用于发射谱线研究的可调谐空间外差光谱仪的设计和建模
Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies
摘要：
空间外差光谱（Spatial Heterodyne Spectroscopy，SHS）是一种与傅里叶变换光谱类似的新型干涉技术，它继承了迈克耳孙干涉仪的优点。在SHS的输出处使用成像检测器来记录空间外差干涉图案。通过对所记录的干涉图进行傅里叶变换来获得源的光谱。SHS的优点-其设计，包括没有活动部件、紧凑、高吞吐量、高信噪比和瞬时光谱测量-使其既适用于空间，也适用于地面观测站。可调谐空间外差光谱仪（Tunable Spatial Heterodyne Spectrometer，TSHS）是一种新型的空间外差光谱仪。在本文中，我们描述的设计，开发和模拟的TSHS在折射配置适合光波长制度。在这里，我们使用分束器来分裂入射光相比，全反射SHS反射光栅分束。因此，与全反射SHS相比，该仪器的对准是简单的，其中折叠镜和屋顶镜用于组合光束。该仪器用于研究分辨能力在20000以上的微弱漫射扩展天体，通过调谐可以覆盖350 nm至700 nm的波长范围。与其他具有类似配置的仪器相比，它结构紧凑，坚固耐用。
英文摘要：
Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson Interferometer. An imaging detector is used at the output of a SHS to record the spatially-heterodyned interference pattern. The spectrum of the source is obtained by Fourier transforming the recorded interferogram. The merits of the SHS -- its design, including the absence of moving parts, compactness, high throughput, high SNR and instantaneous spectral measurements -- make it suitable for space as well as for ground observatories. The small bandwidth limitation of the SHS can be overcome by building it in tunable configuration (Tunable Spatial Heterodyne Spectrometer, TSHS). In this paper, we describe the design, development and simulation of a TSHS in refractive configuration suitable for optical wavelength regime. Here we use a beam splitter to split the incoming light compared with all--reflective SHS where a reflective grating does the beam splitting. Hence the alignment of this instrument is simple compared with all--reflective SHS where a fold mirror and a roof mirror are used to combine the beam. This instrument is intended to study faint diffuse extended celestial objects with a resolving power above 20000, and can cover a wavelength range from 350 nm to 700 nm by tuning. It is compact and rugged compared with other instruments having similar configurations.
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