Mr. Y. Qing Wei Profile

Y. Qing Wei

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Proceedings Article | 24 November 2009 Paper

Study on removal of phase lines in welding pool surface shape sensing

Yiqing Wei, Nansheng Liu, Xian Hu, Xiaopu Ai, Sheng Wei, Xiaorui Liu

Proceedings Volume 7513, 751308 (2009) https://doi.org/10.1117/12.838348

KEYWORDS: Fringe analysis, Raster graphics, Charge-coupled devices, Error analysis, Image processing, Photography, Sensing systems, Physics, Sensors, Structured light

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In recent years, arc welding pool surface shape sensing becomes a hot spot in the field of welding automation. In order to restore the pool surface shape, we first need to photograph the pool surface, and then extract useful information from the acquired images. In arc welding surface shape sensing system based on structured light projection, the raster images obtained by charge-coupled device (CCD) are seriously affected by strong arc and spatter, etc. resulting in errors of phase unwrapping, and thus seriously affecting the surface shape recovery. To address phase lines of unwrapping errors, this paper presents a two-neighborhood method. First we analyzed the characteristics of phase lines in the phase diagram, then by comparison of phase diagrams or phase difference diagrams processed before and after, the effectiveness of two-neighborhood method was confirmed, finally this method was applied to the actual pool phase diagram processing, experimental results also confirmed this two-neighborhood method is feasible in removal of phase lines.

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