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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吉林 长春,130033
[ "李大禹(1979-),男,吉林长春人,博士,副研究员,硕士生导师,主要从事液晶自适应光学波前处理、GPU并行计算等方面的研究。" ]
收稿日期:2015-08-09,
修回日期:2015-09-17,
纸质出版日期:2016-05-05
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李大禹,. 基于多GPU的液晶自适应光学波前处理器[J]. 液晶与显示, 2016,31(5): 491-496
LI Da-yu,. Liquid crystal adaptive optics wavefront processor based on multi-GPU[J]. , 2016,31(5): 491-496
李大禹,. 基于多GPU的液晶自适应光学波前处理器[J]. 液晶与显示, 2016,31(5): 491-496 DOI: 10.3788/YJYXS20163105.0491.
LI Da-yu,. Liquid crystal adaptive optics wavefront processor based on multi-GPU[J]. , 2016,31(5): 491-496 DOI: 10.3788/YJYXS20163105.0491.
为了满足4 m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4 m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4 m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18
s
Zernike系数拟合延迟39
s
校正器灰度图计算延迟114
s。多GPU下总的波前处理延迟171
s
小于哈特曼探测器采样时间500
s
液晶自适应光学系统-3 dB残余误差抑制带宽可达53 Hz。满足4 m天文望远镜的应用要求。
In order to meet the wavefront processing requirements of liquid crystal adaptive optics system which match 4 m astronomy telescope
a wavefront processor (LCWP) based on multi-GPU is developed. First
the liquid crystal adaptive optics wavefront processing method is described. The numbers of hartmann detector's microlenses
Zernike modes and liquid crystal corrector's drive unit are analyzed
which need to match 4 m telescope. Then the wavefront processing methods based on multi-GPU are discussed in detail: single GPU method is used to calculate slope; block-column distribution method is used to fit Zernike coefficient; Zernike polynomial symmetry algorithm and block-row distribution method are used to compute gray map of liquid crystal corrector. Finally
the transfer function of liquid crystal adaptive optics system for matching 4 m telescope is analyzed and magnitude of the residual error transfer function is simulated. The latency of slope calculation is 18
s
the latency of Zernike coefficient fitting is 39
s and the latency of computing gray map is 114
s. The total computing latency is 109
s and temporal band width in our liquid crystal adaptive optics system is 53 Hz. It is shown that our LCWP based on multi-GPU has the ability to match 4 m astronomy telescope.
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宣丽,李大禹,刘永刚. 液晶自适应光学在天文学研究中的应用展望[J]. 液晶与显示, 2015,30(1):1-9. XUAN L, LI D Y, LIU Y G. Prospect of liquid crystal adaptive optics in astronomy application[J]. Chinese Journal of Liquid Crystals and Displays, 2015, 30(1):1-9.
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贾建禄,王建立,赵金宇,等. 基于FPGA的自适应光学系统波前处理机[J]. 光学精密工程, 2011,19(8):1716-1722. JIA J L, WANG J L, ZHAO J Y,et al. Adaptive optical wave-front processor based on FPGA[J]. Optics and Precision Engineering, 2011, 19(8):1716-1722. (in Chinese)
TRUONG T N, BOUCHEZ A H, DEKANY R G,et al. Real-time wavefront control for the PALM-3000 high order adaptive optics system[C]. Proceedings of the SPIE 7015, Adaptive Optics Systems, Marseille, France:SPIE, 2008, 7015:70153I.
李大禹,胡立发,穆全全,等. 基于GPU的液晶自适应光学波前重构计算[J]. 光子学报, 2008,37(8):1643-1647. LI D Y, HU L F, MU Q Q,et al. Wavefront reconstruction calculation of liquid crystal adaptive optics based on GPU[J]. Acta Photonica Sinica, 2008, 37(8):1643-1647. (in Chinese)
李大禹,胡立发,穆全全,等. GPU计算液晶自适应光学波前重构的并行性研究[J]. 液晶与显示, 2007,22(5):572-575. LI D Y, HU L F, MU Q Q,et al. Wavefront reconstruction parallel computing of liquid crystal adaptive optics based on GPU[J]. Chinese Journal of Liquid Crystals and Displays, 2007, 22(5):572-575. (in Chinese)
李大禹,胡立发,穆全全,等. CUDA架构下的液晶自适应波面数值解析[J]. 光学精密工程, 2010,18(4):848-854. LI D Y, HU L F, MU Q Q,et al. Wavefront calculation of liquid crystal adaptive optics based on CUDA[J]. Optics and Precision Engineering, 2010, 18(4):848-854. (in Chinese)
LI D Y, HU L F, MU Q Q,et al. Wavefront processor for liquid crystal adaptive optics system based on Graphics Processing Unit[J]. Optics Communications, 2014, 316:211-216.
LIU C, HU L F, MU Q Q,et al. Open-loop control of liquid-crystal spatial light modulators for vertical atmospheric turbulence wavefront correction[J]. Applied Optics, 2011, 50(1):82-89.
DAI G M. Modal wave-front reconstruction with Zernike polynomials and Karhunen-Love functions[J]. Journal of the Optical Society of America A, 1996, 13(6):1218-1225.
HARRIS M. Optimizing parallel reduction in CUDA[EB/OL]. http://developer.download.nvidia.com/asserts/cuda/files/reduction.pdf.
PENG Z H, LIU Y G,YAO L S, et al. Improvement of the switching frequency of a liquid-crystal spatial light modulator with optimal cell gap[J]. Optics Letters, 2011, 36(18):3608-3610.
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