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C. Gasser, A. Genner, H. Moser, J. Ofner, B. Lendl:
"Application of a tunable Fabry-Pérot filtometer to mid-infrared gas sensing";
Sensors and Actuators B: Chemical, 242 (2017), 242; 9 - 14.

tThe design and application of a versatile, tunable filtometer based on a Fabry-Pérot (FP) tunable filter -detector, covering the spectral range from 1250 to 1850 cm−1at a spectral resolution of approximately30 cm−1, is presented. The tunable filter was characterized and calibrated using a FTIR spectrometer. Gasmixtures comprising iso-butane, 1-butene, 1,3- butadiene were prepared and measured. The obtainedgas spectra were validated by FTIR measurements. Quantitative analysis based on the whole tuning rangeof the filtometer and employing partial least squares (PLS) calibration revealed fully satisfactory resultswith root mean square error of prediction (RMSEP) of 0.03, 0.04 and 0.26% for iso-butane, 1-buteneand 1,3 butadiene respectively. As the tunable FP filtometer also allows measurements at pre-selectedspectral windows a calibration based on multiple linear regression (MLR) was performed as well obtainingsimilar results. The results clearly show that tunable Fabry-Pérot filters can be used in a new generationof filtometers and provide a low-cost option for the quantitative and fast multicomponent gas sensing.

Infrared spectroscopy, Gas monitoring, Fabry-Perot interferometer, Multivariate analysis, Process analytical chemistry

http://dx.doi.org/10.1016/j.snb.2016.11.016