蜻蜓型谱线测绘仪的设计与首次使用
The Dragonfly Spectral Line Mapper: Design and First Light
摘要：
Dragonfly谱线成像仪（DSLM）是Dragonfly远摄阵列的最新发展，使其成为世界上最强大的宽视场谱线成像仪。DSLM相当于一个1.6米口径的$f$ /0.26折射望远镜，内置积分场光谱仪，覆盖5平方度的视场。新望远镜的设计目的是对低表面亮度宇宙进行超窄带通成像，对系统误差进行精确控制，包括对气辉中的大气变化进行实时校准。Dragonfly转型的关键是“滤波器倾斜器”，这是一种机械组件，它将超窄带通干涉滤波器固定在阵列中的每个透镜前面，并倾斜它们以平滑地移动其中心波长。在这里，我们描述了我们的开发过程的基础上，快速原型，迭代设计和大规模生产。这一过程导致了对最初的探路者仪器的DSLM设计的许多改进，包括改变为更窄的带通滤波器和增加一套用于连续光减法和天空线监测的校准滤波器。对阵列的电子和硬件也进行了改进，提高了倾斜精度、刚度和遮光性。在此，我们介绍了2022年5月部署第一组镜头的实验室和天空测量结果，以及2023年初完成完整阵列的进度报告。
英文摘要：
The Dragonfly Spectral Line Mapper (DSLM) is the latest evolution of the Dragonfly Telephoto Array, which turns it into the world's most powerful wide-field spectral line imager. The DSLM will be the equivalent of a 1.6m aperture $f$/0.26 refractor with a built-in Integral Field Spectrometer, covering a five square degree field of view. The new telescope is designed to carry out ultra-narrow bandpass imaging of the low surface brightness universe with exquisite control over systematic errors, including real-time calibration of atmospheric variations in airglow. The key to Dragonfly's transformation is the "Filter-Tilter", a mechanical assembly which holds ultra-narrow bandpass interference filters in front of each lens in the array and tilts them to smoothly shift their central wavelength. Here we describe our development process based on rapid prototyping, iterative design, and mass production. This process has resulted in numerous improvements to the design of the DSLM from the initial pathfinder instrument, including changes to narrower bandpass filters and the addition of a suite of calibration filters for continuum light subtraction and sky line monitoring. Improvements have also been made to the electronics and hardware of the array, which improve tilting accuracy, rigidity and light baffling. Here we present laboratory and on-sky measurements from the deployment of the first bank of lenses in May 2022, and a progress report on the completion of the full array in early 2023.
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