BISOU breadboard的光学研制
Optical development of the BISOU breadboard
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中文总结 AI 辅助
该研究介绍了用于未来CMB空间任务筹备的BISOU原理样机的光学系统研制，采用差分偏振FTS等技术开展光学分析，为仪器系统误差表征提供支撑。
中文摘要 AI 辅助
BISOU（原初宇宙光谱观测气球干涉仪）是一款天文气球搭载的探路者设备，作为未来旨在测量宇宙微波背景（CMB）光谱畸变的空间任务筹备研究的一部分而开发。法国空间天体物理研究所（IAS）正在研制该仪器的实验室 breadboard（ breadboard 指原理样机），用于表征子系统及仪器系统误差，尤其是光学系统的误差。该光学系统基于差分偏振傅里叶变换光谱仪（FTS），接收来自对空望远镜和内部校准源的输入。FTS的焦平面包含耦合到多模馈源喇叭的亚开尔文探测器。借助二向色镜，覆盖90至1500 GHz的全光谱带被划分为两个子频带。光学分析首先依赖光线追迹模拟确定系统整体配置，随后进行更高级的高斯光束和物理光学分析。
英文摘要
BISOU (Balloon Interferometer for Spectral Observations of the primordial Universe) is an astronomical balloon-borne pathfinder developed as part of a preparatory study for a future space mission aimed at measuring spectral distortions of the cosmic microwave background (CMB). A laboratory breadboard of the instrument is being developed at the Institut d'Astrophysique Spatiale (IAS), enabling the characterization of subsystems and instrument systematic effects, particularly in the optical system. The optical system is based on a differential polarizing Fourier Transform Spectrometer (FTS) that receives inputs from both a sky-facing telescope and an internal calibration source. The FTS focal planes include sub-K detectors coupled to multimode feed horns. The full spectral band, spanning between 90 and 1500 GHz, is sub-divided into two frequency sub-bands, thanks to the use of a dichroic. The optical analysis first relies on ray-tracing simulations to establish the overall configuration of the system, before proceeding to more advanced Gaussian beam and physical optics analyses.
