High precision tracking method for solar telescopes
Jingjing Guo, Yunfei Yang, Song Lin Feng, Kanfan Ji, Jiaben Lin, Zhen Zeng, Bingxiang Wang · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2016
A high-precision real-time tracking method for solar telescopes was introduced in this paper based on the barycenter of full-disk solar images algorithm. To make sure the calculation was accurate and reliable, a series of strictly logic limits were set, such as setting gray threshold, judging the displacement of the barycenter and measuring the deviation from a perfect disk. A closed-loop control system was designed in the method. We located the barycenter of the full-disk images which recorded by large array CCD image sensor in real time and eliminate noise caused by bad weather, such as clouds and fog. The displacement of the barycenter was analyzed and transferred into control signal drove the motor to adjust the axis of telescope. An Ethernet interface was also provided for remote control. In the observation, the precision of this new method was better than 1″/30 minutes.