Fig. 1. Optical system structure of solar alignment system

Fig. 2. Mechanical structure of solar alignment system

Fig. 3. Solar alignment system

Fig. 4. Program interface of pointing accuracy during alignment

Fig. 5. Program interface of pointing accuracy not aligned

Fig. 6. Calculation diagram of angle deviation

Fig. 7. Optical system structure of coronagraph

Fig. 8. MTF curves of coronagraph

Fig. 9. Spot diagrams of coronagraph

Fig. 10. Mechanical structure of coronagraph

Fig. 11. Coronal brightness curve^［10-11］

Fig. 12. External occulter shape

Fig. 13. Field intensity at the entrance pupil by single-disk and three-disk occulters

Fig. 14. Laboratory ambient light brightening

Fig. 15. Schematic diagram of black hole

Fig. 16. Relation between reflectance of absorbent film and wavelength

Fig. 17. Schematic diagram of light paths detected in space

Fig. 18. Schematic diagram of light path detected in the laboratory

Fig. 19. Photos of experimental set-up

Fig. 20. Single-disk and three-disk diffraction experiment

Fig. 21. Total stray light detection experiment