CO2 laser photoacoustic spectrometry: sensitivity and drift analysis

Jan Skřínský; Zdeněk Zelinger; Václav Nevrlý; Tomáš Hejzlar; Barbora Baudišová; Petr Bitala

doi:10.1117/12.2020407

13 May 2013 CO₂ laser photoacoustic spectrometry: sensitivity and drift analysis

Jan Skřínský, Zdeněk Zelinger, Václav Nevrlý, Tomáš Hejzlar, Barbora Baudišová, Petr Bitala

Proceedings Volume 8788, Optical Measurement Systems for Industrial Inspection VIII; 878823 (2013) https://doi.org/10.1117/12.2020407
Event: SPIE Optical Metrology 2013, 2013, Munich, Germany

Abstract

Trace gas measurements were performed by the eddy correlation technique. The time domain stability criterion for laminar and turbulent flows measured in the street canyon model was determined. The evaluation of the instrument performance was done by the concentration measurements (CH₃OH, C₂H₅OH). The Allan and Hadamard variance methods were used for stability analysis. The dependence of variances on different degrees of flow turbulence was evaluated. The influence of turbulence on the optimal averaging time for minimum detectable concentrations has been studied. The stability analysis of experimental set up consisting of the CO₂ laser photoacoustic detection and the simulated atmosphere in a wind tunnel was performed for different sample concentrations and flows. The sensitivity and stability analysis were determined by 1000 s, 2000 s and 10 000 s measurements.

Citation Download Citation

Jan Skřínský, Zdeněk Zelinger, Václav Nevrlý, Tomáš Hejzlar, Barbora Baudišová, and Petr Bitala "CO₂ laser photoacoustic spectrometry: sensitivity and drift analysis", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 878823 (13 May 2013); https://doi.org/10.1117/12.2020407

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