Based on the working principle of the Digital Micromirror Device(DMD),a star simulator optical system operat-ing in the 0.4～0.7 μm band has been designed to meet the performance testing and evaluation requirements of star sensors. The optical system consists of an illumination system,a prism,a DMD and a projection lens. The illumination system has a two-piece structure to ensure uniform illumination with 89％ uniformity. The projection system has a focal length of 87 mm,a half field angle of 5.75°,an exit pupil diameter of 31 mm and an exit pupil distance of 33 mm. After optimisation,the MTF of the system at a spatial frequency of 37 lp/mm is greater than 0.7,which is close to the diffraction limit,and the system distortion is less than 1％,which is good image quality. Meanwhile,under the relatively loose tolerance param-eters of the projection optical system,such as eccentricity,tilt and thickness,the yield is high. In conclusion,the system is compact and has excellent performance,bringing an important technological advance to the field of star simulation and inspection.
star simulatorstar sensorlighting systemprojection systemimage quality analysis
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