FIELD: mono-crystals production processes, possibly high-temperature growing of mono-crystals out of melts in apparatuses for horizontal oriented crystallization.
SUBSTANCE: crystallization front position is registered according to changes of contrasts of brightness of melt-crystal system heat irradiation passing through shaper of real image of said system surface onto working plane of differential photodetector at imparting vibration to said image. It is realized by means of unit for receiving optical modulated irradiation. Said unit includes successively mounted with possibility of sensing heat irradiation out of volume of melt-crystal system vibrating lens and differential photodetector arranged in plane optically coincided with plane arranged near surface of melt-crystal system.
EFFECT: possibility for reliable accurate detection of crystallization front, simplified design of apparatus for performing the method.
21 cl, 13 dwg, 1 ex
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