用准直光束投影仪测量望远镜的透射率
Measurement of telescope transmission using a Collimated Beam Projector
摘要：
随着越来越多的Ia型超新星被当代巡天望远镜探测到，以及即将到来的鲁宾天文台时空遗产巡天的预期，宇宙学测量的精度将受到通量校准的系统不确定性的限制，而不是统计噪声。在确定Ia超新星颜色演变（距离估计所需）时，系统误差的一个主要来源是望远镜传输的不确定性，包括巡天内和巡天之间。我们在这里介绍准直光束投影仪（CBP），这是为了测量望远镜的传输与准直光。与基于平场的仪器相比，准直光束更接近地模仿恒星波前，从而允许更精确地处理系统误差，例如来自重影和滤波器入射角依赖性的那些系统误差。作为一个概念的证明，我们提出了CBP测量的StarDICE原型望远镜，实现了标准（1西格玛）的不确定性平均在整个波长范围内测量单光束照明。
英文摘要：
With the increasingly large number of type Ia supernova being detected by current-generation survey telescopes, and even more expected with the upcoming Rubin Observatory Legacy Survey of Space and Time, the precision of cosmological measurements will become limited by systematic uncertainties in flux calibration rather than statistical noise. One major source of systematic error in determining SNe Ia color evolution (needed for distance estimation) is uncertainty in telescope transmission, both within and between surveys. We introduce here the Collimated Beam Projector (CBP), which is meant to measure a telescope transmission with collimated light. The collimated beam more closely mimics a stellar wavefront as compared to flat-field based instruments, allowing for more precise handling of systematic errors such as those from ghosting and filter angle-of-incidence dependence. As a proof of concept, we present CBP measurements of the StarDICE prototype telescope, achieving a standard (1 sigma) uncertainty of 3 % on average over the full wavelength range measured with a single beam illumination.
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