论文标题
光栅轮组件传感器的机上性能和校准（NIRSPEC/JWST）
In-flight performance and calibration of the Grating Wheel Assembly sensors (NIRSpec/JWST)
论文作者
论文摘要
詹姆斯·韦伯（James Webb）太空望远镜上的近红外光谱仪（NIRSPEC）将是空间中的第一个多对象光谱仪，可提供约250,000个可配置的微型射击器，除了配备了整体场单元和固定缝隙。 NIRSPEC旋转轮组件的核心是配备六个色散光栅，棱镜和镜子的低温机构。车轮的有限角定位可重复性导致光束在焦平面上的较小但可测量的位移，从而排除了预测光线路径的静态解决方案。为了解决这个问题，每次旋转车轮时，都会使用两个磁性耐极的位置传感器来测量所选GWA元件的尖端和倾斜位移。这些传感器的校准是用于NIRSPEC的基于模型的方法的关键组成部分，用于校准，光谱提取和微型轴承中的目标位置。在本文中，我们介绍了GWA传感器性能和从地面到太空环境的校准演变的结果。
The Near-Infrared Spectrograph (NIRSpec) on board of the James Webb Space Telescope will be the first multi-object spectrograph in space offering ~250,000 configurable micro-shutters, apart from being equipped with an integral field unit and fixed slits. At its heart, the NIRSpec grating wheel assembly is a cryogenic mechanism equipped with six dispersion gratings, a prism, and a mirror. The finite angular positioning repeatability of the wheel causes small but measurable displacements of the light beam on the focal plane, precluding a static solution to predict the light-path. To address that, two magneto-resistive position sensors are used to measure the tip and tilt displacement of the selected GWA element each time the wheel is rotated. The calibration of these sensors is a crucial component of the model-based approach used for NIRSpec for calibration, spectral extraction, and target placement in the micro-shutters. In this paper, we present the results of the evolution of the GWA sensors performance and calibration from ground to space environments.
