Co-phasing of segmented mirror telescopes with curvature sensing
Co-phasing of segmented mirror telescopes with curvature sensing
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DOI：
10.1117/12.393930
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发表时间：
2000-08
期刊：
影响因子：
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通讯作者：
V. Orlov;S. Cuevas;F. Garfias;V. Voitsekhovich;L. Sánchez
中科院分区：
文献类型：
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作者：
V. Orlov;S. Cuevas;F. Garfias;V. Voitsekhovich;L. Sánchez
通过对强散焦图像的模拟，研究了曲率法对分块镜共相位的适用性。同时对单色光和白色光进行模拟。对曲率信号进行了简单的波前重构。分析了活塞模的重建质量和四阶像差。本文给出了分段反射镜中心光强比随均方根分段像差的变化关系。分析了双折射引起的畸变对镜同相质量的影响。结果表明，该方法可以直接从曲率信号中测量出局部活塞和局部倾斜角，而不需要任何相位恢复过程。结果表明，即使在大气湍流存在的情况下，曲率法也能灵敏地检测出分块镜的误差。
The applicability of the curvature method for co-phasing of segmented mirrors is investigated by means of simulations for the case of strongly defocused images. The simulations are performed for both the monochromatic and the white light as well. A simple wavefront reconstruction from curvature signal was made. The reconstruction quality of the piston modes and the aberrations up to the fourth order is analyzed. The dependence of the Central Intensity Ratio for a segmented mirror as a function of the rms segment's aberrations is presented. The effect of turbulence-induced distortions on the quality of mirror co-phasing is analyzed. It is shown that the local pistons and the local tip-tilts can be measured directly from the curvature signal without any phase recovering procedure. The results obtained show that, even in the presence of the atmospheric turbulence, the curvature method is sensitive enough to detect the errors of segmented mirrors.