Title :
Design and simulation of CMOS star sensor lens with large relative aperture and wide field
Author :
Xing Zhong ; Guang Jin
Author_Institution :
Changchun Inst. of Opt., Chinese Acad. of Sci., Jilin, China
Abstract :
A 50mm focal length, F/1.25, Gaussian type optical system is designed in this paper, which has 20°field of view. Actual star image adding optical cross-talk effect of CMOS(Complementary Metal Oxide Semiconductor), detector is simulated by non-sequential ray tracing in ZEMAX® optical design and analysis software to evaluate its performance. The distortion relative to image spot centriod is introduced and calculated by simulated star images, which is less than 0.03% of lens in this paper. Thermal adaptability is discussed by opt-mechanic thermal analysis, which shows the RMS spot radius of marginal filed changes less than 0.7μm under 10°C temperature gradient, and changes less than 1μm during homogeneous temperature changing from -40°C to +40°C. The results of analyses and simulations show the design of this lens can achieve the requirement of high precision CMOS star sensor well.
Keywords :
CMOS image sensors; astronomical instruments; astronomical techniques; optical sensors; ray tracing; star trackers; thermal analysis; CMOS star sensor lens; RMS spot radius; ZEMAX optical design; analysis software; complementary metal oxide semiconductor; image spot centriod; nonsequential ray tracing; optical cross-talk effect; optmechanic thermal analysis; relative aperture; size 50 mm; thermal adaptability; wide field; CMOS integrated circuits; Lenses; Optical design; Optical distortion; Optical imaging; Optical sensors; Temperature sensors; energy centroid; optical system; star sensor lens; thermal analysis;
Conference_Titel :
Electronic and Mechanical Engineering and Information Technology (EMEIT), 2011 International Conference on
Conference_Location :
Harbin, Heilongjiang, China
Print_ISBN :
978-1-61284-087-1
DOI :
10.1109/EMEIT.2011.6023764
