Method, system, solid-liquid conversion time point determination method and device for crystal growth

A technology for crystal growth and determination methods, applied in crystal growth, measurement devices, post-processing devices, etc., can solve problems such as the determination accuracy is limited by experience, easy to observe failure, melt sloshing, etc., to achieve fully automated growth, solution Observe failure-prone, quality-improving effects

Inactive Publication Date: 2016-04-06
苏州恒嘉晶体材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method for determining the solid-liquid transition time point of crystal growth to solve the problems in the background art that the accuracy of determining the solid-liquid transition time point by human observation is limited by experience, resulting in melt sloshing and easy observation failures , and fully automated crystal growth can be realized

Method used

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  • Method, system, solid-liquid conversion time point determination method and device for crystal growth
  • Method, system, solid-liquid conversion time point determination method and device for crystal growth
  • Method, system, solid-liquid conversion time point determination method and device for crystal growth

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Embodiment 1

[0058] Please refer to the attached figure 2 , figure 2 The flowchart of the method for determining the solid-liquid transition time point of crystal growth provided by Embodiment 1 of the present invention is shown. The method for determining the solid-liquid transition time point of crystal growth provided in Embodiment 1 of the present invention is applicable to the heat exchange crystal growth method. The solid-liquid conversion time point refers to the time point when the solid material starts to melt or the surface of the liquid raw material starts to crystallize during the crystal growth cycle. Of course, this time point is a time point in the crystal growth cycle.

[0059] figure 2 The process shown includes:

[0060] S101. Obtain images of materials in the crucible in real time.

[0061] Step S101 is usually completed by a camera, a CCD image sensor or a video recorder. Depending on the detection accuracy, the accuracy of the corresponding acquired material i...

Embodiment 2

[0074] Please refer to the attached image 3 , image 3 The flowchart of the method for determining the solid-liquid transition time point of crystal growth provided by Embodiment 2 of the present invention is shown.

[0075] image 3 In the flow shown, determining the boundary shape features corresponding to two adjacent material images includes the following steps:

[0076] S202. Detect the gray value of each pixel of the material image.

[0077] In step S202, the gray value of each pixel is calculated by detecting the gray value of each pixel in the material image.

[0078] S203. Select pixels whose grayscale values ​​are greater than a preset grayscale value to form boundary shape features.

[0079] During the crystal growth process, the temperature in the furnace body is very high. When the material in the furnace starts to melt, the boundary of the block raw material gradually shrinks. The temperature of the block raw material itself is lower than the temperature of ...

Embodiment 3

[0083] Please refer to the attached Figure 4 , Figure 4 The flow chart of the method for determining the solid-liquid transition time point of crystal growth provided by Embodiment 3 of the present invention is shown.

[0084] Figure 4 In the flow shown, determining the boundary shape features corresponding to two adjacent material images includes the following steps:

[0085] S302. Detect the gray value of each pixel in the material image.

[0086] In step S302, the gray value of each pixel is calculated by detecting the gray value of each pixel in the material image.

[0087] S303. Calculate the difference between the gray values ​​of all two adjacent pixels.

[0088] The difference between the gray values ​​of all two adjacent pixels is calculated according to the gray value of each pixel acquired in step S302. During the process of crystal growth, the temperature in the furnace body is very high. When the materials in the furnace start to melt, the boundaries of the ...

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Abstract

The invention provides a solid-liquid conversion time point determination method for crystal growth. The method comprises the following steps: (11) acquiring images of materials in a crucible in real time; (12) determining boundary shape features corresponding to adjacent two material images; (13) computing areas, i.e., a first feature area and a second feature area of the boundary shape features of the adjacent two material images; (14) judging whether the absolute value of difference between the first feature area and the second feature area is greater than a set value or not; and (15) when the absolute value of the difference is greater than the set value, taking a shoot time point corresponding to the material image, which is shot later, of the adjacent two material images as a solid-liquid conversion time point. The invention also provides a solid-liquid conversion time point determination device for crystal growth as well as a crystal growth system and method. According to the scheme, the problem in the background art that the accuracy of determining subjects to experience, melt sloshing is caused and failed observation is easy due to the fact that the solid-liquid conversion time point is determined through artificial observation can be solved.

Description

technical field [0001] The present invention relates to the technical field of crystal growth, and more specifically, to a method and device for determining the solid-liquid conversion time point of crystal growth. The present invention also relates to a crystal growth system including the device, and a crystal using the above method growing method. Background technique [0002] There are many methods for growing crystals (such as sapphire) from bottom to top, such as heat exchange method, crucible descent method, temperature gradient method and so on. Among them, the heat exchange method has become the main method for crystal growth due to its advantages of high degree of automation, stable thermal field, long life, and low dependence on labor. [0003] Please refer to the attached figure 1 , figure 1 It is a schematic diagram of a typical crystal growth system using heat exchange method for crystal growth. figure 1 The crystal growth system shown includes a furnace bod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B35/00G01N21/84
Inventor 徐永亮廖永建汪海波
Owner 苏州恒嘉晶体材料有限公司
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