AO辅助冠状动脉造影鉴别成像的端到端模拟：SPHERE的性能评估
End to End Simulation of AO-assisted coronagraphic differential imaging: estimation of performance for SPHERE
摘要：
SPHERE（Spectro Polarimetric High Contrast Exoplanet Research）是VLT的行星探测仪器，旨在研究年轻恒星或附近恒星周围相对明亮的太阳系外巨行星。SPHERE是一套由同一AO系统供电的三台仪器，其中两台共用同一个日冕仪。利用傅里叶光学对该复杂系统进行建模，研究了整个仪器的性能。反过来，这种端到端模型有助于分析对各种参数（WFE，日冕仪的对准，差分像差）的灵敏度，并对子系统进行一些规范。本文给出了SPHERE的主要观测模式：相当于光谱差分成像技术的双波段成像（DBI）的灵敏度分析和仪器对比度性能随通量变化的一些例子。
英文摘要：
SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch), the planet finder instrument for the VLT is designed to study relatively bright extrasolar giant planets around young or nearby stars. SPHERE is a set of three instruments fed by the same AO-system, two of them share the same coronagraph. This complex system has been modeled with Fourier Optics to investigate the performance of the whole instrument. In turns, this end-to-end model was useful to analyze the sensitivity to various parameters (WFE, alignment of the coronagraph, differential aberrations) and to put some specifications on the sub-systems. This paper presents some example of sensitivity analysis and some contrast performance of the instruments as a function of the flux for the main observing mode of SPHERE: the Dual Band Imaging (DBI), equivalent to the Spectral Differential Imaging technique.
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