激光焊OCT熔深测量去噪及数据拟合方法研究  

Study of OCT weld depth curve fitting method for laser keyhole welding

作　　者：黄贻蔚 高向东[1] 李来明 马波 张艳喜[1] HUANG Yiwei;GAO Xiangdong;LI Laiming;MA Bo;ZHANG Yanxi(Guangdong Provincial Welding Engineering Technology Research Center,School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院广东省焊接工程技术研究中心,广州510006

出　　处：《激光技术》2024年第4期590-596,共7页Laser Technology

基　　金：国家自然科学基金资助项目(52275317);广东省自然科学基金资助项目(2023A1515012172);广州市科技计划资助项目(2023B03J1326)。

摘　　要：为了解决激光焊接熔深在线检测及光学相干光层析成像(OCT)熔深检测信号噪声多的问题,采用了一种百分位滤波加移动平均算法的熔深曲线拟合方法。通过光学相干光层析成像系统对304不锈钢匙孔焊过程进行了熔深在线检测,在使用百分位滤波从原始散点数据中提取出百分位熔深曲线过程中,发现该方法提取的百分位熔深曲线存在尖峰干扰噪声,通过移动平均算法对百分位熔深曲线进行低通滤波处理,最终从原始散点数据中提取拟合出OCT熔深测量曲线。结果表明,将OCT熔深测量曲线与焊缝纵抛面的实际熔深曲线进行对比,该方法获取OCT熔深测量曲线的测量精度最大提升了15%。该方法能从OCT原始散点数据中有效提取拟合出更为准确的OCT熔深测量曲线。In order to solve the online detection of laser welding depth of fusion and to solve the problem of optical coherence tomography(OCT)depth of fusion detection signal noise,a percentile filtering plus moving average algorithm was used to fit the weld depth curve.The weld depth of 304 stainless steel keyhole welding process was detected online by optical coherence photomicrographic imaging system,in the process of extracting the percentile depth curves from the original scatter data using percentile filtering;it was found that there were spikes interfering noises in the percentile depth melting curves extracted by this method,and the percentile depth curves were processed by low-pass filtering through the moving average algorithm,and the OCT weld depth curves were finally extracted and fitted from the original scatter data.The results show that,comparing the OCT weld depth curve with the actual weld depth curve on the longitudinal surface of the weld,the measurement accuracy of the OCT depth of fusion curve obtained by this method has been improved by 15%at most.The method is effective in extracting and fitting more accurate OCT weld depth curves from the original scatter data.

关 键 词：激光技术 熔深测量 光学相干光层析成像 百分位滤波 移动平均 

分 类 号：TN249[电子电信—物理电子学] V557[航空宇航科学与技术—人机与环境工程]