The optical window of space optical system is important for optical observation. It been used to isolate the extreme space environment and protect precision optical elements. There is no thermal design for optical windows on traditional space systems. However, under the space thermal alternation application environments, the temperature change can lead to deformation of optical elements which will cause image distortion. Especially for the large-aperture optical system. The study on thermal design for space optical window becomes very meaningful. In this paper, by the way of heat conduction and radiation, two available heating region (the window frame and the light baffle inner surface) are utilized to indirectly affect the temperature of space optical window. Three thermal design methods are presented, and the effects of different methods have been evaluated by the simulation study on a fictional LEO earth camera’s optical window. The results show that the thermal design of heating two available region can both reduce the window’s temperature difference and improve its optical performance. Especially, the effect of heating frame is more significant. This study can be used as a reference for the thermal design and thermal control strategy of large aperture space optical window in the future.
Using lightweight, replicated diffractive optics, we can construct extremely large aperture telescopes in space.The transmissive primary significantly reduces the sensitivities to out of plane motion as compared to reflective systems while reducing the manufacturing time and costs. This paper focuses on the design, fabrication and ground demonstration of a 460mm diffractive transmissive telescope,the primary F/# is 6, optical field of view is 0.2° imagine bandwidth is 486nm~656nm.The design method of diffractive optical system was verified, the ability to capture a high-quality image using diffractive telescope collection optics was tested.The results show that the limit resolution is 94lp/mm, the diffractive system has a good imagine performance with broad bandwidths. This technology is particularly promising as a means to achieve extremely large optical primaries from compact, lightweight packages.
Large mirror's support position plays a very important role in optical system's wave-front error. This paper took a Φ1.2m diameter primary mirror as an example and introduced the method of integrated opto-mechanical optimization analysis, then structure's parametric model in Proe, finite element's parametric model in Patran, structure analysis in Nastran and opto-mechanical coupling analysis in Sigfit were integrated as a fully automatic process in Isight by use of command streams and result documents produced by these soft wares. After the process was established and verified, automatic gradient searches of primary mirror's optimal support position were conducted using optimizer embedded in Isight. The optimization objective is the minimum of surface error's RMS and the optimization variables are support positions. New searches can easily be conducted repeatedly after mirror's model is modified in the structure parameter document. Because of the search process is fully automatic, manpower and computing time are greatly saved. This example also provides a good reference for problems in opto-mechanical fields.
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