjing University has been put in operation. It consists of a tip-tilt mirror, a correlation tracker and an imaging CCD camera. An absolute difference algorithm is used for detecting image motion in the correlation tracker. The sampling frequency of the system is 419 Hz. We give a description of the system's configuration, an analysis of its performance and a report of our observational results. A residual jitter of 0.14 arcsec has been achieved. The error rejection bandwidth of the system can be adjusted in the range 5–28 Hz according to the beacon size and the strength of atmospheric turbulence.read more
Citations
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Journal ArticleDOI
INSTRUMENT DESCRIPTION AND PERFORMANCE EVALUATION OF A HIGH-ORDER ADAPTIVE OPTICS SYSTEM FOR THE 1 m NEW VACUUM SOLAR TELESCOPE AT FUXIAN SOLAR OBSERVATORY
Changhui Rao,Lei Zhu,Xuejun Rao,Zhang Lanqiang,Hua Bao,Lin Kong,Youming Guo,Libo Zhong,Xue' An Ma,Mei Li,Cheng Wang,Xiaojun Zhang,Xinlong Fan,Donghong Chen,Zhongyi Feng,Naiting Gu,Yangyi Liu +16 more
TL;DR: In this article, a high-order solar adaptive optics (AO) system including a fine tracking loop and a highorder wavefront correction loop has been installed at the 1 m New Vacuum Solar Telescope of the Fuxian Solar Observatory, in routine operation since 2016.
Journal ArticleDOI
Performance of the 37-element solar adaptive optics for the 26 cm solar fine structure telescope at Yunnan Astronomical Observatory
TL;DR: In this article, a 37-element solar adaptive optics system, which consists of a fine tracking loop with a tip/tilt mirror and a correlation tracker, and a high-order correction loop, was built and installed at the 26 cm solar fine structure telescope of the Yunnan Astronomical Observatory in 2009.
Journal ArticleDOI
1.8-m solar telescope in China: Chinese Large Solar Telescope
Changhui Rao,Naiting Gu,Lei Zhu,Huang Jinlong,Cheng Li,Yuntao Cheng,Yangyi Liu,Xuedong Cao,Ming Zhang,Zhang Lanqiang,Hong Liu,Yongjian Wan,Hao Xian,Wenli Ma,Hua Bao,Xiaojun Zhang,Chunlin Guan,Donghong Chen,Mei Li +18 more
TL;DR: The Chinese Large Solar Telescope (CLST) as mentioned in this paper is a classic Gregorian configuration telescope with an open structure, alt-azimuth mount, retractable dome, and a large mechanical de-rotator.
Journal ArticleDOI
First generation solar adaptive optics system for 1-m New Vacuum Solar Telescope at Fuxian Solar Observatory
Changhui Rao,Lei Zhu,Xuejun Rao,Zhang Lanqiang,Hua Bao,Xue’an Ma,Naiting Gu,Chunlin Guan,Dong-Sheng Chen,Cheng Wang,Jun Lin,Zenyu Jin,Zhong Liu +12 more
TL;DR: The first generation solar adaptive optics (AO) system, which consists of a fine tracking loop with a tip-tilt mirror (TTM) and a correlation tracker, and a high-order correction loop with the 37-element deformable mirror (DM), a correlating Shack-Hartmann (SH) wavefront sensor (WFS) based on the absolute difference algorithm and a real time controller (RTC), has been developed and installed at the 1m New Vacuum Solar Telescope (NVST) that is part of Fuxian Solar Observatory (FSO) RE
Proceedings ArticleDOI
First observations on the 127-element adaptive optical system for 1.8m telescope
Changhui Rao,Kai Wei,Kai Wei,Xuejun Zhang,Xuejun Zhang,Ang Zhang,Yudong Zhang,Hao Xian,Luchun Zhou,Chunlin Guan,Mei Li,Donghong Chen,Shanqiu Chen,Yu Tian,Zhou Liao +14 more
TL;DR: In this article, the first observations on the high resolution imaging for the stars had been done from September 23 2009 in the first light to March 2010, and the results showed the angular resolution of the system can reach or approach the diffraction limit of 1.8m at I band (700nm-1000nm) and J band (1000nm-1700nm).
References
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Proceedings ArticleDOI
Solar adaptive optics at the National Solar Observatory
TL;DR: The National Solar Observatory at Sacramento Peak as discussed by the authors developed adaptive optics for solar astronomy using a correlating Shack-Hartmann wavefront sensor and applied correlation techniques to images of extended objects, such as granulation, probes and sunspots.
Journal ArticleDOI
Performance analysis for T.H.E.M.I.S* image stabilizer optical system. I. (*)Télescope Héliographique pour l'Etude du Magnétisme et des Instabilités de l'atmosphère Solaire
TL;DR: In this paper, the performance of the optical image stabilizer system developed for the franco-Italian T.H.I.M.E.S. telescope, which is currently being built on the Canary Island Tenerife, is described.
Proceedings ArticleDOI
Correlation tracking algorithms for low-contrast extended object
TL;DR: Based on the principle of correlation tracking algorithm, the effectiveness of cross correlation coefficient and absolute difference algorithms for the low contrast extended objects such as solar granulation and the sunspot is studied as mentioned in this paper.
Proceedings ArticleDOI
Tilt-correction adaptive optical system for Solar Telescope of Nanjing University
Changhui Rao,Wenhan Jiang,Cheng Fang,Ning Ling,Weichao Zhou,Mingde Ding,Xuejun Zhang,Donghong Chen,Mei Li,Xiu-Fa Gao,Tian Mi +10 more
TL;DR: In this article, a tilt-correction adaptive optical system installed at the 430mm solar telescope at Nanjing University has been in operation, which is made up of a tip-tile mirror, a correlation tracker and an imaging CCD camera.
Tracking algorithm for low contrast extended object
TL;DR: For the low contrast extended objects such as solar granulation and the sunspot, the effectiveness of the cross-correlation coefficient and the absolute difference algorithms is studied in this paper.