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Thermal stabilization of static single-mirror Fourier transform spectrometers

机译：静态单镜傅里叶变换光谱仪的热稳定

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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：傅里叶变换光谱已成为红外光谱分析的标准方法。利用这种方法，通过两个波束干扰产生干涉图，其随后是傅里叶变换的。今天使用的大多数傅里叶变换光谱仪在时间域中提供干扰图。相反，静态傅里叶变换光谱仪在空间域中生成干扰图。这种类型的光谱仪的一个例子是静态单镜傅里叶变换光谱仪，其提供了高精度，与简单的小型化光学设计结合使用。由于不需要移动部件，它还具有高抗振性和高测量速率。然而，它易受温度变化的影响。在本文中，我们讨论了静态单镜傅立叶变换光谱仪中温度诱导误差的主要来源：所使用的光学元件的折射率的变化，探测器灵敏度的变化以及壳体的热膨胀。由于这些错误在温度相关的波数移位和强度移位中表现出来，因此防止静态单镜傅立叶变换光谱仪传递长期稳定光谱。为了消除这些换档，我们还提供了一种用于光谱仪热稳定的工作概念。通过这种稳定，静态单镜傅里叶变换光谱仪适用于在苛刻的热环境条件下的红外过程光谱。由于静态单镜傅里叶变换光谱仪使用所谓的源倍增原理，因此许多所提到的发现基于相同的原理可转换为静态傅里叶变换光谱仪的其他设计。

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