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Thermal stabilization of static single-mirror Fourier transform spectrometers

机译：静态单镜傅立叶变换光谱仪的热稳定性

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摘要

Fourier transform spectroscopy has become a standard method for spectral analysis of infrared light. With this method, an interferogram is created by two beam interference which is subsequently Fourier-transformed. Most Fourier transform spectrometers used today provide the interferogram in the temporal domain. In contrast, static Fourier transform spectrometers generate interferograms in the spatial domain. One example of this type of spectrometer is the static single-mirror Fourier transform spectrometer which offers a high etendue in combination with a simple, miniaturized optics design. As no moving parts are required, it also features a high vibration resistance and high measurement rates. However, it is susceptible to temperature variations. In this paper, we therefore discuss the main sources for temperature-induced errors in static single-mirror Fourier transform spectrometers: changes in the refractive index of the optical components used, variations of the detector sensitivity, and thermal expansion of the housing. As these errors manifest themselves in temperature-dependent wavenumber shifts and intensity shifts, they prevent static single-mirror Fourier transform spectrometers from delivering long-term stable spectra. To eliminate these shifts, we additionally present a work concept for the thermal stabilization of the spectrometer. With this stabilization, static single-mirror Fourier transform spectrometers are made suitable for infrared process spectroscopy under harsh thermal environmental conditions. As the static single-mirror Fourier transform spectrometer uses the so-called source-doubling principle, many of the mentioned findings are transferable to other designs of static Fourier transform spectrometers based on the same principle.
机译：傅里叶变换光谱法已经成为红外光谱分析的标准方法。利用这种方法，由两束干涉产生干涉图，随后对其进行傅立叶变换。当今使用的大多数傅立叶变换光谱仪在时域中提供干涉图。相反，静态傅立叶变换光谱仪在空间域中生成干涉图。这种类型的光谱仪的一个示例是静态单镜傅立叶变换光谱仪，它结合了简单的小型化光学设计，提供了高集光率。由于不需要活动部件，因此它还具有较高的抗振性和较高的测量速率。但是，它容易受温度变化的影响。因此，在本文中，我们讨论了静态单镜傅立叶变换光谱仪中温度引起的误差的主要来源：所用光学组件的折射率变化，检测器灵敏度的变化以及外壳的热膨胀。由于这些误差表现在与温度相关的波数偏移和强度偏移中，因此它们会阻止静态单镜傅立叶变换光谱仪提供长期稳定的光谱。为了消除这些变化，我们另外提出了一种用于光谱仪热稳定的工作方案。有了这种稳定性，静态单镜傅立叶变换光谱仪就适合在恶劣的热环境条件下进行红外过程光谱分析。由于静态单镜傅立叶变换光谱仪使用所谓的源倍增原理，因此许多提到的发现都可以转移到基于相同原理的静态傅立叶变换光谱仪的其他设计中。

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