Measuring droplet size distributions from overlapping interferometric particle images

H. Bocanegra Evans, N.J. Dam, G. Bertens, D.D. van der Voort, W. van de Water

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)
270 Downloads (Pure)


Interferometric particle imaging provides a simple way to measure the probability density function (PDF) of droplet sizes from out-focus images. The optical setup is straightforward, but the interpretation of the data is a problem when particle images overlap. We propose a new way to analyze the images. The emphasis is not on a precise identification of droplets, but on obtaining a good estimate of the PDF of droplet sizes in the case of overlapping particle images. The algorithm is tested using synthetic and experimental data. We next use these methods to measure the PDF of droplet sizes produced by spinning disk aerosol generators. The mean primary droplet diameter agrees with predictions from the literature, but we find a broad distribution of satellite droplet sizes.
Original languageEnglish
Article number023709
Number of pages9
JournalReview of Scientific Instruments
Issue number2
Publication statusPublished - 2015


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