首页|Optical system for extremely large spectroscopic survey telescope
Optical system for extremely large spectroscopic survey telescope
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This article presents research work on a spectroscopic survey telescope.Our idea is as follows:for such a telescope,a pure reflecting optical system is designed,which should have an aperture and a field of view(FOV)both as large as possible and excellent image quality,and then a strip lensm(lens-prism)atmospheric dispersion corrector(S-ADC)is added,only for correcting the atmospheric dispersion.Given the fund limitation and the simplicity of scaling up,some 12-m telescopes are designed as examples.Su,Korsch,and Meinel put forward the four-mirror Nasmyth systems Ⅰand Ⅱ which are used in this paper.FOVs of 1.5°,2°,and 2.5° are selected.For all systems,the image qualities are excellent.Because the S-ADC relaxes the optical glass size restriction,this 12-m telescope with a FOV of 2.5° can be magnified in proportion to a 16-m telescope.Its etendue(from French étendue)and focal surface will now be the largest in the world.In such a telescope,a pure reflecting optical system can also be obtained.A subsequent coudé system is designed with excellent image quality.
telescopesspectroscopicsurvey
Ding-qiang Su、Hua Bai、Xiangyan Yuan、Xiangqun Cui
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Key Laboratory of the Ministry of Education,School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China
Nanjing Institute of Astronomical Optics and Technology(NIAOT),Chinese Academy of Sciences,Nanjing 210042,China
University of Chinese Academy of Sciences,Nanjing 211135,China
School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China
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