Digital holographic systems for particulate processes

Abstract

List of Figures 2.1 Limitations of photographic imaging technique. (a) out of focused particle on a photographic image plane; (b) aggregated particles on the image plane. 12 2.2 Geometry of DIH 14 2.3 Schematic representation showing step-wise implementation of DH for micro-objects analysis. 2.4 Diffraction pattern of a particle onto the CCD array. 2.5 Maximum spatial frequency resolved by a CCD array. 2.6 Particle with diverging illumination. 3.1 Materials used for particle concentration and turbidity effects. (a) for concentration effect; (b) for turbidity effect. 3.2 Optical setup of the digital inline holographic microscopy. 3.3 Schematic for the calculation of sample volume imaged onto the camera. 3.4 Effect of particle concentration on detection efficiency. 3.5 Reconstructed images for 10 mm depth. (a) 0.01 v/v% particle concentration; (b) 0.05 v/v% particle concentration showing particle-particle interaction; (c) 0.05 v/v% particle concentration showing size reduction due to the noise (particle outlines at both lower and higher concentrations are shown in the inset for comparison). The green region is the area identified as the particle by the image processing algorithm. 3.6 Holograms and reconstructed images at 0.01 v/v% particle concentration. (a) hologram for 5 mm depth; (b) hologram for 10 mm depth; (c) reconstructed image at 25.55 mm for the hologram shown at (a); (d) reconstructed image at 29.95 mm for the hologram shown at (b). 30 3.7 PSDs and particle sizes at different concentrations. (a) PSDs for 10 mm depth; (b) Errorbar plot of the particle sizes for 10 mm depth; (c) PSDs for 5 mm depth; (d) Errorbar plot of the particle sizes for 5 mm depth. Errorbar plots are drawn based on the means and standard deviations of the distributions.