OAJ 2.6m survey telescope: optical alignment and on-sky evaluation of IQ performances
OAJ 2.6m survey telescope: optical alignment and on-sky evaluation of IQ performances
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OAJ 2.6m 巡天望远镜：光学对准和 IQ 性能的空中评估
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Cenarro
中科院分区：
文献类型：
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作者：
G. Lousberg;C. Bastin;V. Moreau;O. Pirnay;C. Flebus;S. Chueca;C. Íñiguez;A. Ederoclite;H. V. Ramió;A. Cenarro
AMOS最近完成了为Javalambre天文观测台（OAJ）安装2.6米望远镜的校准工作。在CEFCA （Centro de Estudios de Física del Cosmos de Aragón）团队的积极支持下，AMOS开发了一种创新的宽视场望远镜对准技术，已成功应用于OAJ 2.6m望远镜。校准依赖于两种基本技术：(1)波前曲率传感（WCS），用于评估焦平面任意位置的望远镜像差；(2)自由点法，用于调整副镜（M2）和焦平面（FP）的位置。校准工作分为三个步骤：(a)分析WCS测量的可重复性，(b)评估望远镜波前误差对M2和FP位置调整的敏感性，以及(c)望远镜的光学校准。在活动结束时，在整个焦平面上展示了有限视觉性能。在CEFCA团队的帮助下，采用幸运成像法对望远镜的成像质量进行了研究。获得的图像尺寸小于0.3弧秒的FWHM，并且在整个焦平面上观察到这种优异的图像质量。
AMOS has recently completed the alignment campaign of the 2.6m telescope for the Observatorio Astrofisico de Javalambre (OAJ). AMOS developed an innovative alignment technique for wide field-of-view telescopes that has been successfully implemented on the OAJ 2.6m telescope with the active support of the team of CEFCA (Centro de Estudios de Física del Cosmos de Aragón). The alignment relies on two fundamental techniques: (1) the wavefront-curvature sensing (WCS) for the evaluation of the telescope aberrations at arbitrary locations in the focal plane, and (2) the comafree point method for the adjustment of the position of the secondary mirror (M2) and of the focal plane (FP). The alignment campaign unfolds in three steps: (a) analysis of the repeatability of the WCS measurements, (b) assessment of the sensitivity of telescope wavefront error to M2 and FP position adjustments, and (c) optical alignment of the telescope. At the end of the campaign, seeing-limited performances are demonstrated in the complete focal plane. With the help of CEFCA team, the image quality of the telescope are investigated with a lucky-imaging method. Image sizes of less than 0.3 arcsec FWHM are obtained, and this excellent image quality is observed over the complete focal plane.