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4723563 
Journal Article 
Application of a tunable Fabry-Perot filtometer to mid-infrared gas sensing 
Gasser, C; Genner, A; Moser, H; Ofner, J; Lendl, B 
2017 
1 
Sensors and Actuators B: Chemical
ISSN: 0925-4005
EISSN: 1873-3077 
242 
9-14 
WOS:000393267700002 
The design and application of a versatile, tunable filtometer based on a Fabry-Perot (FP) tunable filter detector, covering the spectral range from 1250 to 1850 cm(-1) at a spectral resolution of approximately 30 cm(-1), is presented. The tunable filter was characterized and calibrated using a FTIR spectrometer. Gas mixtures comprising iso-butane, 1-butene, 1,3- butadiene were prepared and measured. The obtained gas spectra were validated by FTIR measurements. Quantitative analysis based on the whole tuning range of the filtometer and employing partial least squares (PLS) calibration revealed fully satisfactory results with root mean square error of prediction (RMSEP) of 0.03, 0.04 and 0.26% for iso-butane, 1-butene and 1,3 butadiene respectively. As the tunable FP filtometer also allows measurements at pre-selected spectral windows a calibration based on multiple linear regression (MLR) was performed as well obtaining similar results. The results clearly show that tunable Fabry-Perot filters can be used in a new generation of filtometers and provide a low-cost option for the quantitative and fast multicomponent gas sensing. (C) 2016 Elsevier B.V. All rights reserved. 
Infrared spectroscopy; Gas monitoring; Fabry-Perot interferometer; Multivariate analysis; Process analytical chemistry