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提出了一种基于函数拟合的全息检测复合材料粘接缺陷特征提取方法,用于缺陷定量评估。包括:对干涉条纹跟踪获取条纹空间分布坐标,多项式函数拟合得到条纹曲线函数,函数求导提取表征缺陷大小特征的干涉条纹突变的起始、终止点坐标和缺陷大小定量估计。为检验其可信性,根据复合材料脱粘缺陷在激光全息检测下的典型条纹表现,构造已知参数的缺陷条纹模型,用该方法进行特征提取和缺陷大小评估。其结果与模型设计值比较,相对误差为25%,从而说明提出的新方法能较好地对脱粘缺陷进行定量评估。该方法被应用于实际激光全息检测条纹缺陷特征提取和缺陷大小评估,得到的结果与实际设计比较,其误差为0.6%。
A new feature extraction method based on function fitting for detecting the adhesive defects of composite materials was proposed for the quantitative evaluation of defects. The method includes the following steps: acquiring the coordinate of the fringe space distribution by the interference fringe tracking, fitting the fringe curve function by the polynomial function fitting, and deriving the coordinates of the starting fringe point and the quantitative estimation of the defect size of the fringe mutation spot by the function derivation. In order to test its credibility, according to the typical fringe manifestation of composite debonding defects detected by laser holography, a defect stripe model with known parameters was constructed, which was used for feature extraction and defect size assessment. The result is compared with the model design value, the relative error is 25%, which shows that the new method proposed can well evaluate the debonding defects quantitatively. This method is applied to the feature extraction and defect size estimation of the actual laser holographic striping defect. The obtained result is 0.6% compared with the actual design.