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Particle size measurement is crucial in various applications, be it sizingdroplets in inkjet printing or respiratory events, tracking particulateejection in hypersonic impacts, or detecting floating target markers in freesurface flows. Such systems are characterised by extracting quantitativeinformation like size, position, velocity and number density of the dispersedparticles, which is typically non-trivial. The existing methods like phaseDoppler or digital holography offer precise estimates at the expense ofcomplicated systems, demanding significant expertise. We present a novelvolumetric measurement approach for estimating the size and position ofdispersed spherical particles that utilises a unique 'Depth from Defocus' (DFD)technique with a single camera. The calibration free sizing enables in-situexamination of hard to measure systems, including naturally occurring phenomenalike pathogenic aerosols, pollen dispersion or raindrops. The efficacy of thetechnique is demonstrated for diverse sparse dispersions, including dots, glassbeads, spray droplets, and pollen grains. The simple optical configuration andsemi-autonomous calibration procedure make the method readily deployable andaccessible, with a scope of applicability across vast research horizons.

Depth from Defocus Technique: A Simple Calibration-Free Approach for Dispersion Size Measurement