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Measurements of the characteristics of spray droplets using in-line digital particle holography Yan Yang
The Journal of Mechanical Science and Technology, vol. 23, no. 6, pp.1670-1679, 2009
Abstract : In-line digital particle holography is applied to measure the characteristics of spray droplets. Common reconstruction
methods were considered and the best one was selected. Several important parameters at the time of hologram
recording, such as the object distance and the region of laser beam used, are discussed. The feasibility of the correlation
coefficient (CC) method for focal plane determination of 3-D droplets was verified. A double exposure hologram
recording system with synchronization system for time control was established, and two digital spray holograms were
obtained in a short time interval. For post-processing of reconstruction images, the two-threshold and the image
segmentation methods were used in binary image transformation. Using the CC method and some image processing
techniques applied to droplets in each double exposure image, the spatial positions of droplets used to evaluate the three
dimensional droplet velocities were easily located, which proved the feasibility of in-line digital particle holographic
technology as a good measurement tool for spray droplets.
Keyword :
Digital particle; Holography; Spray droplets; Correlation coefficient method
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