Wave-front sensing from defocused images by use of wave-front slopes.
Wave-front sensing from defocused images by use of wave-front slopes.
复制标题
利用波前斜率从散焦图像进行波前传感。
作者：
M. V. van Dam;R. Lane
我们描述了一种从两个离焦强度测量中获得波前像差的新技术。强度定义了一个概率密度函数，该方法是基于强度的累积密度函数随光的传播而演变的。在一维中，这个问题很容易用直方图规范过程来解决，波前斜率与直方图横坐标的差值之间存在线性关系。在二维情况下，该方法需要使用Radon变换。模拟结果表明，每个探测器可以获得低至100个光子的良好重建效果。此外，该方法对孔径处的闪烁不敏感。
We describe a novel technique for deriving wave-front aberrations from two defocused intensity measurements. The intensity defines a probability density function, and the method is based on the evolution of the cumulative density function of the intensity with light propagation. In one dimension, the problem is easily solved with a histogram specification procedure, with a linear relationship between the wave-front slope and the difference in the abscissas of the histograms. In two dimensions, the method requires use of a Radon transform. Simulation results demonstrate that good reconstructions can be attained down to 100 photons in each detector. In addition, the method is insensitive to scintillation at the aperture.