• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2004, Vol. 40 ›› Issue (7): 180-185.

• 论文 • 上一篇    下一篇

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大功率Nd：YAG激光焊接过程同轴视觉传感

秦国梁;齐秀滨;杨永波;王旭友;林尚扬   

  1. 哈尔滨工业大学现代焊接生产技术国家重点实验室;机械科学研究院哈尔滨焊接研究所
  • 发布日期:2004-07-15

COAXIAL VISUAL SENSING TECHNOLOGY IN Nd：YAG LASER WELDING WITH HIGH POWER

Qin Guoliang;Qi Xiubin;Yang Yongbo;Wang Xuyou;Lin Shangyang   

  1. State Key Lab of Advanced Welding Production Technology, Harbin Institute of Technology Harbin Research Institute of Welding, China Academy of Machinery Science and Technology
  • Published:2004-07-15

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摘要： 利用半透半反分光镜片成功地解决了激光焊接同轴视觉传感技术中同轴成像光信号分离提取难的问题，建立了大功率Nd：YAG激光焊接过程同轴视觉传感系统。针对无辅助照明光的激光焊接同轴视觉图像成像信号的特点，设计了相应的中值滤波和同态滤波来消除图像的低频噪声和增强图像，并基于图像阈值分割技术搜索、检测出了熔池和小孔图像边缘的位置。最后，利用Hough变换对图像边缘进行曲线拟合得到熔池和小孔边缘曲线的拟合方程并从拟合结果中求得熔池和小孔的二维尺寸。

关键词: 大功率Nd：YAG激光焊接, 曲线拟合, 视觉传感, 同轴, 图像处理

Abstract: A dichroitic mirror is designed to extract video signal from axis of laser beam with high power, which resolves the problem of difficultly extracting coaxial video signal from laser welding pool. The mirror is set in laser path whose inclination angle is 45°with axis of laser beam. The coaxial visual sensing system to monitor high power Nd：YAG laser welding process is established based on this light path of extracting video signal. The median filter and homomorphic filter are designed to remove low frequent noise between rows and to enhance images based on analyzing the characteristics of imaging signal. Edges of welding pool and keyhole are extracted based on image segmentation with threshold. In order to get precise shape parameters of welding pool and keyhole, edges are fitted by Hough transform and the sizes of welding pool and keyhole are obtained from the fitted results.

Key words: Coaxial, Curve fitting, Image processing, Nd：YAG laser welding with high power, Visual sensing

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