论文标题
光学干涉仪图像平面梁组合中的串扰
Crosstalk in image plane beam combination for optical interferometers
论文作者
论文摘要
光学干涉仪中的图像平面束组合将从多个基线的干涉条纹多路复用到单个检测器。星光的光束在组合仪的入口处以非冗余图案排列，以便每个基线的信号可以在频域中彼此分开。如果来自不同基线的信号在频域中重叠，则可能会导致所谓的基线串扰的条纹测量中的系统误差。在本文中，我们量化了由数百米的距离距离距离距离距离近距离的结合而产生的。我们发现，在理想化的条件下，大气波前误差和束传播不会导致串扰。但是，当光束梁列中包含孔径停止时，我们观察到波前误差可能导致串扰高达$ΔV^{2} = 6.6 \ times10^{ - 3} $在现实观察条件下引起的平方可视性误差。
Image plane beam combination in optical interferometers multiplexes the interference fringes from multiple baselines onto a single detector. The beams of starlight are arranged in a non-redundant pattern at the entrance of the combiner so that the signal from each baseline can be separated from one another in the frequency domain. If the signals from different baselines overlap in the frequency domain, this can give rise to a systematic error in the fringe measurements known as baseline crosstalk. In this paper we quantify crosstalk arising from the combination of atmospheric seeing and beam propagation over distances of order hundreds of metres. We find that in idealised conditions atmospheric wavefront errors and beam propagation do not contribute to crosstalk. However, when aperture stops are included in the optical beam train we observe that wavefront errors can result in squared visibility errors arising from crosstalk as high as $ΔV^{2} = 6.6\times10^{-3}$ under realistic observing conditions.
