基于激光超声的金属增材制造层间缺陷埋藏深度测量方法

本发明提供基于激光超声的金属增材制造层间缺陷埋藏深度测量方法，包括：步骤1、对样品表面进行二维扫描，获得超声表面波时域A扫描信号；步骤2、从扫描信号的二维彩色图像中找到有颜色差异的区域作为缺陷影像区域，提取缺陷A扫描；步骤3、对提取的A扫描进行小波变换得到小波时频图像；步骤4、提取小波时频图像中A0模态兰姆波所对应的区域，读取小波系数最大时所对应的时刻和频率；步骤5、计算材料的表面波声速CR；步骤6、根据CR计算得到激光超声系统的延时T0；步骤7、计算缺陷扰动表面波转换得到的A0模态兰姆波的相速度；步骤8、得到A0模态兰姆波的相速度频散关系曲线；步骤9、根据声速和关系曲线，得到缺陷的埋藏深度。...

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Format:	Patent
Sprache:	chi
Schlagworte:	ADDITIVE MANUFACTURING TECHNOLOGY ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PERFORMING OPERATIONS PHYSICS TESTING TRANSPORTING
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Zusammenfassung:	本发明提供基于激光超声的金属增材制造层间缺陷埋藏深度测量方法，包括：步骤1、对样品表面进行二维扫描，获得超声表面波时域A扫描信号；步骤2、从扫描信号的二维彩色图像中找到有颜色差异的区域作为缺陷影像区域，提取缺陷A扫描；步骤3、对提取的A扫描进行小波变换得到小波时频图像；步骤4、提取小波时频图像中A0模态兰姆波所对应的区域，读取小波系数最大时所对应的时刻和频率；步骤5、计算材料的表面波声速CR；步骤6、根据CR计算得到激光超声系统的延时T0；步骤7、计算缺陷扰动表面波转换得到的A0模态兰姆波的相速度；步骤8、得到A0模态兰姆波的相速度频散关系曲线；步骤9、根据声速和关系曲线，得到缺陷的埋藏深度。 The invention provides a method for measuring the burial depth of a metal additive manufacturing interlayer defect based on laser ultrasound, which comprises the following steps of: 1, carrying out two-dimensional scanning on the surface of a sample to obtain an ultrasonic surface wave time domain A scanning signal; step 2, finding an area with color difference from the two-dimensional color image of the scanning signal as a defect image area, and extracting defect A scanning; step 3, performing wavelet transform on the extracted A scan to obtain a wavelet time-frequency image; 4, extracting an area corresponding to the A0 modal Lamb wave in the wavelet time-frequency image, and reading a moment and a frequency co