Structural Design and Optimization of SiC Mirror for the Ground-Based Telescope
In order to meet the needs of different task scenarios,ground-based telescopes are gradually developing towards vehicle mounted and other active station modes.The mirror is one of the important components of ground-based telescopes,and its performance directly affects the imaging quality and measurement accuracy of the telescope.In order to meet the needs of mobile measurement of ground-based telescopes,a lightweight design of a SiC mirror with an effective aperture of 650 mm was studied.Firstly,the material of the mirror was determined and supported using the classic traditional mode.Then,based on the supporting structure and material characteristics,a fan-shaped semi closed structure was determined for the back of the mirror through comprehensive comparison.By utilizing advanced SiC sintering technology to prepare anisotropic structures,combined with optimization design theory,the mirror was designed to be lightweight while meeting the accuracy of the main mirror surface.The optimized design weight of the mirror is only 28.25 kg,with a surface density of 82.6 kg/m2,which is 56.5%lighter than the microcrystalline mirror of the same size.Through simulation analysis of the mirror surface shape under different optical axis orientation states,the RMS value can reach λ/47.5 in the horizontal state and λ/100.6 in the zenith state.The mirror surface shape meets the optical design requirements,providing a theoretical basis and technical reserve for engineering design.
SiC mirrorlightweightfinite element analysisoptimized design
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