Intelligent rutile single crystal growth control method based on computer vision feedback

Abstract

The invention belongs to the field of new materials, and particularly relates to an intelligent rutile single crystal growth control method based on computer vision feedback, which comprises the following steps: acquiring image information by using a high-definition video acquisition system, and preprocessing an image by using the high-definition video acquisition system; using OPENCV to analyze image features by a computer to realize image segmentation and feature point positioning; performing crystal growth current real-time form analysis on crystal growth state characteristics of the processed image by using a convolutional neural network; comparing the analysis result with an edge coordinate curve of a healthy crystal growth form obtained by machine learning, and judging whether the crystal form is normal or not; and if yes, continuing to use the original given function curve to carry out growth control, and if not, adjusting the position of the combustion table and the feeding parameters through self-service adjustment, and implementing feedback images. Various parameters of crystal growth can be accurately controlled, and temperature distribution, composition distribution andmechanical distribution in the growth chamber are guaranteed.

Description

technical field [0001] The invention belongs to the field of new materials, in particular to an intelligent control method for rutile single crystal growth based on computer vision feedback. Background technique [0002] Because of its high birefringence and chemical stability, rutile single crystal has irreplaceable advantages in the preparation of optical isolators, optical circulators, polarizers and other devices. Single crystals of high temperature oxides, such as rutile, are traditionally grown using conventional flame fusion crystal growth furnaces. [0003] High-temperature oxide single crystals have special physical and chemical properties and play an important role in scientific research and modern social life. For example, rutile (TiO2) single crystal has large birefringence and high refractive index, and is used in spectral prisms and polarizing devices, such as optical isolators, optical circulators, and beam splitters. The above-mentioned devices currently us...

AI Technical Summary

Problems solved by technology

At present, the traditional crystal growth furnace is used. Since many growth process parameters cannot be accurately controlled, it is only possible to manually observe the crystal growth rate, growth shape, temperature distribution and composition distribution in the entire growth chamber, and then manually adjust the control parameters. The adjustment is mainly based on the experience of the operator, and no strict data relationship has been formed, resulting in a low success rate of crystal growth, and this will lead to structural integrity problems in the grown crystal, such as high dislocation density, large stress, and unstable Evenly etc.

During the crystal growth process, it is necessary to observe the crystal shape in real time and adjust the given speed of raw materials, so that each equipment operator operates at most two crystal growth furnaces, and operates the equipment while observing, and is often in a hurry, resulting in "flowing" in the early stage of crystal growth. "Phenomenon, which affects the success rate of crystal growth and increases the labor intensity of controlling crystal growth

[0004] At present, the rutile crystal market is monopolized by Japanese companies, and the success rate of crystal growth is not high, about 30%, and it cannot be mass-produced, which greatly limits the application of rutile crystals

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