Frequency-wavenumber domain ultrasonic phased array total focusing method imagingdetection for delamination defect of aviation metal sheet
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摘要: 将超声相控阵频率-波数域全聚焦算法应用于304不锈钢金属薄板分层缺陷的检测中，采用两种型号的相控阵探头分别对厚度为1 mm和3 mm金属薄板的分层缺陷进行检测，比较了时域全聚焦和频率-波数域全聚焦两种算法的成像质量。结果表明：基于时域和频率-波数域的全聚焦算法均能够检测出金属薄板的分层缺陷，相对于传统时域全聚焦成像方法，频率-波数域全聚焦法成像检测具有分辨率高、伪像区域小等优点。Abstract: In this paper, the ultrasonic phased array frequency-wavenumber domain total focusing method was applied to 304 stainless steel sheet metal layered defect detection. Two kinds of models of phased array probe were used, to detect 1 mm and 3 mm thickness of sheet metal layered defect, and the conventional time domain total focusing method and frequency-wavenumber domain total focusing method imaging quality of two kinds of algorithm were compared. The research results show that total focusing method algorithms based on time domain and frequency-wavenumber domain can detect layered defects of thin metal plates. As compared with conventional time domain total focusing method imaging, the frequency-wavenumber domain total focusing method imaging detection has high resolution, smaller artifact areas and other advantages.
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