Transverse wind measurement with Shack-Hartmann wavefront sensor

doi:10.1109/CompComm.2017.8323033

CORC > 光电技术研究所 > 中国科学院光电技术研究所 > 自适应光学技术研究室（八室）

	Transverse wind measurement with Shack-Hartmann wavefront sensor
	Li, Zhenghan 1,2,3; Li, Xinyang 1,2
	2018-03-22
会议日期	December 13, 2017 - December 16, 2017
会议地点	Chengdu, China
关键词	Adaptive control systems Atmospheric thermodynamics Atmospheric turbulence Delay control systems Errors Estimation Optical flows Real time systems Spurious signal noise Wavefronts
DOI	10.1109/CompComm.2017.8323033
页码	2745-2751
英文摘要	Velocity and direction of transverse wind are important parameters of atmospheric turbulence, largely determining the future wavefront pattern. Real time wind estimation contributes to predictive correction which is used to compensate for the time delay in the control systems of adaptive optics (AO) system. This paper presents two methods to estimate the transverse wind from wavefront reconstructed with Zernike modal using Shack-Hartmann wavefront sensor (SHWS). We compare the performances of block match method and optical flow method, as well as presenting a comprehensive error analysis. It is showed that the transverse wind estimation error will be minimum while optimal mode numbers were chosen. For both methods, the percent deviation of velocity estimation are kept within 30%, and the estimation error of wind direction are kept within 6 degree. The variances of the two methods increase with the slope measurement noise variances increasing. When the slope measurement noise is around 1 pixel, the variance of the transverse wind estimation approaches to theoretical lower bound, which indicates the estimation methods are efficient. According to the minimum estimation deviation, the optical flow method is preferable. Numerical results are used to verity the conclusions. © 2017 IEEE.
会议录	2017 3rd IEEE International Conference on Computer and Communications, ICCC 2017
文献子类	C
语种	英语
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/9121]
专题	光电技术研究所_自适应光学技术研究室（八室）
作者单位	1.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China; 2.Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu; 610209, China; 3.University of Chinese Academy of Sciences, Beijing; 100039, China
推荐引用方式 GB/T 7714	Li, Zhenghan,Li, Xinyang. Transverse wind measurement with Shack-Hartmann wavefront sensor[C]. 见:. Chengdu, China. December 13, 2017 - December 16, 2017.