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为了保障高密度聚乙烯(HDPE)管道热熔接头的焊接质量，文章提出一种基于时间反转算法与瞬时相位相干加权因子的全聚焦成像算法，该方法先采用时间反转算法对信号进行处理，再提取信号中的瞬时相位构建瞬时相位相干因子，对全聚焦成像中每个像素点的幅值进行加权。针对HDPE试样φ1 mm、φ2 mm、φ3 mm的横通孔缺陷和HDPE管道热熔接头试样φ3 mm的孔缺陷进行成像检测实验。结果表明：算法能有效抑制背景噪声和伪影，将深度距离为0～10 mm的近场噪声和伪影的幅值降低约30 dB,提高全聚焦成像分辨率，与TFM算法相比4种缺陷的平均信噪比分别提高9.6 dB、11.8 dB、4.9 dB、3.5 dB,平均阵列性能指标分别降低56%、49%、38%、48%,为相控阵超声检测HDPE管道热熔接头缺陷提供了一种有效的改进方案。
Abstract：To ensure the welding quality of hot-melt joints of high-density polyethylene(HDPE) pipe, this paper proposes a total focusing method algorithm based on the time reversal algorithm and instantaneous phase coherent weighting factor. The method first processes signals through the time reversal algorithm, then extracts the instantaneous phase from the signals to construct the instantaneous phase coherent weighting factor, and weights the amplitude of each pixel of the total focusing imaging. Imaging detection experiments are carried out on φ1 mm,φ2 mm, and φ3 mm transverse through-hole defects in HDPE test block and φ3 mm hole defects in HDPE pipe butt fusion joint specimens. The experimental results show that the proposed algorithm can effectively suppress background noise and artifacts, reduce the amplitude of near-field noise(0～10 mm depth) and artifacts by about 30 dB, improve the resolution of total focusing imaging. Compared with the TFM algorithm, the average signal-to-noise ratios of the four defects are improved by 9.6 dB, 11.8 dB, 4.9 dB, and3.5 dB, respectively, and the average array performance indicators are reduced by 56%, 49%, 38%, and48%, respectively. This provides an effective improved scheme for the ultrasonic phased array detection of defects in butt fusion joints of HDPE pipe.
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基本信息:
DOI：10.15926/j.cnki.issn1672-6871.2025.04.005
中图分类号:TQ320.674
引用信息:
[1]冯稳卓,王强,王涛等.HDPE管道热熔管接头缺陷的全聚焦优化成像[J].河南科技大学学报(自然科学版),2025,46(04):34-42+119-120.DOI:10.15926/j.cnki.issn1672-6871.2025.04.005.
基金信息:
国家重点研发计划项目(2023YFF0611600); 杭州市农业与社会发展科研项目(20201203B159)