Optical misalignment sensing for optical aperture synthesis telescope by using phase diversity

Fang Cao; Yongtian Zhu; Zhen Wu

doi:10.1117/12.786901

16 July 2008 Optical misalignment sensing for optical aperture synthesis telescope by using phase diversity

Fang Cao, Yongtian Zhu, Zhen Wu

Proceedings Volume 7015, Adaptive Optics Systems; 70154Q (2008) https://doi.org/10.1117/12.786901
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

An optical aperture synthesis telescope such as the LBT will suffer from phase errors unless the apertures are aligned to within a small fraction of a wavelength. A phase diversity wave-front sensor can measure phase errors brought by a misaligned aperture synthesis telescope. The Phase Diversity is formulated in the context of nonlinear programming where a metric is developed and then minimized. We here introduce a novel Genetic Algorithms (GAs), evaluate the different Zernike coefficients to obtain the wave-front error. The results of the computer simulations performed with simulated data including the effects of noise are shown for the case of random misalignment phase errors on each of three sub-telescope.

Citation Download Citation

Fang Cao, Yongtian Zhu, and Zhen Wu "Optical misalignment sensing for optical aperture synthesis telescope by using phase diversity", Proc. SPIE 7015, Adaptive Optics Systems, 70154Q (16 July 2008); https://doi.org/10.1117/12.786901

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