Abstract
Number density of droplets in an aerosol ejected from a spray nozzle is experimentally measured by laser-induced breakdown. This measurement utilizes the large difference of the breakdown threshold intensities between droplets and air. The volume in which the intensity exceeds the breakdown threshold for droplets is evaluated from the breakdown threshold and the actual laser intensities, and laser focusing parameters. The number of droplets in the volume is evaluated by the breakdown probability and Poisson distribution. This method has high temporal and spatial resolution depending on the laser pulse duration and the laser focusing condition, respectively.
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