From Event: SPIE Optical Engineering + Applications, 2017
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.
Heejoo Choi, Isaac Trumper, Matthew Dubin, Wenchuan Zhao, and Dae Wook Kim, "Simultaneous angular alignment of segmented mirrors using sinusoidal pattern analysis," Proc. SPIE 10377, Optical System Alignment, Tolerancing, and Verification XI, 103770G (Presented at SPIE Optical Engineering + Applications: August 06, 2017; Published: 22 August 2017); https://doi.org/10.1117/12.2275197.
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