Prime Focus Spectrograph (PFS): the metrology camera system
Prime Focus Spectrograph (PFS): the metrology camera system
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主焦光谱仪 (PFS)：计量相机系统
DOI：
10.1117/12.2561191
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
N. Takato
中科院分区：
文献类型：
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作者：
Shiang‐Yu Wang;Chueh;Yin;Pin;J. Karr;Chi;J. Gunn;C. Loomis;R. Lupton;H. Siddiqui;Shu;Yen;D. Reiley;N. Tamura;Y. Moritani;N. Takato
主焦点摄谱仪（PFS）是一种新的光学/近红外多光纤摄谱仪，专为8.2米斯巴鲁望远镜的主焦点而设计。PFS将覆盖直径为1.3度的视野，有2394根光纤，以补充Hyper SuprimeCam的成像能力。为了保持高吞吐量，PFS的光纤和观察目标之间的最终定位精度要求小于10 µ m。计量相机系统（MCS）用作光纤定位器的光学编码器，用于配置光纤。MCS位于Subaru望远镜的卡塞格伦焦点上，用一个50 M像素的CMOS传感器覆盖整个焦平面。来自MCS的信息将被送入光纤定位器控制系统进行闭环控制。MCS于2018年4月交付给斯巴鲁天文台，并于2018年10月和2019年8月进行了两次工程运行。第一次工程运行得出结论，需要改进原始反射镜支架，以提供更好的图像质量。新设计的反射镜支架在第二次工程运行之前安装。第二次工程运行结果表明，MCS整体位置精度优于4μm，图像处理时间小于4秒。MCS已准备好与其他PFS组件进行系统集成。
The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph designed for the prime focus of the 8.2m Subaru telescope. PFS will cover a 1.3 degree diameter field with 2394 fibers to complement the imaging capabilities of Hyper SuprimeCam. To retain high throughput, the final positioning accuracy between the fibers and observing targets of PFS is required to be less than 10 µ m. The metrology camera system (MCS) serves as the optical encoder of the fiber positioners for configuring of fibers. The MCS locates at the Cassegrain focus of the Subaru telescope to cover the whole focal plane with one 50M pixel CMOS sensor. The information from MCS will be fed into the fiber positioner control system for closed loop control. The MCS was delivered to Subaru Observatory in Apr. 2018 and it had two engineering runs in Oct. 2018 and Aug. 2019. The 1st engineering run concluded that the original mirror supports need to be improved to provide better image quality. The newly designed mirror supports were installed before the 2nd engineering run. The 2nd engineering run result shows that the MCS overall position accuracy is better than 4μm and the image processing time is less than 4 seconds. The MCS is ready for the system integration with other PFS components.