A new line-shape asymmetry model for wavelength modulation spectroscopy in gaseous flows-Reference-Cited by-同舟云学术

A new line-shape asymmetry model for wavelength modulation spectroscopy in gaseous flows

Published:2018-08-01 Issue:4 Volume:18 Page:158-161
ISSN:1335-8871
Container-title:Measurement Science Review
language:en
Short-container-title:

Author:

Nevrlý Václav¹,Klečka Vít¹,Vašinek Michal²,Válek Václav¹,Suchánek Jan³,Dostál Michal⁴³,Hric Branislav¹,Bitala Petr¹,Zelinger Zdenĕk³

Affiliation:

1. Faculty of Safety Engineering, VŠB-Technical University of Ostrava, Lumírova, 13, Ostrava-Výškovice , Czech Republic

2. Faculty of Electrical Engineering and Computer Science , VŠB-Technical University of Ostrava, 17. listopadu, 15, 708 33, Ostrava-Poruba , Czech Republic

3. J. Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, Dolejškova, 2155/3, Prague , Czech Republic

4. Faculty of Safety Engineering, VŠB-Technical University of Ostrava, Lumírova, 13, 700 30, Ostrava-Výškovice , Czech Republic

Abstract

Abstract This communication reports technical notes on the development and application of an automated line-shape fitting procedure for wavelength modulation spectroscopy (WMS). Near-infrared transitions of carbon dioxide (CO2) around 1573 nm were measured in vertical cold (nonreacting) flow of CO2 at atmospheric pressure using WMS with demodulation at second harmonic frequency. Semi-empirical model based on the set of so-called Gabor functions was developed and parameters of Lorentzian line-shape profile and its asymmetry resulting from simultaneous frequency and amplitude response of the current-modulated semiconductor laser were determined. Nonlinear least-square fitting procedure employing differential evolution algorithm was successfully utilized for performing this task. Line-shape fitting procedure enabling efficient signal de-noising and background subtraction of wavelength modulation spectra was implemented into an open-source code.

Publisher

Walter de Gruyter GmbH

Subject

Instrumentation,Biomedical Engineering,Control and Systems Engineering

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