From Event: SPIE Optical Engineering + Applications, 2018
The tendency in the manufacture of large telescopes that working in visible light, has improve the manufacture of large mirrors by the use off-axis segments, which must be aligned with very high precision in order of fractions of wavelength for the optimal operation. In this paper we present a new method for alignment segments of a big telescope, where the positions of the images produced by each off-axis segment, of a point source placed at center of curvature, the primary mirror. These positions can be known by exact rays tracing, considering the aberrations produce in each off-axis segment. Consequently, each point source is not on the optical axis of the system. Some numerical simulations are shown to establish the accuracy achieved with the proposed method.
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Fermín S. Granados-Agustín, María E. Percino-Zacarías, Sergio Vázquez y Montiel, and Alejandro Cornejo-Rodríguez, "New technique of segments alignment in a large dimensions mirror," Proc. SPIE 10747, Optical System Alignment, Tolerancing, and Verification XII, 1074705 (Presented at SPIE Optical Engineering + Applications: August 19, 2018; Published: 19 September 2018); https://doi.org/10.1117/12.2320802.