未来宇宙学项目BISOU的光学概念模型
Optical concept model of the future cosmology project BISOU
AI总结：
本文介绍了未来宇宙学项目BISOU的光学概念模型，其为测量CMB光谱畸变的空间任务的气球载探路者光谱仪，采用差分偏振FTS，经光学分析确定系统构型并开展相关分析。
AI中文摘要：
我们对BISOU（原初宇宙光谱观测气球干涉仪）进行了光学分析，BISOU是一款天文气球载探路者光谱仪，作为未来空间任务的筹备研究一部分开发，该空间任务旨在测量宇宙微波背景（CMB）的光谱畸变。BISOU光学系统基于差分偏振傅里叶变换光谱仪（FTS），接收来自朝向天空的望远镜和内部校准源的输入。FTS焦平面配备与多模馈电喇叭耦合的热辐射计探测器，分别有专用焦平面覆盖低频（90-300GHz）和高频（0.3-1.5THz）波段。该光学分析首先依赖光线追迹模拟确定系统整体构型，之后开展更深入的高斯光束和物理光学分析。
英文摘要：
We present an optical analysis of BISOU (Balloon Interferometer for Spectral Observations of the primordial Universe), an astronomical balloon-borne pathfinder spectrometer developed as part of a preparatory study for a future space mission aiming at measuring spectral distortions of the cosmic microwave background (CMB). The BISOU 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 are equipped with bolometric detectors coupled to multimode feed horns, with distinct focal planes dedicated to the low (90 - 300GHz) and high (0.3 - 1.5THz) frequency bands. 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.
