Abstract
In the present paper, the performances of an approach based on continuous wavelet transform to demodulate wavelength modulation spectroscopy harmonic signal (CWT-WMS) have been compared to the conventional approach using digital lock-in amplifier (DLI-WMS) based on classic Fourier transform analysis. For both methods, consistent results were obtained and good agreement between the experimental and simulated results was observed. The CWT method does not require the use of a reference signal and the phase-insensitive harmonic signals are directly obtained. The CWT method also demonstrates higher signal-to-noise ratio (SNR) and better temporal coherence than the DLI-WMS approach. The results obtained in the present study for \(\text{CO}_{{2}}\) in a gas cell and in a previous study for \(\text{H}_{{2}}\)O in a laminar flame tend to indicate that the parameters of the CWT-WMS method could be used for a large variety of experimental conditions and target species without requiring important adjustment. On the other hand, the DLI-WMS method presents a benefit in term of computational time which is \(47.9\%\) shorter than for the CWT-WMS.
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Notes
The harmonic wavelet is one type of wavelet which was created by Newland [51].
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Acknowledgements
Funding for this research was provided by Tsinghua-Foshan Innovation Special Fund (TFISF), Grant number 2020THFS0108, and National Natural Science Foundation of China (NSFC), Grant number 51976105. Wavelet software was provided by C. Torrence and G. Compo, and is available at URL: http://paos.colorado.edu/research/wavelets/.
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Li, Z., Wang, Z., Mével, R. et al. Fourier and wavelet transform analysis of wavelength modulation spectroscopy signal. Appl. Phys. B 128, 109 (2022). https://doi.org/10.1007/s00340-022-07834-7
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DOI: https://doi.org/10.1007/s00340-022-07834-7