Digital holographic measurement of liquid-liquid two-phase flows

► A liquid/liquid two-phase flow is characterized by in-line Digital Holography. ► A new model outclassing the opaque disk is used for millimetric transparent drops. ► A very sharp autofocus function selected from a literature review. ► 3D positioning is verified on a calibrated setup by comparison with another method. ► Droplets path and diameters are assessed.