@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 = "Funding Information: This research was made possible in part by the Technology Research Initiative Fund (TRIF) Optics/Imaging Program, through the College of Optical Sciences at the University of Arizona, the Post-processing of Freeform Optics project supported by the Korea Basic Science Institute, and the Friends of Tucson Optics (FoTO) Endowed Scholarships in Optical Sciences. The authors would also like to acknowledge the II-VI Foundation Block-Gift Program for helping support general deflectometry research in the LOFT group. We thank Jake Gardner for his editorial help for this manuscript. 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",
}