Experiments in Fluids

, Volume 47, Issue 1, pp 171–182

Droplet imaging velocimeter and sizer: a two-dimensional technique to measure droplet size

Research Article

DOI: 10.1007/s00348-009-0645-2

Cite this article as:
Hess, C.F. & L’Esperance, D. Exp Fluids (2009) 47: 171. doi:10.1007/s00348-009-0645-2


This paper discusses the droplet imaging velocimeter and sizer (DIVAS), a two-dimensional technique to measure droplet size from very small droplets (a few microns) to very large drops (millimeters), as well as droplet velocity and concentration. DIVAS uses a particle imaging velocimetry (PIV) configuration; that is, pulsed lasers illuminate the droplets in the measurement plane and CCD cameras collect the off-axis scattered light, thus yielding a small measurement volume and correspondingly a high number density measurement capability. DIVAS is based on glare point imaging as described by van de Hulst and Wang (Appl Opt 30(33):4755–4763, 1991). By measuring the separation of cross-polarized glare points, DIVAS is capable of measuring droplet size down to a few microns with sub-pixel resolution. The measurement of large drops from the separation of glare points is straightforward. However, the paper discusses that large drops are often non-spherical and more advanced signal processing is required to retrieve their size. Both analytical studies and experiments are presented to demonstrate the feasibility of the technique.

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.MetroLaser, IncIrvineUSA