螺纹边界法对圆柱超声缓冲杆尾随脉冲干扰的抑制  

Restraining the ultrasonic tail pulses in cylinder waveguide rod with the thread boundary method

作　　者：王少纯 甘芳吉[1] 张轶茗 廖俊必[1] WANG Shaochun;GAN Fangji;ZHANG Yiming;LIAO Junbi(School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China;Safety, Environment ＆ Technology Supervision Research Institute of Southwest Oil ＆ Gas Company, PetroChina Co., Ltd.,Chengdu 610041, China)

机构地区：[1]四川大学制造科学与工程学院,成都610065 [2]中石油西南油气田分公司安全环保与技术监督研究院,成都610041

出　　处：《应用声学》2018年第3期324-329,共6页Journal of Applied Acoustics

基　　金：国家自然科学基金资助项目(61271329);四川省科技支撑计划资助项目(2012GZ0094);中国石油科技创新基金项目(2015D-5006-0607)

摘　　要：对于高温管道壁厚的超声波在线监测,需要超声波探头与缓冲杆搭配使用,以降低探头的接触温度。超声波在圆柱形缓冲杆的边界会发生波型转换,在缓冲杆的第一次和第二次底面回波之间产生等间隔的尾随脉冲干扰,影响管道内壁回波的识别与提取。该文创新性地采用螺纹边界法改变缓冲杆的边界特征以抑制尾随脉冲干扰,经实验验证螺纹边界法对尾随脉冲干扰有较好的抑制效果;不同螺纹螺距的实验对比表明,对于直径为20 mm的钢材料圆柱缓冲杆,在1 mm、2 mm和3 mm三种螺距中,螺距为2 mm的螺纹边界对5 MHz超声波的尾随脉冲干扰的抑制效果最强。In the ultrasonic thickness monitoring of high temperature pipeline, ultrasonic probe and bufferrod need to be used together to reduce the contact temperature of the probe. Because of the ultrasonic wavemodeconversion at the boundary of the cylindrical probe waveguide rod, the uniformly spaced ultrasonic tailpulses will be produced between the first subface echo and the second subface echo, and these tail pulses mayinfluence the identification and extraction of echo signal of the inner wall of pipeline. In this paper, the screwboundary method is proposed to change the boundary characteristics of the buffer rod and suppress the tailpulses. The experimental results show that the screw boundary method has a good inhibitory effect on tailpulses. Specifically, in the 20 mm diameter cylinder steel buffer rod, the screw boundary with 2 mm screwpitch has the strongest inhibitory effect on tail pulses of 5 MHz ultrasonic wave among the screw pitches of1 mm, 2 mm and 3 mm.

关 键 词：超声波缓冲杆 尾随脉冲干扰 高温监测 

分 类 号：TH89[机械工程—仪器科学与技术]