Potential of digital holography in sprays measurement

This study presents in-line digital particle holography and its application to spray droplets to measure the characteristics of spray droplets. Several important parameters at the time of hologram recording such as the pixel number of holograms, the object distance, and the part of laser beam used were verified. The optimum values of all these parameters are obtained by either numerical simulation of holograms or experiments. Using these optimum parameters, two digital spray holograms in a short time interval are recorded with the synchronization system for the time control. The three dimensional droplet velocities and several important features of spray droplets can be easily located.