@inproceedings{c91b1f53c9d64914b5db13856ac7a19c,
title = "Simultaneous angular alignment of segmented mirrors using sinusoidal pattern analysis",
abstract = "A segmented mirror is one of the most promising solutions to build an extremely large aperture telescope to reveal the secrets of the universe. In this manuscript, we present a simultaneous angle alignment method for segmented mirrors. By taking the displayed sinusoidal pattern reflecting off the mirrors, the tip-tilt angles are measured with 0.8 μrad resolution for a flat mirror. Due to the efficient calculation using Fourier analysis, the total measurement time for seven flat mirrors is 0.07 s. In addition, a multiplexed sinusoidal pattern is adapted to resolve the intrinsic 2π ambiguity problem in a sinusoidal signal. The presented method can measure any number of segmented mirrors provided that the camera's field of view can cover them all simultaneously.",
keywords = "Alignment, Angle measurement, Deflectometry, Fourier analysis, Metrology instrumentation, Multi-segmented mirror",
author = "Heejoo Choi and Isaac Trumper and Matthew Dubin and Wenchuan Zhao and Kim, \{Dae Wook\}",
note = "Publisher Copyright: {\textcopyright} 2017 SPIE.; Optical System Alignment, Tolerancing, and Verification XI 2017 ; Conference date: 06-08-2017 Through 07-08-2017",
year = "2017",
doi = "10.1117/12.2275197",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jose Sasian and Youngworth, \{Richard N.\}",
booktitle = "Optical System Alignment, Tolerancing, and Verification XI",
}