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首页> 外文会议>Conference on Cryogenic Optical Systems and Instruments X; Aug 6, 2003; San Diego, California, USA >Alignment of the grating wheel mechanism for a ground-based, cryogenic, near-infrared astronomy instrument
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Alignment of the grating wheel mechanism for a ground-based, cryogenic, near-infrared astronomy instrument

机译：地面，低温，近红外天文仪器的光栅轮机构对准

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摘要

We describe the population, optomechanical alignment, and alignment verification of near-infrared gratings on the grating wheel mechanism (GWM) for the Infrared Multi-Object Spectrometer (IRMOS). IRMOS is a cryogenic (80 K), principle investigator-class instrument for the 2.1 m and Mayall 3.8 m telescopes at Kitt Peak National Observatory, and a MEMS spectrometer concept demonstrator for the James Webb Space Telescope. The GWM consists of 13 planar diffraction gratings and one flat imaging mirror (58 x 57 mm), each mounted at a unique compound angle on a 32 cm diameter gear. The mechanism is predominantly made of Al 6061. The grating substrates are stress relieved for enhanced cryogenic performance. The optical surfaces are replicated from off-the-shelf masters. The imaging mirror is diamond turned. The GWM spans a projected diameter of ～48 cm when fully assembled, utilizes several flexure designs to accommodate potential thermal gradients, and is controlled using custom software with an off-the-shelf controller. Under ambient conditions, each grating is aligned in six degrees of freedom relative to a coordinate system that is referenced to an optical alignment cube mounted at the center of the gear. The local tip/tilt (R_x/R_y) orientation of a given grating is measured using the zero-order return from an autocollimating theodolite. The other degrees of freedom are measured using a two-axis cathetometer and rotary table. Each grating's mount includes a one-piece shim located between the optic and the gear. The shim is machined to fine align each grating. We verify ambient alignment by comparing grating diffractive properties to model predictions.
机译：我们在红外多目标光谱仪（IRMOS）的光栅轮机构（GWM）上描述了近红外光栅的数量，光机械对准和对准验证。 IRMOS是基特峰国家天文台的2.1 m和Mayall 3.8 m望远镜的低温（80 K）原理研究员级仪器，也是James Webb太空望远镜的MEMS光谱仪概念演示器。 GWM由13个平面衍射光栅和一个平面成像镜（58 x 57 mm）组成，每个均以独特的复合角安装在直径为32 cm的齿轮上。该机构主要由Al 6061制成。光栅基板经过应力消除，可增强低温性能。光学表面是从现成的原版复制的。成像镜是钻石车削的。完全组装后，GWM的预计直径为〜48 cm，利用多种挠性设计来适应潜在的温度梯度，并使用带有现成控制器的定制软件进行控制。在环境条件下，每个光栅相对于坐标系以六个自由度对齐，该坐标系参照安装在齿轮中心的光学对齐立方体。使用自准直经纬仪的零阶返回测量给定光栅的局部倾斜/倾斜（R_x / R_y）方向。其他自由度使用两轴导管仪和旋转台测量。每个光栅的安装座都包括一个单片垫片，该垫片位于光学元件和齿轮之间。对垫片进行机械加工以使每个光栅精确对准。我们通过比较光栅衍射特性与模型预测来验证环境对准。

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