IR-thermography of evaporating acoustically levitated drops

The surface temperature of evaporating acoustically levitated drops has been monitored by IR-thermography. The thermography system has been calibrated by simultaneous measurements with a thin thermocouple. The integral IR-emission coefficients of a few pure liquids have been derived. Evaporation processes of pure liquids and of binary mixtures of liquids have been studied with levitated drops. Using drop surface temperatures, we were able to calculated analytically binary gas-diffusion coefficients of liquids in ambient air.