A large-aperture spherical primary mirror
A large-diameter, inner-diameter technology, applied in the field of large-diameter primary mirror structures, can solve the problems of increased manufacturing and launch costs, increased caliber, and insufficient processing and assembly accuracy, and achieves the effect of reduced weight and easy assembly.
Inactive Publication Date: 2011-12-14
SUZHOU UNIV
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Problems solved by technology
Traditional optical systems all use a single large-aperture optical system, such as the Hubble Telescope, with a primary mirror diameter of 2.4 meters and an angular resolution of 0.007″. However, the total weight has reached 11.25 tons, which is close to the current US space launch Capability limit
At the same time, the caliber increases, and the manufacturing and launch costs also increase. The Hubble Telescope took 12 years from the beginning to the launch, costing 1.5 billion US dollars
Therefore, the traditional optical system is becoming more and more difficult to adapt to the requirements of modern high-resolution aerospace optical remote sensing, and it is imminent to seek new principles and methods suitable for the development of large-aperture telescopes
[0004] At present, there are many methods of sparse aperture such as torus, ring, Golay and three-arm structure at home and abroad. However, there are still shortcomings in how to solve the accuracy of processing and assembly while reducing weight.
Method used
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Embodiment 1
[0022] See attached figure 1 , which is a schematic diagram of the structure of this embodiment. In this embodiment, the circular fan-shaped sub-aperture coding structure is based on a circular structure, and a central angle of a certain angle (α) is taken relative to the center of the circle to form a circular fan-shaped structure.
[0023] exist figure 1 In the shown rectangular coordinate relationship, D is the annular outer diameter of this ring fan-shaped sub-aperture, and d is the inner diameter of the ring, r=(D-d) / 2; α is the sub-aperture angle (radian), and the relationship between angle α and β is: α+2β=π / 2, the number of sub-apertures N=4.
[0024] In order to further determine the optical transfer function characteristics of the ring sector aperture coding structure provided in this embodiment, the mathematical model expression of its pupil function is as follows:
[0025] P ( r , θ ...
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The invention relates to a large-diameter primary mirror structure, in particular to an optical system with a concentric and sparse pupil coding structure of the large-diameter primary mirror. It consists of 3 to 6 identical sub-apertures, each sub-aperture is evenly distributed on the same circle, and the shape of the sub-aperture is a circular sector concentric with the primary mirror; its filling factor F satisfies: F>0.25; the primary mirror The optical transfer function of satisfies that all light information is contained within the maximum cut-off frequency. The primary mirror provided by the present invention is a concentric sparse aperture, so it is easier to assemble and is suitable for any optical system with a primary mirror. Military and civilian fields such as high-resolution, lightweight space remote sensors for earth observation, environmental natural disaster monitoring, etc.
Description
technical field [0001] The present invention relates to a large-diameter primary mirror structure, in particular to an optical system with a concentric and sparse pupil coding structure for the large-diameter primary mirror, which is suitable for high-resolution, light-weight space remote sensors for earth observation and environmental natural disasters Monitoring and other military and civilian fields. Background technique [0002] With the continuous development of space exploration, astronomical research and earth observation, people have higher and higher requirements for observation accuracy, and improving the spatial resolution of telescopes has become an urgent need. Resolution is an important performance index of space remote sensing optical system, which marks the development level of a country's space technology. At present, countries around the world are scrambling to develop high-resolution space optical remote sensors to meet the needs of military and civilian ...
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IPC IPC(8): G02B13/00
Inventor 韦晓孝余建军沈为民
Owner SUZHOU UNIV