Crack defect detection method of EL test of polycrystalline silicon solar cell

Abstract

The invention discloses a crack defect detection method of an EL test of a polycrystalline silicon solar cell. The detection method is applicable to industrial production solar cell sites. The detection method comprises the steps that collected images are preprocessed, global threshold segmentation and opening operation and closing operation of morphology are conducted to suppress interference ofa non-processing area; then median filtering and guide filtering are conducted to remove image noise; a probe area is extracted through threshold differentiation and feature extraction, the probe areaand an area formed after threshold segmentation are subjected to complementary operation, the probe area is eliminated, and the area to be detected is remained; the smoothed images are subjected to Fourier transformation; the probe area and the area subjected to Fourier transformation are eliminated, intersection is conducted to obtain the area to be detected, lines of the area to be detected areextracted, and then whether or not the lines are cracks is judged according to the attribute of the lines. The crack defect detection method achieves non-contact detection, improves the detection quality and efficiency, effectively lowers the debris rate of the detection process, and can effectively achieve on-line automation of detection.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cell detection, and mainly relates to a method for detecting crack defects in EL testing of polycrystalline silicon solar cells. Background technique [0002] With the development of our country's economy, the consumption and demand of resources continue to grow, and now our country's economy is facing a critical moment of economic transformation and upgrading, and the energy problem has become another major problem hindering the development of our country's national economy. As a new renewable clean energy, solar energy has become the fastest-growing and most dynamic research field in recent years because of its good availability. Polycrystalline silicon solar cells are widely used in photovoltaic power generation. The production process of the photovoltaic industry is complex, and there are often color differences or the produced cells will have defects such as broken grids, cracks, low ef...

AI Technical Summary

Problems solved by technology

[0003] At this stage, the domestic mainly relies on artificial naked eyes to identify these defects, which is greatly affected by subjectivity, and will increase the cost of enterprises and affect the efficiency of production

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