Opto-mechanical design and development status of an all spherical five lenses focal reducer for the 2.3 m Thai National Telescope
Opto-mechanical design and development status of an all spherical five lenses focal reducer for the 2.3 m Thai National Telescope
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2.3 m泰国国家望远镜全球面五透镜减焦器光机设计与开发现状
DOI：
10.1117/12.2231168
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Alexis Deboos
中科院分区：
文献类型：
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作者：
C. Buisset;A. Prasit;T. Lépine;S. Poshyachinda;B. Soonthornthum;Alexis Deboos
目前，国立天文研究所正在开发一种全球面五镜头减焦器，用于在像素为0.42英寸/像素的4K相机上成像直径为Δθ = 14.6 '的FOV圆。在全可见光谱域[400 nm， 800 nm]的空间分辨率将优于1.2“。鬼影和科学图像之间的相对辐照度将低于10-4。最大畸变将低于1%，滤波器的最大入射角将等于8°。该减焦装置包括位于叉口的1个双透镜L1和位于相机前方的1个三透镜L2。双极L1将被安装在一个放置在机器人滑轨上的倾斜支架上。因此，在使用4K摄像机进行观测时，L1将被放置在光路中，而在使用其他仪器进行观测时，L1将被移除。三联L2将安装在配备滤光轮的相机前的仪器立方上。玻璃将在一家专业公司制造，机械部件将使用NARIT计算机数控机床制造，镜片将在NARIT集成。本文介绍了它的光学和机械设计，并给出了几何性能、传输预算和杂散光分析结果。
The National Astronomical Research Institute (NARIT) is currently developing an all spherical five lenses focal reducer to image a FOV circular of diameter Δθ = 14.6’ on the 4K camera with a pixel scale equal to 0.42’’/pixel. The spatial resolution will be better than 1.2’’ over the full visible spectral domain [400 nm, 800 nm]. The relative irradiance between the ghost and the science images will be lower than 10-4. The maximum distortion will be lower than 1% and the maximum angle of incidence on the filters will be equal to 8°. The focal reducer comprises 1 doublet L1 located at the fork entrance and 1 triplet L2 located in front of the camera. The doublet L1 will be mounted on a tip-tilt mount placed on a robotic sliding rail. L1 will thus be placed in the optical path during the observations with the 4K camera and will be removed during the observations with the other instruments. The triplet L2 will be installed on the instrument cube in front of the camera equipped with the filter wheel. The glass will be manufactured in a specialized company, the mechanical parts will be manufactured by using the NARIT Computer Numerical Control machine and the lenses will be integrated at NARIT. In this paper, we describe the optical and mechanical designs and we present the geometrical performance, the transmission budget and the results of the stray light analyses.