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