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Crystal growth interface electrical signal acquisition system

A technology of crystal growth and acquisition system, which is applied in crystal growth, single crystal growth, chemical instruments and methods, etc. It can solve the problems of low equipment sampling rate, high mismatch probability and mismatch frequency, and influence, so as to improve accuracy and stability, the effect of eliminating common mode interference

Active Publication Date: 2018-08-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the defects of low equipment sampling rate (the limit is 0.05Hz) and poor stability. Since the electrical signal must be drawn from the metal seed rod and transmitted through the electrical slip ring, in the rotating seed rod, the fixing of the slip ring The end (fixed on the furnace body) will affect the rotating end (fixed on the seed rod)
For example, the eccentric rotation of the seed rod caused by machining accuracy, high temperature working environment, air convection disturbance and other factors will cause a "mismatch" between the fixed end and the rotating end of the slip ring, and the mismatch probability and frequency are extremely high. High, this frequent mismatch not only seriously detracts from the working life of the electrical slip ring, but also causes the load cell to fail completely

Method used

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  • Crystal growth interface electrical signal acquisition system
  • Crystal growth interface electrical signal acquisition system
  • Crystal growth interface electrical signal acquisition system

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Embodiment 1

[0023] This embodiment provides a crystal growth interface electrical signal acquisition system, please refer to figure 1 , the electrical signal acquisition system 1 includes a crucible 10, a seed rod 20, a crystal transfer mechanism 30 and an electrical signal acquisition unit 40; the crystal transfer mechanism 30 is insulated from an external furnace body, and includes a crystal transfer rod 31, a shaft coupling device 32, biaxial motor 33 and electrical slip ring 34; the crystal rotating rod 31 is a hollow structure with a conductive core 311 inside; the lower end of the coupling 32 is connected to the conductive core 311; the biaxial motor 32 Including a motor bracket, a motor main shaft and a motor sub-shaft, the motor main shaft is connected to the upper end of the shaft coupling 32; the fixed end of the electrical slip ring 33 is fixed on the motor bracket, and the free end is electrically connected to the motor sub-shaft; Both ends of the electrical signal acquisition...

Embodiment 2

[0033] In this embodiment, the electrical signal acquisition system of Embodiment 1 is used to collect interface phase electrical signals, and the convective fluctuations of the melt at the crystal growth interface are obtained through signal processing.

[0034] Specifically, when the crystal enters the equal-diameter stage, the host computer starts to record and analyze the interface phase electric signal (GEMF) collected by the microvoltmeter, such as figure 2 As shown, it can be clearly observed that the original electrical signal contains multiple different periodic fluctuations, in which the long-period signal represents the melt convection fluctuation at the growth interface, and the short-period signal represents the crystal rotation temperature fluctuation at the growth interface. After Fourier processing, the frequency-energy spectrum (such as figure 2 As shown in the inset), two characteristic peaks can be clearly observed, in which the peak consistent with the cr...

Embodiment 3

[0039] In this embodiment, the electrical signal acquisition system of Embodiment 1 is used to collect interface phase electrical signals, and the temperature fluctuation of the crystal rotation path at the crystal growth interface is obtained through signal processing.

[0040] Specifically, when the crystal enters the equal-diameter stage, the host computer starts to record and analyze the interface phase electric signal (GEMF) collected by the microvoltmeter, such as Figure 5 As shown, it can be clearly observed that the original electrical signal contains multiple different periodic fluctuations, in which the long-period signal represents the melt convection fluctuation at the growth interface, and the short-period signal represents the crystal rotation temperature fluctuation at the growth interface. After Fourier processing, the frequency-energy spectrum (such as Figure 5 As shown in the inset), two characteristic peaks can be clearly observed, among which the peak con...

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Abstract

The invention relates to a crystal growth interface electrical signal acquisition system which comprises a crucible, a seed rod, a crystal rotation mechanism and an electrical signal acquisition unit;the crystal rotation mechanism is isolated with an outside furnace body and comprises a crystal rotation rod, a coulpler, a double-shaft motor and an electrical slip ring; the crystal rotation rod iselectrically connected with the seed rod and in a hollow structure, and a conductive core is arranged in the crystal rotation rod; the lower end of the coupler is connected with the conductive core;the double-shaft motor comprises a motor bracket, a motor main shaft and a motor auxiliary shaft, and the motor main shaft is connected with the upper end of the coupler; the fixed end of the electrical slip ring is fixed on the motor bracket, and the free end of the electrical slip ring is electrically connected with the motor auxiliary shaft; the two ends of the electrical signal acquisition unit are electrically connected with the crucible and the fixed end of the electrical slip ring respectively. According to the crystal growth interface electrical signal acquisition system, high-speed acquisition and stable transmission of interface electrical signals can be realized.

Description

technical field [0001] The invention relates to the field of crystal growth, in particular to a crystal growth interface electrical signal collection system. Background technique [0002] With the development of science and technology, artificial crystals have become the pillar materials in many fields such as industry, communication, medical treatment and military affairs. The pulling method is the most widely used growth method in the artificial lens industry, which can produce the most types of materials and produce the best crystal quality. The pulling method is a method of pulling and growing high-quality single crystals from the melt. The basic principle is: heat and melt the raw materials constituting the crystals in a crucible, connect the seed crystals on the surface of the melt, and pull the melt. Under certain conditions, the seed crystal and the melt are continuously arranged in regular arrangement of atoms or molecules on the interface, and gradually solidified...

Claims

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Application Information

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IPC IPC(8): C30B15/22
CPCC30B15/22
Inventor 朱允中王彪刘洋
Owner SUN YAT SEN UNIV
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