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arXiv 2203.11297astro-ph.IM
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少模远红外光栅光谱仪部分相干特性的模拟

Modelling the Partially Coherent Behaviour of Few-Mode Far-Infrared Grating Spectrometers

B. N. R. Lap, S. Withington, W. Jellema, D. A. Naylor

摘要:

对超低噪声远红外光栅光谱仪进行建模已成为下一代远红外空间天文台的关键。由于入射光谱场的部分相干形式以及光学器件和探测器的少模响应,传统技术难以应用。我们提出了一种模态技术,用于建模的光谱仪的行为,它允许部分相干场的传播和检测,并列入由温暖的内表面辐射的杂散光。我们说明了该技术通过建模的行为的长波长波段的建议SAFARI仪器上研究的SPICA任务。

英文摘要:

Modelling ultra-low-noise far-infrared grating spectrometers has become crucial for the next generation of far-infrared space observatories. Conventional techniques are awkward to apply because of the partially coherent form of the incident spectral field, and the few-mode response of the optics and detectors. We present a modal technique for modelling the behaviour of spectrometers, which allows for the propagation and detection of partially coherent fields, and the inclusion of straylight radiated by warm internal surfaces. We illustrate the technique by modelling the behaviour of the Long Wavelength Band of the proposed SAFARI instrument on the well-studied SPICA mission.

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