Fig. 1. Gas flow device of turbulent calibration system

Fig. 2. Radical generation device of turbulent calibration system

Fig. 3. (a) The relationship between oxygen absorption cross-section and O₂ column concentration; (b) The comparison of water vapor concentration measured by dew point hygrometer and humidity & temperature probe; (c) The relationship between the change of mercury lamp intensity and the concentration of water vapor column

Fig. 4. The relationship between the mercury lamp intensity and O₃ concentration

Fig. 5. The relationship between the intensity of mercury lamp and (a) HO₂ fluorescence signal, (b) OH fluorescence signal detected by FAGE system

Fig. 6. The concentration of OH radicals produced by the turbulent calibration system corresponds to the fluorescence count detected by FAGE system