Retrieval of weak non-resonant photoacoustic signal with the chaotic oscillator algorithm

Photoacoustic (PA) spectroscopic technique has become a popular tool for trace gas detection and is especially suitable for in situ measurement of sulfur hexafluoride (SF 6 ) decomposition components in gas insulated switchgear (GIS). However, the concentrations of SF 6 decomposition components are...

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Veröffentlicht in:Optics express 2021-08, Vol.29 (17), p.26509-26525
Hauptverfasser: Luo, Jing, Mou, Fusheng, Sun, Youwen, Li, Suwen
Format: Artikel
Sprache:eng
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Zusammenfassung:Photoacoustic (PA) spectroscopic technique has become a popular tool for trace gas detection and is especially suitable for in situ measurement of sulfur hexafluoride (SF 6 ) decomposition components in gas insulated switchgear (GIS). However, the concentrations of SF 6 decomposition components are generally very low and the resulting PA signals are too weak to be accurately retrieved with traditional methods. In this study, we proposed a Lyapunov exponent based chaotic oscillator algorithm to retrieve the weak PA signals of SF 6 decomposition components. Retrieval of weak PA signals from strong noise background was achieved for both simulation and measurement perspectives. The results were compared with those based on phase-locked amplification technique. Both simulation and measurement results concluded that the proposed chaotic oscillator algorithm is superior to the phase-locked amplification in terms of accuracy, sensitivity and stability. Since most trace gases have weak absorption signatures in the atmosphere (below 1%), this study can provide valuable insights in dealt with such weak signals in remote sensing of atmosphere.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.431548