Structural design and analysis of spliced mirror base

SUN Nan-nan, YUAN Zi-yang
(School of Instrument Science and Optoelectronic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract: Aiming at the problems of low adjustment accuracy, poor stability and inaccurate positioning of the lens posture of some active optical splice lens support structures, a design method of splice lens support mechanism based on the three-point support model was proposed. A three-point multi-degree-of-freedom motion coupling method was used to design a support structure for fine-tuning the spatial and posture of the splicing lens of the telescope, and the finite element software was used for simulation experiment analysis. The boundary conditions were set with continuously changed environment temperature. From the perspective of thermal stability, thermal expansion, displacement change, and self-centering of the mechanism, the structure was simulated. The results indicate that the design mechanism is reasonable. It has good stability and can achieve nano-scale micro-displacement adjustment of the lens posture. The adjustment accuracy is high, which can lay a certain foundation for the confocal and co-phase experiments of the spliced lens in the future.
Key words: active optics; stitching mirror; motion of coupling; motion freedom