低频相控阵超声检测用于船用复合材料缺陷定量分析研究

研究了低频相控阵超声检测技术用于船用复合材料缺陷定量分析的问题。首先针对典型船用复合材料的相控阵聚焦声场进行分析,包括典型材料声速对小缺陷检出能力的影响、不同频率和合成孔径对近场长度的影响以及不同聚焦深度的声场仿真,提出不同厚度典型船用复合材料的相控阵超声频率和合成孔径推荐原则。为了验证该原则的准确性,通过实测不同深度的Φ3 mm的小缺陷,运用TCG校准的方式对TCG曲线的线性和小缺陷的检测效果进行验证。实现了对典型船用复合材料近表面和内部缺陷的定量分析,达到了较好的检测效果。

Research on Low-frequency Phased Ultrasonic Detection Technology for Quantitative Analysis of Detects in Ship Composite Material

The low-frequency phased ultrasonic detection technology used for quantitative analysis of detects in ship composite material is studied. First, the phased array focused sound field of typical ship composites is studied, including the influence of sound speed on small defect detection ability, the influence of frequency and synthetic aperture on near-field length, and the simulation analysis of sound field with different focus depths. Second, the recommendation principle of ultrasonic frequency and synthetic aperture for typical ship composites with different thickness are proposed. To verify the accuracy of the principle, the Φ3 mm defects are actually detected, and the TCG curve is used to verify the detection effect. The quantitative analysis for the near-surface and internal defects of the typical ship materials is realized, and the recommendation principle turns out to be effective.