Multi-band spectrometer is an important ancillary equipment of Yunnan one meter Solar Telescope, capable of getting highly precise multi-band spectral imaging. The mechanical structure of focal plane platform (important part of the multi-band spectrometer) was designed in this paper. This paper describes the role and significance of the multi-band spectrometer focal plane system of the one-meter Solar Telescope in Yunnan Province. This study offers an introduction to, and analysis of, the functions and design requirements of various components of the focal plane system, and the design programs and the results are provided. The focal plane system’s components include the slit, field lens, plane mirror, grating and CCD. Therefore, the structure design of various clamping device and system platform are the focus of this study. Among them, the focus plane of the reflector tackling the structural design and optimization platform. The emphasis is on the clamping device design of plane mirror and structural optimization of the system platform. Semi-kinematic installation structure is employed in the installation of the plane mirror. The surface distortion of the plane mirror should be confined to be less than 1 / 10 wavelength, so the position of the gripping plane mirror is very essential. With the help of finite element method, the author calculated the Stress and the deformation of the flat mirror in the multiple clamping position, and accordingly selected the final clamping position. To ensure that, in the application and the debug of the system, the deformation does not affect the platform, the system platform itself should have sufficient rigidity. In this paper, COSMOSWorks is employed to optimize the structure function of the platform. The results show that, compared with the simple flat, the stiffness of the optimized one is significantly increased, and the weight is lighter as well. Focal plane processing system components have been completed, assembly debug is under examination.
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