论文标题
使用中红外波形跟踪的紧凑型太空浸入式冰球光谱仪的光谱分辨能力的模拟
Simulations of the Spectral Resolving Power of a Compact Space-Borne Immersion-Echelle Spectrometer Using Mid-Infrared Wave Tracing
论文作者
论文摘要
我们在中红外波长上进行了基于波磁的数值模拟，以研究如何存在一个紧凑的，高光谱的分辨率光谱仪的光谱分辨率$ r $含有浸入式eChelle-echelle-echelle-echelle碎片。我们测试了三例望远镜畸变（无畸变，散光和球形畸变），假设宇宙学和天体物理学（SPICA）的空间红外望远镜（SPICA）的畸变预算，该预算具有20- $ \ $ \ MATHRM {μmmm} $ - 波长 - 波长扩散限制。在有裂缝的情况下，我们发现$ r $的值约为10--20 $ \ mathrm {μm} $近似独立于假定的畸变，这与几何光学的预测有很大不同。我们的结果还表明，从狭缝中衍射的衍射可以通过扩大光栅窗口上的有效照明区域来改善$ r $，并且这种改进在短波长下会减少。对于无缝隙案件，我们发现，可以使用Strehl比率大致估算畸变对$ r $的影响。
We performed wave-optics-based numerical simulations at mid-infrared wavelengths to investigate how the presence or absence of entrance slits and optical aberrations affect the spectral resolving power $R$ of a compact, high-spectral-resolving-power spectrometer containing an immersion-echelle grating. We tested three cases of telescope aberration (aberration-free, astigmatism and spherical aberration), assuming the aberration budget of the Space Infrared Telescope for Cosmology and Astrophysics (SPICA), which has a 20-$\mathrm{μm}$-wavelength diffraction limit. In cases with a slit, we found that the value of $R$ at around 10--20 $\mathrm{μm}$ is approximately independent of the assumed aberrations, which is significantly different from the prediction of geometrical optics. Our results also indicate that diffraction from the slit improves $R$ by enlarging the effective illuminated area on the grating window and that this improvement decreases at short wavelengths. For the slit-less cases, we found that the impact of aberrations on $R$ can be roughly estimated using the Strehl ratio.
