Defect detection and color sorting method of photovoltaic solar crystalline silicon cell, and system thereof
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A technology for photovoltaic solar energy and crystalline silicon cells, which is used in optical testing for flaws/defects, optical instrument testing, and testing of machinery/structural components. effect of speed
Pending Publication Date: 2018-12-25
SOUTH CHINA UNIV OF TECH
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Use the camera to collect images, and judge whether there are defects such as hidden cracks and broken grids according to the characteristics of the gray scale value at the defect. Since electroluminescence is a contact measurement, it is easy to cause damage to the battery
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Embodiment 1
[0054] Such as figure 1 As shown, the defect detection and color sorting method of photovoltaic solar crystalline silicon cells includes the following steps:
[0055] S1. Collect the silicon wafer image and perform preprocessing, specifically collect the gray calibration plate image of the silicon wafer under red, green and blue light sources, perform light compensation on the image, and then perform color calibration on the light compensated image; Specifically include the following steps:
[0056] S11. Setting the luminous intensity of the red, green and blue light sources by controlling the light source controller;
[0057] S12. Use an industrial camera to separately collect images of calibration plates whose colors are gray under red, green, and blue light sources;
[0058] S13. Perform illumination compensation on the calibration plate image by collecting black and white images of three color light sources;
[0059] S14. Perform color calibration: collect images after ...
Embodiment 2
[0075] Such as figure 2As shown, the defect detection and color sorting system of photovoltaic solar crystalline silicon cells using the method described in Example 1, the defect detection and color sorting system includes: industrial camera 1, sealed box 2, LED light source 3, red backlight Board 4, transmission mechanism unit 5, light source controller 6, image acquisition card 7, industrial computer 8, host computer display 9, silicon chip to be tested, platform cabinet 10; the transmission mechanism unit 5 includes a bracket and a Conveyor belt; the industrial computer 8 includes a CPU, a display, and a memory;
[0076] The industrial computer 8 is connected to the light source controller 6, the image acquisition card 7, and the host computer display 9; the LED light source is a red, green and blue tricolor light source, and the light source controller 6 is connected to the LED light source 3 for controlling red, green and blue light sources. three kinds of light source ...
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Abstract
The invention discloses a defect detection and color sorting method of a photovoltaic solar crystalline silicon cell. The method comprises the following steps: firstly collecting a silicon wafer image, and preprocessing the image to achieve a color calibration aim; and then performing silicon wafer positioning to obtain an interested silicon wafer region; and then performing various detections onthe silicon wafer region, wherein the detections comprise size detection, breakage detection, grid line extraction, grid line detection, main grid detection, stain detection, and color spot detection,thereby detecting a defect region on a product surface; and finally performing classification on different color shades of the silicon wafers. The invention further discloses a defect detection and color sorting system of the photovoltaic solar crystalline silicon cell. The Defect detection and color sorting method of photovoltaic solar crystalline silicon cell and the system thereof are used fordetecting the front appearance defect and the front color grading produced after the photovoltaic solar crystalline silicon cell printing, the non-contact detection is realized, the detection precision is high, and the stability is good.
Description
technical field [0001] The invention relates to the technical field of photovoltaic cell detection, in particular to a defect detection and color sorting method and system for photovoltaic solar crystalline silicon cells. Background technique [0002] With the continuous development of the global economy and society, energy consumption also continues to grow accordingly. As time goes by, the scarcity of fossil energy becomes more and more obvious. In the context of the increasingly tense supply of fossil energy, the large-scale development and utilization of renewable energy has become an important part of the energy strategy of various countries in the future. Solar energy is an inexhaustible renewable energy for human beings. It has sufficient cleanliness, absolute safety, relative extensiveness, long life and maintenance-free, resource adequacy and potential economy. It has an important position in the long-term energy strategy. After the 1970s, domestic solar power ge...
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