Automated Vision System for Crystal Growth Monitoring
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Solution Overview
Problem
Existing crystal growth apparatuses face challenges in accurately determining when feedstock is fully melted and when ingot growth is complete, leading to impurities and damage due to reliance on manual and inconsistent temperature readings.
Innovation Solution
An automated vision system is positioned above the crucible to monitor the surface of the feedstock melt, distinguishing between solid and liquid phases, and sending signals to control heating and solidification processes to ensure complete melting and growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual temperature readings and visual inspection are used to determine melting completion and growth completion, then the operator can monitor the process, but the identification is unreliable and inconsistent leading to impurities and thermal damage
Solution Approach 1:
The patent replaces manual visual inspection and temperature reading with an automated vision system that uses optical imaging to detect the solid-liquid interface. The vision system captures images through the furnace viewport and automatically determines melting completion and growth completion, eliminating the unreliability of manual methods and preventing the harmful effects of impurities and thermal damage.
Solution Approach 2:
The patent introduces an automated vision system as an intermediary between the furnace process and the operator. This intermediary automatically monitors the melt surface and solidification process, providing reliable detection of phase boundaries without requiring direct operator observation, thereby ensuring consistent and accurate process control.
2Quantity of substance
If the feedstock remains at high melting temperature for excessive time, then complete melting is achieved, but contaminants such as carbon and oxygen increase producing impurities
Solution Approach 1:
The patent implements a feedback control system where the vision system continuously monitors the melt surface and automatically detects when all solid feedstock has melted. This feedback signal triggers immediate termination of heating, ensuring complete melting while preventing excessive heating that would introduce contaminants and maintain optimal material purity.
3Reliability
If automated vision system is implemented to monitor melting and growth completion, then identification reliability improves, but device complexity increases
Solution Approach 1:
The patent designs the automated vision system to perform multiple functions: detecting melting completion, monitoring solidification progress, and determining growth completion. By using a single multi-functional vision system rather than separate detection systems for each stage, the patent improves reliability while minimizing the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures precise control over the crystal growth process, reducing impurities and thermal damage by automating the detection of remaining solid feedstock and completed solidification, resulting in higher-quality crystalline materials.
Implementation Method 1
monitoring for remaining solid feedstock in the liquid feedstock melt with an automated vision system positioned above the crucible
Data Source
AI summary
Various embodiments of a method for producing a crystalline material in a crucible in a crystal growth apparatus are disclosed. The method comprises, in part, the step of monitoring for remaining solid feedstock in a liquid feedstock melt with an automated vision system positioned above the crucible. Alternatively, or in addition, the method comprises the step of monitoring for solidified crystalline material in a partially solidified melt with the automated vision system. A crystal growth apparatus comprising the automated vision system is also disclosed.