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Proceedings Paper

Beam deflection apparatus with high resolution for monitoring TGS crystal growth
Author(s): Sergio Musazzi; A. Affinito; Christian Stenzel; G. Fabritius
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Paper Abstract

A beam deflection apparatus with a high resolution has been developed which allows monitoring of temperature and concentration gradients in the region around a TGS (triglycine sulphate) crystal growing from an aqueous solution. The developed optical setup consists of two measuring arms that allow inspection of the test region along two perpendicular directions. With a lateral position sensing device the deflection of a mildly focused laser beam traversing the medium to be tested have been measured along one inspection axis, while a 2D analysis of the test region is performed in the orthogonal direction by means of a properly focused light blade and a CCD camera. Experimental verification of the technique has been performed utilizing TGS crystal growth by means of the 'cooled sting' method. The experiment takes place in a double-wall glass cell, the temperature of the TGS crystal can be adjusted independently from the solution temperature. Systematic measurements have been performed which allow to characterize concentration gradients and thermal convection in the vicinity of the crystal. Analysis of experimental results shows the high sensitivity of this method. This technique is well suited as a diagnostic tool for monitoring and controlling crystal growth experiments in microgravity.

Paper Details

Date Published: 12 July 1996
PDF: 11 pages
Proc. SPIE 2809, Space Processing of Materials, (12 July 1996); doi: 10.1117/12.244341
Show Author Affiliations
Sergio Musazzi, CISE (Italy)
A. Affinito, Univ. of Milan (Italy)
Christian Stenzel, DASA/Dornier (Germany)
G. Fabritius, DASA/Dornier (Germany)

Published in SPIE Proceedings Vol. 2809:
Space Processing of Materials
Narayanan Ramachandran, Editor(s)

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