Laser Ultrasonic Depth Measurement of Surface Cracks
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摘要: 采用激光超声检测技术对不同深度的铝合金6061表面微裂纹进行了检测。通过搭建激光超声检测试验平台，得到不同缺陷深度的表面裂纹的缺陷信号，分析了缺陷信号的时域信号特征。研究表明：利用反射回波的震荡时间差可以定量评估裂纹深度，从而实现金属表面微裂纹深度的定量检测；通过检测不同深度的Q235钢的表面缺陷，证明了利用震荡时间差定量检测表征缺陷深度的正确性，研究结果具有一定的应用价值。Abstract: In this paper, the surface microcrack detection of aluminum alloy 6061 with different depths was studied by laser ultrasonic detection technology. The defect signals of surface cracks with different depths were obtained by building a laser ultrasonic testing platform. The characteristics of the defect signals in time domain were analyzed. The results show that:the crack depth can be qualitively assessed by using the time difference of reflection echo, so that the quantitative detection of micro-crack depth on metal surface can be realized; by testing the surface defects of steel Q235 at different depths, the correctness of using oscillating time difference to quantitatively detect and characterize the defect depth is proved. The research results of this paper have potential application value.
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Keywords:
- laser ultrasonic /
- surface crack /
- oscillation time difference /
- depth measurement
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