A laser speckle technique is proposed for the study of diffusion in transparent liquid mixtures. The diffusion constants may be deduced by a simple manipulation of the speckle patterns recorded during the diffusion process. The proposed method, checked with the LiBr-water system, gives reasonable agreement with existing data
In this paper the application of DSPI to diffusion evaluation in liquid binary mixtures is discussed. The interdisciplinary nature of the proposed technique is outlined by emphasizing its connections with electronics, digital image processing and numerical analysis. An extensive simulation of the procedure and preliminary experimental results are presented.
In this work we use the unusual behaviour of a light beam in a diffusion cell as an experimental introduction for university students of physics and engineering to the optical - mechanical analogy. We have found that the lecture demonstration is a key element in the development of the presentation and subsequent use of the analogy.
Riassunto. In questo lavoro si utilizza l'inusuale comportamento di un fascio luminoso in una cella di diffusione come introduzione sperimentale, per studenti di fisica e di ingegneria, all'analogia tra il comportamento di una particella materiale ed un fascio luminoso (Analogia di Hamilton). La dimostrazione didattica rappresenta un elemento chiave nello sviluppo della presentazione e del successivo utilizzo dell'analogia.
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