Applications of wavelets in the photoacoustic detection of trace gases with noisy signals

Authors

  • Martín Germán González GLOMAE-FIUBA y CONICET
  • Guillermo Daniel Santiago Universidad de Buenos Aires
  • Verónica Slezak CITEDEF
  • Alejandro Peuriot CITEDEF

DOI:

https://doi.org/10.37537/rev.elektron.2.1.35.2018

Keywords:

Photoacoustic Spectroscopy, trace gases, wavelets

Abstract

This paper shows that the use of filters based on the discrete wavelet transform (DWT) improves the sensitivity of photoacoustic systems for measurement of trace gases under conditions of unfavorable signal-to-noise ratio (SNR). To achieve this goal, a filter based on Meyer's DWT was designed and tested with simulated and measured signals. For the measurements, a system  for the detection of traces of sulfur hexafluoride in nitrogen using a pulsed CO2 laser was implemented. From the results it was obtained that the use of DWT had a very good performance for signals generated with low laser energies ( < 100 uJ) corrupted with impulsive electromagnetic noise.

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References

A. Peuriot, G. Santiago, and V. Slezak, Modelado, metodos de adquisición y procesamiento en la espectroscopía fotoacústica en gases, ser. Láseres: Desarrollos y Aplicaciones. Tomo 2., L. Azcarate, P. Diodati, E. Quel, and V. Slezak, Eds. Buenos Aires, Argentina: UNSAMedita, 2007.

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A. Peuriot, G. Santiago, and V. Slezak, “Simulacion y caracterización de una celda optoacústica unidimensional,” ´ Anales AFA, vol. 15, pp. 90–93, 2003.

J. Mao, P. Sun, Z. Pan, Q. Su, and Z. Maosen, “Wavelet analysis on photoacoustic spectra of degradated pvc,” Fresenius J. Anal. Chem., vol. 361, pp. 140–142, 1998.

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Published

2018-05-09

Issue

Vol. 2 No. 1 (2018)

Section

Signal Processing

License

The authors who publish in this journal agree with terms established in the license Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

How to Cite

[1]
M. G. González, G. D. Santiago, V. Slezak, and A. Peuriot, “Applications of wavelets in the photoacoustic detection of trace gases with noisy signals”, Elektron, vol. 2, no. 1, pp. 26–29, May 2018, doi: 10.37537/rev.elektron.2.1.35.2018.