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We have developed a combination of light scattering techniques to study andcharacterize droplets of a ultrasonic spray printer or coater in flight. Forthis economically relevant printer there is so far no reliable technique tosystematically adjust the experimental parameters. We have combined photoncorrelation spectroscopy and turbidimetry to determine size and speed of thedroplets depending on parameters of the printing process as viscosity,concentration and speed of the driving shroud gas. Our method allows topredetermine these parameters to control the properties of the printed films ase.g. thickness from tens of nanometers to micrometers.

Velocity and size measurement of droplets from an ultrasonic spray coater using Photon Correlation Spectroscopy and Turbidimetry