ASTROSAT上的紫外成像望远镜（UVIT）
Ultra Violet Imaging Telescope (UVIT) on ASTROSAT
摘要：
ASTROSAT卫星任务上的紫外成像望远镜是一套远紫外（FUV 130至180 nm），近紫外（NUV 200至300 nm）和可见光波段（VIS 320至550 nm）成像仪。ASTROSAT是印度的第一个多波长飞行任务。UVIT将在三个通道中同时对天空中选定的区域进行成像，并观察年轻的恒星，星系，明亮的紫外线源。3个通道中的每一个中的FOV约为28弧分。所得UV图像中的目标角分辨率优于1.8弧秒（对于可见光通道优于2.0弧秒）。两个相同的里奇-克雷蒂安配置的共同对准望远镜（T1，T2）（主镜直径为375 mm）收集天体辐射，并通过滤光轮机构上的可选滤光片馈送到探测器系统;光栅可用于FUV和NUV通道的滤光轮，用于无狭缝低分辨率光谱学。3个通道中每个通道的检测器系统基本相同。其中一个望远镜在FUV通道成像，而其他望远镜在NUV和VIS通道成像。利用VIS通道图像进行漂移测量，通过平移相加算法重建地面图像，并重建图像的绝对方位角。提供了足够的挡板，以减少来自太阳、地球赤道和其他明亮物体的散射背景。每台望远镜上的一次性可打开机械盖在部署后也可用作遮阳板。我们在此介绍有效载荷的总体（机械、光学和电气）设计。
英文摘要：
Ultra Violet Imaging Telescope on ASTROSAT Satellite mission is a suite of Far Ultra Violet (FUV 130 to 180 nm), Near Ultra Violet (NUV 200 to 300 nm) and Visible band (VIS 320 to 550nm) imagers. ASTROSAT is the first multi wavelength mission of INDIA. UVIT will image the selected regions of the sky simultaneously in three channels and observe young stars, galaxies, bright UV Sources. FOV in each of the 3 channels is about 28 arc-minute. Targeted angular resolution in the resulting UV images is better than 1.8 arc-second (better than 2.0 arc-second for the visible channel). Two identical co-aligned telescopes (T1, T2) of Ritchey-Chretien configuration (Primary mirror of 375 mm diameter) collect celestial radiation and feed to the detector system via a selectable filter on a filter wheel mechanism; gratings are available in filter wheels of FUV and NUV channels for slit-less low resolution spectroscopy. The detector system for each of the 3 channels is generically identical. One of the telescopes images in the FUV channel, while the other images in NUV and VIS channels. Images from VIS channel are also used for measuring drift for reconstruction of images on ground through shift and add algorithm, and to reconstruct absolute aspect of the images. Adequate baffling has been provided for reducing scattered background from the Sun, earth albedo and other bright objects. One time open-able mechanical cover on each telescope also works as a Sun-shield after deployment. We are presenting here the overall (mechanical, optical and electrical) design of the payload.
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