用于DUNE任务的焦平面仪器
The focal plane instrumentation for the DUNE mission
摘要：
DUNE（Dark Universe Explorer）是一个利用弱引力透镜测量暗能量参数的任务。本文讨论了光学和红外焦平面以及DUNE基线解决方案的特殊挑战。DUNE可见光焦平面阵列（VFP）由36个大幅面红敏CCD组成，以9 x4阵列排列，以及相关的机械支撑结构和电子处理链。四个额外的CCD专用于姿态控制测量位于阵列的边缘。所有CCD均为4096像素红色增强e2 v CCD 203 -82器件，具有方形12 $μ$ m像素，工作波长为550- 920 nm。组合四行CCD提供1500 s的总曝光时间。VFP将用于航天器的闭环系统，该系统以漂移扫描模式运行，以同步扫描和读出速率。近红外（NIR）FPA由Teledyne的60个Hawaii 2 RG探测器阵列的5 x 12拼接、用于波长带Y、J和H的NIR带通滤波器、机械支撑结构以及探测器读出和信号处理电子器件组成。焦平面阵列的最高工作温度为140 K，暗电流为0.02 e $-$ /s。每个传感器芯片组件具有18 $μ$ m大小（0.15弧秒）的2048 x 2048平方像素，在0.8至1.7 $μ$ m波长范围内敏感。当航天器扫描天空时，在每个探测器300 s的积分时间内，近红外焦平面上的图像运动由去扫描镜稳定。1500秒的总积分时间在三个NIR波长带之间分配。DUNE已被提交给欧空局的宇宙视野计划，并已与空间联合选择欧空局评估阶段，导致了联合欧几里得任务概念。
英文摘要：
DUNE (Dark Universe Explorer) is a proposed mission to measure parameters of dark energy using weak gravitational lensing The particular challenges of both optical and infrared focal planes and the DUNE baseline solution is discussed. The DUNE visible Focal Plane Array (VFP) consists of 36 large format red-sensitive CCDs, arranged in a 9x4 array together with the associated mechanical support structure and electronics processing chains. Four additional CCDs dedicated to attitude control measurements are located at the edge of the array. All CCDs are 4096 pixel red-enhanced e2v CCD203-82 devices with square 12 $μ$m pixels, operating from 550-920nm. Combining four rows of CCDs provides a total exposure time of 1500s. The VFP will be used in a closed-loop system by the spacecraft, which operates in a drift scan mode, in order to synchronize the scan and readout rates. The Near Infrared (NIR) FPA consists of a 5 x 12 mosaic of 60 Hawaii 2RG detector arrays from Teledyne, NIR bandpass filters for the wavelength bands Y, J, and H, the mechanical support structure, and the detector readout and signal processing electronics. The FPA is operated at a maximum temperature of 140 K for low dark current of 0.02e$-$/s. Each sensor chip assembly has 2048 x 2048 square pixels of 18 $μ$m size (0.15 arcsec), sensitive in the 0.8 to 1.7 $μ$m wavelength range. As the spacecraft is scanning the sky, the image motion on the NIR FPA is stabilized by a de-scanning mirror during the integration time of 300 s per detector. The total integration time of 1500 seconds is split among the three NIR wavelengths bands. DUNE has been proposed to ESA's Cosmic Vision program and has been jointly selected with SPACE for an ESA Assessment Phase which has led to the joint Euclid mission concept.
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