<abstract xmlns="http://www.w3.org/1999/xhtml">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.</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.

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

Measurement Science Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

This communication reports technical notes on the development and application of an automated line-shape fitting procedure for wavelength modulation...

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

Online veröffentlicht: 14. Aug. 2018

Seitenbereich: 158 - 161

Eingereicht: 19. Jan. 2018

Akzeptiert: 25. Juli 2018

DOI: https://doi.org/10.1515/msr-2018-0022

Schlüsselwörter
gas sensing, spectroscopy, modulation, model, line-shape asymmetry

© 2018 Václav Nevrlý, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

Online veröffentlicht: 14. Aug. 2018

Seitenbereich: 158 - 161

Eingereicht: 19. Jan. 2018

Akzeptiert: 25. Juli 2018

DOI: https://doi.org/10.1515/msr-2018-0022

Schlüsselwörtergas sensing, spectroscopy, modulation, model, line-shape asymmetry

© 2018 Václav Nevrlý, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Schlüsselwörter
gas sensing, spectroscopy, modulation, model, line-shape asymmetry