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18 December 2019 Optical system design and manufacture for a 1U CubeSat
Zhihai Pang, Zongxi Song, Zhonghan Sun, Pengfei Cheng, Lijun Dan, Wei Li, Xuewu Fan
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Proceedings Volume 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation; 113410N (2019) https://doi.org/10.1117/12.2542219
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China
Abstract
Optical design of a small reflecting telescope for use in a 1U CubeSat mission is reported in this study. A Ritchey-Chretien with field correction lens type telescope for earth observation techniques is adopted in this design. The primary mirror and secondary mirror are circular apertures with 70-mm and 21-mm in diameter. The effective focal length is 390-mm operated at 600-km altitude. A commercial 2560 × 2160 CCD image sensor CIS2521 with a pixel size of 6.5 μm is applied, which capture a 25km swath area. The ground resolution is better than 10m for CubeSat application. The MTF is expected to be about 0.3 at Nyquist frequency at 77lp/mm. The tolerance analysis is performed for further understanding on fabrication and assembly errors. In order to reduce the telescope size, the optical system uses a reflective optical system, and the circuit board is arranged behind the system and above. The telescope envelope size(all contained) is less than 96mm × 90mm × 90mm and the weight is approximately 600g. At present, the aspherical primary mirror has completed the processing and assembly.
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Zhihai Pang, Zongxi Song, Zhonghan Sun, Pengfei Cheng, Lijun Dan, Wei Li, and Xuewu Fan "Optical system design and manufacture for a 1U CubeSat", Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 113410N (18 December 2019); https://doi.org/10.1117/12.2542219
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KEYWORDS
Mirrors
Optical design
Tolerancing
Telescopes
Reflector telescopes
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