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Proceedings Paper

Measurement of mass diffusion coefficients by digital moiré
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Paper Abstract

In order to measure small diffusion coefficients of miscible fluids, in this paper we propose an improved version of digital projection moiré. The system uses a simple and flexible fringe generator realized by means of a video projector with a modification of projection optic. The fringe patterns are projected on the bottom of a ground glass plate. The phase object (diffusion cell) is placed in front of the ground glass (in other words, in front of the fringe pattern), which is imaged by a digital video camera. Grating patterns, during the evolution of diffusion phenomena, are captured by a CCD camera and stored in a computer at different times. With the aid of signal demodulating techniques, the images are processed to obtain the diffusion coefficients. The theoretical aspects of the method are presented and the relationship between the fringe shift and the diffusion coefficient is derived. Furthermore, we report some experiments conducted for demonstrating the usefulness of the system.

Paper Details

Date Published: 11 October 2005
PDF: 8 pages
Proc. SPIE 5958, Lasers and Applications, 59582Q (11 October 2005); doi: 10.1117/12.623136
Show Author Affiliations
Giuseppe Schirripa Spagnolo, Univ. degli Studi Roma Tre (Italy)
Carla Simonetti, Univ. degli Studi Roma Tre (Italy)
Lorenzo Cozzella, Univ. degli Studi Roma Tre (Italy)

Published in SPIE Proceedings Vol. 5958:
Lasers and Applications
Krzysztof M. Abramski; Antonio Lapucci; Edward F. Plinski, Editor(s)

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