DBPapers
DOI: 10.5593/sgem2017H/63/S24.001

AN APPROACH TO VISUALIZING THE PROCESS OF SEEDING IN THE PRODUCTION OF SAPPHIRE SINGLE CRYSTALS BY THE METHOD OF KYROPOULOS

A. Belousov, A. Grebenik, Y. Koshlich, M. Panchenko
Thursday 23 November 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgemviennagreen.org, SGEM2017 Vienna GREEN Conference Proceedings, ISBN 978-619-7408-29-4 / ISSN 1314-2704, 27 - 29 November, 2017, Vol. 17, Issue 63, 3-9 pp; DOI: 10.5593/sgem2017H/63/S24.001

ABSTRACT

The paper considers the problems that arise in the process of seeding in the production of sapphire single crystals by the method of Kyropoulos. This stage is the most important in the entire technological process, but at the same time the least automated. An approach is proposed for visualization of this stage, using technical vision. It is based on the processing of images received from the ip-camera. To observe the dynamics of growth and the crystallization front at the stage of seeding, we reviewed different algorithms for contours recognition and finally propose an approach for detecting contours of a growing crystal. This approach suppose some preliminary image processing and then using a “Snake” algorithm to detect changing of growing crystal shape in real time.

Keywords: the method of Kyropoulos, contours of a growing crystal, automation, Canny algorithm, Snakes, active contour models