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arXiv 1208.6301astro-ph.IM
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(Sn)DICE:为宽视场成像仪设计的校准系统

(Sn)DICE: A Calibration System Designed for Wide Field Imagers

N. Regnault, E. Barrelet, A. Guyonnet, C. Juramy, P. -F. Rocci, L. Le Guillou, K. Schahmanèche, F. Villa

摘要:

对Ia型超新星的暗能量研究对用于探测超新星和跟踪其通量变化的成像仪的光度校准设置了非常严格的限制。其中的关键挑战是测量的形状和归一化的仪器吞吐量。DICE系统是由超新星遗产调查(SNLS)的成员开发的,建立在MegaCam成像仪工作的经验教训之上。它包括一个非常稳定的光源,放置在望远镜外壳中,产生紧凑的锥形光束,产生成像器焦平面的几乎平坦的照明。校准光由窄光谱LED产生,选择窄光谱LED以覆盖成像器的整个波长范围。使用控制光电二极管进行实时监控。第一个DICE演示器SnDICE已经安装在CFHT。第二代仪器(SkyDICE)已安装在SkyMapper望远镜的外壳中。我们提出了该项目的主要目标。我们讨论的主要困难时,试图校准宽视场成像仪,如MegaCam(或SkyMapper)使用这样的校准光源。

英文摘要:

Dark Energy studies with type Ia supernovae set very tight constraints on the photometric calibration of the imagers used to detect the supernovae and follow up their flux variations. Among the key challenges is the measurement of the shape and normalization of the instrumental throughput. The DICE system was developed by members of the Supernova Legacy Survey (SNLS), building upon the lessons learnt working with the MegaCam imager. It consists in a very stable light source, placed in the telescope enclosure, and generating compact, conical beams, yielding an almost flat illumination of the imager focal plane. The calibration light is generated by narrow spectrum LEDs selected to cover the entire wavelength range of the imager. It is monitored in real time using control photodiodes. A first DICE demonstrator, SnDICE has been installed at CFHT. A second generation instrument (SkyDICE) has been installed in the enclosure of the SkyMapper telescope. We present the main goals of the project. We discuss the main difficulties encountered when trying to calibrate a wide field imager, such as MegaCam (or SkyMapper) using such a calibrated light source.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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