Fig. 1. Experimental principle of coronagraph imaging detection

Fig. 2. Working principle of inner-occulted coronagraph（the green part shows the sun's corona light path）

Fig. 3. Simulation architecture of coronagraph system（non-equal ratio scale）

Fig. 4. Suppression principle of the diffraction from the objective and the secondary reflection ghost point

Fig. 5. The position of the point source for simulating the aperture diffraction

Fig. 6. The propagation path of the simulated diffracted light in the optical system

Fig. 7. Diagram of multiple reflection of sunlight in objective O₁

Fig. 8. The first image plane and ghost point of the second reflection on the inner surface of the objective

Fig. 9. Diagram of ghost location and its effect on the image plane

Fig. 10. Scattering point simulation diagram of coronagraph objective

Fig. 11. Diagram of imaging position of scattering points in coronagraph objective and its effect on image plane

Fig. 12. Experimental apparatus for coronagraph detection

Fig. 13. Picture of a ghost image plane

Fig. 14. Comparison of stray light before and after blocking the ghost image

Fig. 15. Scattering point imaging with the coronagraph objective

Fig. 16. Schematic diagram for the equivalent system position relationship for the three stray light types of the coronagraph