O.A. Ivlev1, A.D. Sergeeva2, V.V. Polunadezhdin3, M.I. Yampolskiy4, N.G. Iroshnikov5, A.V. Larichev6, A.V. Yusov7, S.A. Kozlov8

1-4 JSC "Precision Systems and Instruments" (Moscow, Russia)

5,6 Lomonosov Moscow State University (Moscow, Russia)

7,8 LLC «Applied Mechanics» (Moscow, Russia)

When designing two mirror telescopes with a main mirror diameter of 1000 mm, requirements were made to keep the diffraction image quality during the observation session, which, with weight and size restrictions (distance between mirrors 1200 mm) led to tighter tolerances for the mutual position of the secondary and primary mirrors and required the search for technical solutions to create a system for built-in automatic control of telescope alignment. The purpose – to keep the stability of the alignment of large-sized astronomical telescopes during the observation session. The system for automatic alignment of the two mirror telescopes (SAA) makes it possible to ensure the stability of the image quality of the telescope during an observation session by controlling the relative position of the secondary mirror relative to the primary mirror of the telescope with tolerances along the optical axis (defocusing) no greater than 2 μm, in the transverse plane (linear transverse displacements) no greater than 4 microns, on slopes no greater than 2 arc. sec. (the center of the coordinate system is located at the top of the secondary mirror of the telescope). The results obtained can be used in the design of built-in systems for controlling the alignment of space- and ground-based mirror axial telescopes.

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