Fig. 1. Infrared absorption cross sections σ(vi,Tl) of lasers 1 and 2 versus temperature

Fig. 2. dR/dTl of lasers 1 and 2 versus temperature

Fig. 3. Schematic of two-wavelength DLAS liquid film measurement system

Fig. 4. Experimental results of validation by calibration tool. (a) Liquid film temperature; (b) liquid film thickness

Fig. 5. Time-dependent transmitted intensities during liquid film evaporation process and incident intensities at room temperature for lasers 1 and 2

Fig. 6. Time-resolved measurements of liquid film temperature and liquid film thickness during liquid film evaporation process obtained by different methods

Fig. 7. Shadow graphs at four specific instants during liquid film evaporation process. (a) t=960 s; (b) t=2280 s; (c) t=3000 s; (d) t=3600 s

Fig. 8. Experimental setup of dynamic liquid film measurement in flow channel

Fig. 9. Liquid film thickness and temperature in flow channel versus time for different liquid film temperatures. (a) Tw=308 K; (b) Tw=315 K; (c) Tw=323 K