基于多GPU的液晶自适应光学波前处理器

发布时间：2018-03-04 16:40

本文选题：图形处理器　切入点：液晶　出处：《液晶与显示》2016年05期 　论文类型：期刊论文

【摘要】：为了满足4m天文望远镜液晶自适应光学系统的波前处理要求,研究了基于多GPU的波前处理器。介绍了液晶自适应光学波前处理方法。分析了用于匹配4m望远镜的哈特曼探测器数目、Zernike模式数和液晶校正器驱动单元数。详细论述了多GPU下波前处理方法,包括:单GPU下计算斜率;按列分块法拟合Zernike系数;Zernike对称性算法和按行分块法计算液晶校正器灰度图。最后,分析了匹配4m望远镜的液晶自适应光学系统的残余误差传递函数,并由此模拟了残余误差传递函数的幅频响应。实验结果表明,斜率计算延迟18μs,Zernike系数拟合延迟39μs,校正器灰度图计算延迟114μs。多GPU下总的波前处理延迟171μs,小于哈特曼探测器采样时间500μs,液晶自适应光学系统-3dB残余误差抑制带宽可达53Hz。满足4m天文望远镜的应用要求。
[Abstract]:In order to meet the requirement of wavefront processing of 4m telescope liquid crystal adaptive optical system, The wavefront processor based on multiple GPU is studied. The method of adaptive optical wavefront processing of liquid crystal is introduced. The number of Hartmann detectors for matching 4m telescope and the number of driving units of liquid crystal corrector are analyzed in detail. In this paper, the method of wave front processing under multiple GPU is described. It includes: calculating slope under single GPU, fitting Zernike coefficient Zernike symmetry algorithm according to column partition method and calculating grayscale map of liquid crystal corrector by row block method. Finally, the residual error transfer function of liquid crystal adaptive optical system matching 4m telescope is analyzed. The amplitude-frequency response of residual error transfer function is simulated. The slope calculation delay of 18 渭 s / s Zernike coefficient fitting delay is 39 渭 s, and the delay of correction is 114 渭 s. The total wavefront processing delay at multiple GPU is 171 渭 s, which is less than 500 渭 s of Hartmann detector sampling time. The residual error suppression bandwidth of the liquid crystal adaptive optical system -3dB can be achieved. 53Hz. meet the application requirements of 4m astronomical telescope.
【作者单位】：中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室;
【基金】：国家自然基金项目(No.61405194)~~
【分类号】：O439;TH751

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