Full volume digital holography for the detection of small particles distributed in 3D space

Abstract

A new digital holographic method for the detection of small particles distributed in 3D space has been developed in this paper. The method is called full volume digital holography because the light intensity of real images is computed all over the 3D region behind a hologram. The detection of particle positions is carried out by searching some local minimums or some dark regions with high contrast in the computed light intensity distribution. The performance tests are done in numerical simulation and in experiment, and the test results show that the RMS error is about 3mm for the range from 200mm to 300mm for the particle size of 100μm.