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arXiv 2011.10526astro-ph.IM
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基于现成组件的小型主动控制高分辨率摄谱仪

A small actively-controlled high-resolution spectrograph based on off-the-shelf components

H. R. A. Jones, W. E. Martin, G. Anglada-Escudé, R. Errmann, D. A. Campbell, C. Baker, C. Boonsri, P. Choochalerm

摘要:

我们提出了一个原型的设计和测试的基础上,主动控制的光纤馈电双程设计的面内阶梯光栅光谱仪。该系统的目标是小而高效,具有最少数量的光学表面-目前是准直器/相机透镜,交叉色散棱镜,光栅和反射器,以将光发送到检测器。它由目录光学元件制成,尺寸约为20 x30 cm。它在光学范围内工作,分辨率> 70,000。摄谱仪由分叉光纤馈电,其中一根光纤连接到望远镜,另一根光纤用于同时提供钍氩光照明以进行波长校准。对探测器上的弧线位置进行实时处理,利用商业自动导航软件将弧线位置作为导航星。引导软件将任何所需的调整发送到机械压电致动器,该致动器移动反射镜,将光发送到相机,以消除弧线位置的任何漂移。使用sCMOS探测器的当前配置在标准实验室环境中提供相当于4 m/s的3.5毫像素的精度。

英文摘要:

We present the design and testing of a prototype in-plane echelle spectrograph based on an actively controlled fibre-fed double-pass design. This system aims to be small and efficient with the minimum number of optical surfaces - currently a collimator/camera lens, cross-dispersing prism, grating and a reflector to send light to the detector. It is built from catalogue optical components and has dimensions of approximately 20x30 cm. It works in the optical regime with a resolution of >70,000. The spectrograph is fed by a bifurcated fibre with one fibre to a telescope and the other used to provide simultaneous Thorium Argon light illumination for wavelength calibration. The positions of the arc lines on the detector are processed in real time and commercial auto-guiding software is used to treat the positions of the arc lines as guide stars. The guiding software sends any required adjustments to mechanical piezo-electric actuators which move the mirror sending light to the camera removing any drift in the position of the arc lines. The current configuration using an sCMOS detector provides a precision of 3.5 milli-pixels equivalent to 4 m/s in a standard laboratory environment.

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