Fig. 1. Lens composition of spectrometer

Fig. 2. Preliminary design scheme of spectrometer structure

Fig. 3. Installation and fixation of reflector

Fig. 4. Topology optimization results of main module and collimating mirror module

Fig. 5. Topology optimization results of imaging objective lens frame

Fig. 6. Iterative convergence curve of topology optimization

Fig. 7. Geometric parameters of main module and collimating mirror module

Fig. 8. Geometric parameters of imaging objective lens frame

Fig. 9. Contribution of parameters to each response function

Fig. 10. Iterative curve of design variables

Fig. 11. Optimized main structure of the spectrometer

Fig. 12. Structure of ultraviolet imaging spectrometer

Fig. 13. Deformation of collimating mirror affected by gravity

Fig. 14. Spot diagram of optical system subjected to gravity

Fig. 15. Change of the surface type of collimating mirror

Fig. 16. Change of the surface type of grating surface type

Fig. 17. Spot diagram of optical system at 10 ℃

Fig. 18. Spot diagram of optical system at 30 ℃

Fig. 19. Impurity elimination diaphragm in imaging objective lens

Fig. 20. Stray light ray diagram

Fig. 21. Measuring point curve of random vibration test

Fig. 22. Flow chart of spectrometer setup