期刊
SENSORS
卷 17, 期 11, 页码 -出版社
MDPI AG
DOI: 10.3390/s17112612
关键词
optical gas measurement; static Fourier transform spectroscopy; infrared spectroscopy; gas concentration; high-speed gas measurement; gas process monitoring; static single-mirror Fourier transform spectrometer
资金
- Federal Ministry for Economic Affairs and Energy of Germany
- German Research Foundation (DFG)
- Technical University of Munich (TUM)
Online monitoring of gases in industrial processes is an ambitious task due to adverse conditions such as mechanical vibrations and temperature fluctuations. Whereas conventional Fourier transform infrared (FTIR) spectrometers use rather complex optical and mechanical designs to ensure stable operation, static FTIR spectrometers do not require moving parts and thus offer inherent stability at comparatively low costs. Therefore, we present a novel, compact gas measurement system using a static single-mirror Fourier transform spectrometer (sSMFTS). The system works in the mid-infrared range from 650 cm(-1) to 1250 cm(-1) and can be operated with a customized White cell, yielding optical path lengths of up to 120 cm for highly sensitive quantification of gas concentrations. To validate the system, we measure different concentrations of 1,1,1,2-Tetrafluoroethane (R134a) and perform a PLS regression analysis of the acquired infrared spectra. Thereby, the measured absorption spectra show good agreement with reference data. Since the system additionally permits measurement rates of up to 200 Hz and high signal-to-noise ratios, an application in process analysis appears promising.
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