Abstract
This paper presents a technique for the measurement of size and position for the particles distributed in three-dimensional space, based on digital holography. In this technique, the phase distribution relative to background phase is computed in the measuring volume behind an observed digital hologram to detect the position and diameter of each small particle. The present technique is robust to the holograms with higher number density of particles as compared with a conventional technique using the information of reconstructed light intensity. The measurement accuracy of the present method is evaluated in numerical simulations and the influence of some measuring parameters on it is shown for artificial particle models.
