A Digital Holographic Approach for Co-Phasing of Segmented Telescopes: Proof of Concept Using Numerical Simulations

A Digital Holographic Approach for Co-Phasing of Segmented Telescopes: Proof of Concept Using Numerical Simulations
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分段望远镜同相的数字全息方法:使用数值模拟进行概念验证

DOI:
10.1086/675973
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发表时间:
2014-03
影响因子:
3.5
通讯作者:
Zhang Sijiong
Zhang Sijiong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li Changwei;Zhang Sijiong

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提出了用双波长数字全息术实现分段望远镜的在线共相位。采用两幅数字全息图(每波长一幅),通过数字全息方法获得了较长合成波长下分段望远镜的相位。全息图由高速CCD相机使用点衍射马赫-曾德干涉仪记录。通过对望远镜各段的合成波长相位进行平面拟合,可以得到各段的活塞系数和倾斜系数。为了验证该方法的可行性,以两台37个六边形分段的模拟望远镜为例,在存在大气湍流和探测噪声的情况下,对共相位分段望远镜进行了数字全息检验。数值模拟表明,双波长数字全息方法用于分段望远镜的共相位是可行的,具有高精度和鲁棒性。
Online co-phasing of segmented telescopes by dual-wavelength digital holography is proposed. Two digital holograms (one hologram per wavelength) are employed to get the phase of the segmented telescope for a longer synthetic wavelength by the digital holographic approach. The holograms are recorded by a high-speed CCD camera using the point-diffraction Mach-Zehnder interferometer. By fitting the plane for the synthetic wavelength phase in each segment of the telescope, the coefficients of piston and tip/tilt for each segment can be acquired. To test the feasibility of the proposed method, two simulated telescopes with 37 hexagonal segments are taken as examples to examine co-phasing segmented telescopes by digital holography when atmospheric turbulence and detection noises exist. Numerical simulations show that the dual-wavelength digital holographic approach for co-phasing of segmented telescopes is feasible and highly accurate and robust.
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