Crystal line growing state detection method, apparatus and device for silicon rod

Patent metadata

Field	Value
Publication number	US-12002234-B2
Application number	US-201917256494-A
Country	US
Kind code	B2
Filing date	Nov 11, 2019
Priority date	Nov 26, 2018
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A method, apparatus and device for detecting a growth state of a crystalline line of a silicon rod, relating to the technical field of monocrystalline silicon, including in a process of constant-diameter growth of the silicon rod, acquiring a sample image of the silicon rod providing a detection area in the sample image, wherein the detection area overlaps with a crystalline-line growth line of the silicon rod generating a grayscale-value curve of the detection area, and according to the grayscale-value curve of the detection area, determining the growth state of the crystalline line of the silicon rod on the crystalline-line growth line. The method alleviates the affection on the detection of crystalline lines by the fluctuation of the diameter of the silicon rod and the unclarity of the features of the crystalline lines, thereby improving the accuracy and the efficiency of the detection on the crystalline lines.

First claim

The invention claimed is:

1. A method for detecting a growth state of a crystalline line of a silicon rod, wherein the method comprises:
in a process of constant-diameter growth of the silicon rod, acquiring a sample image of the silicon rod;
providing a detection area in the sample image, wherein the detection area overlaps with a crystalline-line growth line of the silicon rod, and in the process of the constant-diameter growth of the silicon rod, the crystalline line of the silicon rod grows along the crystalline-line growth line;
generating a grayscale-value curve of the detection area; and
according to the grayscale-value curve, determining the growth state of the crystalline line of the silicon rod on the crystalline-line growth line,
wherein the detection area comprises: a line segment perpendicular to an axial direction of the silicon rod, or a rectangular area perpendicular to an axial direction of the silicon rod, wherein a plane of the rectangular area is perpendicular to the axial direction of the silicon rod.

2. The method according to claim 1 , wherein if the detection area is the line segment perpendicular to the axial direction of the silicon rod, the step of generating the grayscale-value curve of the detection area comprises:
by starting from one end of the line segment, generating a grayscale-value curve corresponding to the line segment.

3. The method according to claim 1 , wherein if the detection area is the rectangular area perpendicular to the axial direction of the silicon rod, the step of generating the grayscale-value curve of the detection area comprises:
by starting from one end of the rectangular area, dividing the rectangular area into a plurality of identical sub-areas;
calculating an average grayscale value of each of the sub-areas; and
according to the average grayscale values of all of the sub-areas, generating a grayscale-value curve corresponding to the rectangular area.

4. The method according to claim 1 , wherein the step of, according to the grayscale-value curve, determining the growth state of the crystalline line of the silicon rod on the crystalline-line growth line comprises:
according to the grayscale-value curve, calculating a variance value of the grayscale values in the grayscale-value curve;
if the variance value of the grayscale values is greater than or equal to a variance-value threshold, determining the growth state to be a continued state; and
if the variance value of the grayscale values is less than the variance-value threshold, determining the growth state to be a line-breaking state.

5. The method according to claim 1 , wherein the step of, according to the grayscale-value curve, determining the growth state of the crystalline line of the silicon rod on the crystalline-line growth line comprises:
if the grayscale-value curve has a crystalline-line characteristic peak, determining the growth state to be a continued state; and
if the grayscale-value curve does not have the crystalline-line characteristic peak, determining the growth state to be a line-breaking state.

6. The method according to claim 1 , wherein after the step of acquiring the sample image of the silicon rod, the method further comprises:
according to a predetermined image-enhancement algorithm, performing image-enhancement processing to the sample image.

Assignees

• Longi Green Energy Technology Co Ltd

Inventors

• Guo Li
• Li Qiao
• Xu Zhanjun

Classifications

• G06T2207/30242

  Counting objects in image · CPC title

• G06T2207/20072

  Graph-based image processing · CPC title

• G06T7/001

  using an image reference approach · CPC title

• C30B29/06

  Silicon · CPC title

• C30B15/26

  using television detectors; using photo or X-ray detectors · CPC title