Optical system research of multi-object fiber spectroscopic survey telescope

• 作者: Hua Bai Ding-Qiang Su Ming Liang Stephen A.Shectman Xiang-Yan Yuan Xiang-Qun Cui
• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: Research Papers
• 页码范围: 69-76
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/21/6/132

摘要

In the first part of this paper,four different Cassegrain optical systems with their correctors are designed and studied for multi-object fiber slit spectroscopic survey.The aperture in 6.5 m and field of view 3° are taken for these optical systems.Assuming observation wavelength range is 0.365-0.95 μm,the maximum zenith distance for observing is 60°,the maximum diameter of these lenses is 1.66 m,the altitude of the telescope site is 2500 m,two correctors are composed of 4-piece lenses and the other two are 5-piece lenses.The results obtained are:f-ratio about 3.7,the image quality for all four systems with EE80D≤0.60",the linear diameter of the focal surface is about 1.2 m and 11 000 fibers can be set on it.Considering the limit of size of fused silica and optical glass,the maximum diameter for lens is about 1.7 m.Such a 6.5 m telescope is about the largest one if using the above correctors.Considering the multi-object spectroscopic survey is greatly important,we also studied some telescope optical systems having their aperture near or larger than 10 m used for the multi-object fiber spectroscopic survey.Such ideas are introduced in the last section of this paper.