埋地燃气聚乙烯管热熔接头的矢量相干全聚焦成像检测分析OA北大核心CSTPCD

The acoustic attenuation and acoustic dispersion characteristics of detect high-density polyethylene(HDPE)materials lead to ultrasonic attenuation,which affects the accuracy of ultrasonic phased array imaging of butt fusion joint.An improved vector coherent factor total focusing method(IVCF-TFM)is proposed and applied to the detection experiments of detect HDPE butt fusion joint holes defects(∅2 mm,∅3 mm)and side-drilled holes defects(∅2 mm,∅3 mm)in HDPE test blocks.The results show that the depth detection errors of side-drilled holes defects(∅2 mm,∅3 mm)are 0.9 mm and 0.3 mm.The depth detection errors of butt fusion joint hole defects(∅2 mm,∅3 mm)depth detection is 0.5 mm and 0.4 mm respectively.Compared with VCF-TFM,the signal-to-noise ratio of the proposed algorithm is improved by 3.4,3.6,3.7 and 2.5 dB respectively.Compared with TFM and VCF-TFM,the imaging efficiency of the proposed algorithm is reduced by 3.83%and 5.89%,respectively.This algorithm has certain advantages and application prospects in the imaging detection of HDPE materials.