Static Fourier transform mid-infrared spectrometer with continuous background correction

Michael H. Köhler; Michael Schardt; Hamza B. Ghazala; Ennio Colicchia; Patrick Kienle; Xingchen Dong; Kun Wang; Alexander W. Koch

doi:10.1117/12.2528404

3 September 2019 Static Fourier transform mid-infrared spectrometer with continuous background correction

Michael H. Köhler, Michael Schardt, Hamza B. Ghazala, Ennio Colicchia, Patrick Kienle, Xingchen Dong, Kun Wang, Alexander W. Koch

Author Affiliations +

Proceedings Volume 11102, Applied Optical Metrology III; 1110218 (2019) https://doi.org/10.1117/12.2528404
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

In this contribution we present a broadband static Fourier transform spectrometer (bsFTS) based on a single- mirror interferometer containing only off-the-shelf optical components and an uncooled microbolometer detector array. The system uses concave mirrors instead of lenses and therefore covers a wide spectral range from 3.6 μm to 17 μm at a spectral resolution of 12 cm^-1. Furthermore, dispersion effects can be minimized and the system can thus be designed with increased temperature stability. We demonstrate the optical and mechanical design of the current laboratory prototype and compare the instrument to a scanning Fourier transform infrared (FTIR) spectrometer. Additionally, we present a technique for simultaneously acquiring the sample spectrum and the background spectrum. Thereby, a variation of the background over time can be compensated continuously and hence the bsFTS presented in this contribution offers significant potential with regard to long-term stability.

Citation Download Citation

Michael H. Köhler, Michael Schardt, Hamza B. Ghazala, Ennio Colicchia, Patrick Kienle, Xingchen Dong, Kun Wang, and Alexander W. Koch "Static Fourier transform mid-infrared spectrometer with continuous background correction", Proc. SPIE 11102, Applied Optical Metrology III, 1110218 (3 September 2019); https://doi.org/10.1117/12.2528404

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KEYWORDS

Mirrors

Spectroscopy

Sensors

Fourier transforms

Beam splitters

FT-IR spectroscopy

Light sources

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