Acoustothermic analyzer of microsamples in liquids

A new acoustic sensor of liquids based on the detection of temperature vari ations in an acoustic line during evaporation of microsamples (droplets) fr om its surface is proposed and studied. The dynamics of evaporation of deio nized water, spirit, acetone, and hexane droplets is studied, and the depen dencies of the acoustic response and the evaporation time on the sample vol ume are measured by using acoustic waves of the Rayleigh and surface types. It is shown that the magnitude and the sign of the response can be varied due to anisotropic properties of the temperature coefficient of the probing wave delay.