Abstract
As the result of free surface deformation during laser-induced thermocapillary convection process near-surface flow velocity vector has a non-zero projection on direction laser beam spreads. This property of liquid flow allows to measure the velocity of near-surface mass flow using the backscatter signal from surface particle inclusions and rippling induced by surface tension gradient. Similar to coherent Doppler wind lidar scheme measurements can be formed by high intensity irradiating a target surface (with consequent phase transition in the boundary layer zone) and observing the Doppler shift in the frequency of the radiation backscattered from scatters within interaction region. We have proposed the monostatic interaction scheme. In this case interaction and probe regions are equivalent precisely. Our paper is devoted in investigation of laser-induced-near-surface thermocapillary convection flow in such target materials as water, paraffin, naphthalene, ehyl alcohol and oil using Doppler backscattered signal detected by heterodyne method.
Published Version
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