Abstract: A three-dimensional real-time observation instrument was developed, which was con- sisted of crystal part, optic observation part, and result analysis part. The crystal growth and flow movement was observed by the two-eye observation method. A new growth furnace and crucible, being suitable for Bridgman method crystal growth, was developed. The solidliquid interface of NaNO₃ was visualized. At last the image visualized was synthesized into three-dimensional image by a processing software.

Key words: melt crystal growth, three-dimensional observation, image processing