Non-contact profilometry of E-ELT segments at OpTIC Glyndwr
Non-contact profilometry of E-ELT segments at OpTIC Glyndwr
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OpTIC Glyndwr 的 E-ELT 节段非接触式轮廓测量
DOI：
10.1117/12.893690
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Atkins C
中科院分区：
文献类型：
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作者：
Atkins C
在欧洲南方天文台 (ESO) 进行“招标”后，由 OpTIC Glyndwr Ltd 领导的合作伙伴正在为欧洲极大望远镜 (E-ELT) 生产七个原型部分。每个六边形段的角对角长为 1.4 m，基本曲率半径 (ROC) 为 84 m，984 个段的组合将形成直径为 42 m 的主镜。原型段的抛光在 OpTIC Glyndwr 内部使用 Zeeko 抛光机进行，而现场干涉测量则使用建在抛光机上方专门设计的光学测试塔进行。为了确认原型段的基本曲率半径，使用了机上非接触式轮廓仪。轮廓仪安装在抛光机的桥上，并在抛光过程中被移除。轮廓仪的设计基于源自同步加速器光学界的纳米光学元件测量机 (NOM) 系统。该仪器通过整合测量的坡度数据来确定表面上一系列点的高度。本文介绍了 OpTIC-NOM 作为机内和机外分析仪的操作。通过参与循环研究，将分析仪的机内和机外精度及其精度与类似的分析仪进行比较。给出了主球面段 (MSS) 的曲率半径结果，该主球面段是 E-ELT 段的参考光学器件，并突出显示平均曲率半径的标准偏差为 2.5 毫米。最后，总结了关于原型段的抛光和缝合算法的开发以从轮廓测量数据生成 3D 表面图的未来工作。
Following a 'Call for Tenders' by the European Southern Observatory (ESO) a collaboration headed by OpTIC Glyndwr Ltd is producing seven prototype segments for the European Extremely Large Telescope (E-ELT). Each hexagonal segment is 1.4 m corner-to-corner with a base radius of curvature (ROC) of 84 m and the combination of 984 segments will lead to a primary mirror with a diameter of 42 m. The polishing of the prototype segments occurs in-house at OpTIC Glyndwr using a Zeeko polishing machine, while in situ interferometry is undertaken using a specifically designed optical test tower built above the polishing machine. To confirm the base radius of curvature of the prototype segments an on-machine non-contact profiler is used. The profiler attaches to the bridge of the polishing machine and is removed during polishing. The design of the profiler is based upon a nanometre optical component measuring machine (NOM) system, originating from the sychrotron optics community. This instrument determines the height at a series of points across the surface through the integration of measured slope data. This paper presents the operation of the OpTIC-NOM as both an on-machine and off-machine profiler. The accuracy of the profiler both on- and off-machine and its accuracy is compared against similar profilers through its participation in a round robin study. Radius of curvature results are presented for the master spherical segment (MSS), which is a reference optic for the E-ELT segments and highlights a standard deviation on the mean radius of curvature of 2.5 mm. Finally, a summary of future work is presented regarding the polishing of the prototype segments and the development of a stitching algorithm to produce 3D surface maps from profilometry data.
关于坡度测量剖面仪欧洲循环赛的第一份报告
DOI：
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发表时间：
2005
期刊：
SPIE Optics + Photonics
影响因子：
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作者：
A. Rommeveaux;M. Thomasset;D. Cocco;F. Siewert
通讯作者：
F. Siewert
用于坡度测量剖面仪的 COST P7 Round Robin
DOI：
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发表时间：
2008
期刊：
影响因子：
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作者：
A. Rommeveaux;M. Thomasset;D. Cocco;F. Siewert
通讯作者：
F. Siewert
DOI：
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发表时间：
2008
期刊：
影响因子：
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作者：
F. Siewert;H. Lammert;T. Zeschke
通讯作者：
T. Zeschke