Compact static Fourier transform spectrometer for time-resolved mid-infrared spectroscopy

Michael H. Köhler; Bastian C. Vauth; Clara J. Kiesselbach; Xingchen Dong; Kun Wang; Patrick Kienle; Michael Schardt; Carsten Giebeler; Benjamin R. Wiesent; Alexander W. Koch

doi:10.1117/12.2571489

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20 September 2020 Compact static Fourier transform spectrometer for time-resolved mid-infrared spectroscopy

Michael H. Köhler, Bastian C. Vauth, Clara J. Kiesselbach, Xingchen Dong, Kun Wang, Patrick Kienle, Michael Schardt, Carsten Giebeler, Benjamin R. Wiesent, Alexander W. Koch

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Proceedings Volume 11537, Electro-Optical and Infrared Systems: Technology and Applications XVII; 1153707 (2020) https://doi.org/10.1117/12.2571489
Event: SPIE Security + Defence, 2020, Online Only

Abstract

In this contribution we introduce a compact version of a broadband static Fourier transform spectrometer (bs- FTS) for the mid-infrared spectral range. The bsFTS covers a spectral range from about 4.5 µm to 14 µm, respectively 2220 cm⁻¹ to 700 cm⁻¹ at a spectral resolution of 8 cm⁻¹. As, in contrast to scanning Fourier trans- form spectrometers, the interferogram is modulated not over time but in the spatial domain, the measurement speed is only limited by the detector. This allows for infrared spectroscopy at 25 Hz to 200 Hz using uncooled microbolometer arrays. Besides liquid measurements in attenuated total reflection (ATR), demonstrating the accuracy and linearity of the bsFTS, we show time-resolved analyses of 1,1,1,2-Tetrafluoroethane (R134a) and carbon monoxide test gases to prove the suitability of the system for high-speed spectroscopy.

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Michael H. Köhler, Bastian C. Vauth, Clara J. Kiesselbach, Xingchen Dong, Kun Wang, Patrick Kienle, Michael Schardt, Carsten Giebeler, Benjamin R. Wiesent, and Alexander W. Koch "Compact static Fourier transform spectrometer for time-resolved mid-infrared spectroscopy", Proc. SPIE 11537, Electro-Optical and Infrared Systems: Technology and Applications XVII, 1153707 (20 September 2020); https://doi.org/10.1117/12.2571489

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