MELT SURFACE FLOW FIELD MEASUREMENT METHOD FOR ARTIFICIAL CRYSTAL GROWTH SYSTEMS AND CRYSTAL GROWTH APPARATUS UTILIZING THE METHOD

摘要

A melt surface flow field measurement method that captures flow rates at multiple tracking points and their mapping on melt surface for artificial crystal growth systems includes the following steps: (A) capture two consecutive images of the melt surface at a time interval of Δt; (B) define the significant regions in the first image as a plurality of first grid regions, then calculate centroid coordinates of the first grid regions; (C) define the regions in the second image corresponding to the significant regions in the first image as a plurality of second grid regions, then calculate centroid coordinates of the second grid regions; (D) lay the second set of centroid coordinates over the first grid regions, and calculate the distances between corresponding centroid coordinates to determine the displacement of the identified significant regions; and (E) divide the displacements by the time interval Δt to determine the flow rate and direction of each identified significant region on melt surface at their centroids—the tracking points.