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Proceedings Paper

On-line digital holographic measurement of size and shape of microparticles for crystallization processes
Author(s): Taslima Khanam; Emmanouil Darakis; Arvind Rajendran; Vinay Kariwala; Anand K. Asundi; Thomas J. Naughton
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Paper Abstract

Crystallization is a widely used chemical process that finds applications in pharmaceutical industries. In an industrial crystallization process, it is not only important to produce pure crystals but also to control the shape and size of the crystals, as they affect the efficiency of downstream processes and the dissolution property of the drug. The effectiveness of control algorithms depend on the availability of on-line, real-time information about these critical properties. In this paper, we investigate the use of lens-less in-line digital holographic microscopy for size and shape measurements for crystallization processes. For this purpose, we use non-crystalline spherical microparticles and carbon fibers with known sizes present in a liquid suspension as test systems. We propose an algorithm to extract size and shape information for a population of microparticles from the experimentally recorded digital holograms. The measurements obtained from the proposed method show good agreement with the corresponding known size and shape of the particles.

Paper Details

Date Published: 3 October 2008
PDF: 10 pages
Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71551K (3 October 2008); doi: 10.1117/12.814557
Show Author Affiliations
Taslima Khanam, Nanyang Technological Univ. (Singapore)
Emmanouil Darakis, National Univ. of Ireland, Maynooth (Ireland)
Nanyang Technological Univ. (Singapore)
Arvind Rajendran, Nanyang Technological Univ. (Singapore)
Vinay Kariwala, Nanyang Technological Univ. (Singapore)
Anand K. Asundi, Nanyang Technological Univ. (Singapore)
Thomas J. Naughton, National Univ. of Ireland, Maynooth (Ireland)
Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 7155:
Ninth International Symposium on Laser Metrology
Chenggen Quan; Anand Asundi, Editor(s)

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