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Investigation of Thirty Meter Telescope Wavefront Maintenance Using Low Order Shack-Hartmann Wavefront Sensors to Correct for Thermally Induced Misalignments
Wavefront Sensing and Control Active Optics On-Instrument Wavefront Sensor
2015/5/13
We evaluate how well the performance of the Thirty Meter Telescope (TMT) can be maintained against thermally
induced errors during a night of observation. We first demonstrate that using look-u...
为提高Shack-Hartmann(S-H)波前传感器的光斑质心探测精度,在分析质心探测误差来源的基础上,提出基于模板匹配的探测窗口选取方法和基于单个光斑的自适应阈值选取方法,将这两种方法与加权质心算法相结合求取质心,提高了质心探测精度。与固定阈值和传统质心算法相比较,当SNR 大于3 时,质心探测精度平均提高了约40%。将文中的方法应用于可见光波段的商品S-H 波前传感器,实验表明:文中方法得到...
高帧频Shack-Hartmann波前传感器常用于自适应光学系统中实时探测光束的动态波前误差,其输出信号必须由高速波前处理机进行处理和运算。结合61单元自适应光学系统中采样频率为2900Hz的hack-Hartmann波前传感器的特点,讨论了采用高帧频Shack-Hartmann探测的自适应光学系统的实时波前处理方法。