Design and verification of bidirectional flexible support for off-axis reflectors in large-aperture telescope systems

Abstract

In response to the requirements of high surface quality and high stability support for reflector components in the transportation of ground telescope systems and the use of two-dimensional swing scanning, this paper designs a composite support scheme for the side and bottom of large-diameter off-axis reflectors with bidirectional flexible support. Multiple sets of flexible hinges are set up to release excess degrees of freedom, achieving kinematic decoupling of the support system, while ensuring surface quality, Effectively improved the mechanical reliability and temperature adaptability of the reflector components, and applied them in a certain telescopic optical system Ф Verification was conducted during the development of an 800mm caliber off axis mirror assembly, and the results showed that the mirror assembly using this bidirectional flexible support had excellent performance in the range of 0 ° to 30 ° pitch sweep and a temperature rise of 30 ℃. It met the requirements of the first mode ≥ 50Hz of the main mirror assembly, and the surface shapes of different sweep angles met RMS better than others λ/ The requirement of 30 has verified the effectiveness of the design.