论文标题
高对比度成像的精确斑点图案重建
Precision speckle pattern reconstruction for high contrast imaging
论文作者
论文摘要
在高对比度成像中，为减少残留斑点噪声并提高检测能力而做出了大型仪器，技术和算法的努力。在这项工作中，我们探讨了使用斑点图像的精确物理描述以及最佳检测统计量来执行高对比度成像的潜力。我们的方法使用短曝光斑点图像，使用相检索算法重建每个图像的点扩散函数（PSF）。使用重建的PSF，我们计算所有图像的最佳检测统计量。我们分析了由于使用了重建的PSF而导致的偏差，并完全纠正了它的累积，直至其$ 10^4 $图像的积累。我们在模拟中测量该方法由于重建过程中过度拟合而导致的敏感性损失，并达到估计的5 $σ$检测极限为$ 5 \ times 10^{ - 7} $通量比在$ 0.1 -0.5^{\ prime \ prime} $ $ 0.1 -0.5^{\ prime \ prime} $的$ 1H $ 1H $ 1H $ 1H $ 1H $ 1H $ 1H $ 2M-prime} $的情况下。
In High Contrast Imaging, a large instrumental, technological and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal detection statistic to perform High Contrast Imaging. Our method uses short-exposure speckle images, reconstructing the Point Spread Function (PSF) of each image with phase retrieval algorithms. Using the reconstructed PSF's we calculate the optimal detection statistic for all images. We analyze the arising bias due to the use of a reconstructed PSF and correct for it completely up to its accumulation over $10^4$ images. We measure in simulations the method's sensitivity loss due to overfitting in the reconstruction process and get to an estimated 5$σ$ detection limit of $5\times 10^{-7}$ flux ratio at angular separations of $0.1 -0.5^{\prime\prime}$ for a $1h$ observation of Sirius A with a 2m-telescope.
