A new line-shape asymmetry model for wavelength modulation spectroscopy in gaseous flows
| Autor: | Michal Vašinek, Zdeněk Zelinger, Jan Suchánek, V. Valek, Václav Nevrlý, Petr Bitala, Vít Klečka, Michal Dostál, Branislav Hric |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
gas sensing
spectroscopy Materials science 010504 meteorology & atmospheric sciences media_common.quotation_subject Biomedical Engineering 01 natural sciences Asymmetry 010309 optics Optics 0103 physical sciences QA1-939 Spectroscopy Instrumentation 0105 earth and related environmental sciences media_common Line (formation) model business.industry line-shape asymmetry Wavelength modulation spectroscopy modulation Control and Systems Engineering Modulation business Mathematics |
| Zdroj: | Measurement Science Review, Vol 18, Iss 4, Pp 158-161 (2018) |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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