A technique for planar measurement of size, velocity, liquid volume, and surface area of droplet clusters in sprays and the identification of fluid flow structures, which might be responsible for droplet clustering, is reported. The technique was applied in water spray, which was injected in the airflow of burner for 0.1-MW domestic boiler. Rhodamine B dye was added in the liquid at appropriately adjusted concentration to ensure volume dependency of the fluorescence intensity. Combined droplet laser-induced fluorescence and Mie scattering images were recorded, using two charge-coupled device cameras and appropriate optical filtering. The ratio of the two light intensity images allowed measurement of instantaneous spatial distribution of droplet Sauter mean diameter. The droplet velocity field was measured by cross-correlation techniques from the Mie scattering and fluorescence intensity images and agreed well with the velocity of mean droplet diameters corresponding to the area mean diameter D 20 and volume mean diameter D 30 , respectively, as measured with the phase Doppler technique. It was found that droplet clusters formed in the central region of the spray where the droplet density was high and droplet sizes small. The identified droplet clusters were tracked between time-delayed images and their displacement and cluster velocity quantified, which was in good agreement with corresponding phase Doppler measurements. In the vicinity of droplet clusters, airflow structures were identified, using particle image velocimetry, which might be responsible for the formation of droplet clusters.