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.
Availability of numerical model providing reliable estimation of the parameters of ablation processes induced by extreme ultraviolet laser pulses in the range of nanosecond and sub-picosecond timescales is highly desirable for recent experimental research as well as for practical purposes. Performance of the one-dimensional thermodynamic code (XUV-ABLATOR) in predicting the relationship of ablation rate and laser fluence is investigated for three reference materials: (i) silicon, (ii) fused silica and (iii) polymethyl methacrylate. The effect of pulse duration and different material properties on the model predictions is studied in the frame of this contribution for the conditions typical for two compact laser systems operating at 46.9 nm. Software implementation of the XUV-ABLATOR code including graphical user's interface and the set of tools for sensitivity analysis was developed. Global sensitivity analysis using high dimensional model representation in combination with quasi-random sampling was applied in order to identify the most critical input data as well as to explore the uncertainty range of model results.
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