Fig. 1. Light scattering from non-ideal smooth surfaces

Fig. 2. Physical image of matt pattern and schematic diagram of matt pattern suppressing stray light

Fig. 3. Lens after painting

Fig. 4. Two-dimensional structure diagram of optical system of space detection camera

Fig. 5. 3D model of SOLIDWORKS space detection camera and stray light model of TracePro space detection camera

Fig. 6. Schematic diagram of forward ray tracing

Fig. 7. Schematic diagram of reverse ray tracing

Fig. 8. Half-sectional drawing of optomechanical system of space detection camera

Fig. 9. Adding matt threads on spacers 4 and 5

Fig. 10. Key sampling settings

Fig. 11. Threshold value and total number of intersection settings

Fig. 12. Relation curves between PST and off-axis angle of stray light source

Fig. 13. Prototype of space detection camera

Fig. 14. Physical drawing of measurement experiment

Fig. 15. Experimental images of ghost image at different incident angles

Fig. 16. Left half side of masked target surface

Fig. 17. Test results of target surface occlusion

Fig. 18. Target surface reflection image simulated by Zemax

Fig. 19. Analysis diagram of ghost image on target surface