水浸超声线聚焦探头发射声场测量方法  

The measurement method of emission acoustic field of water immersion ultrasonic line focusing probe

作　　者：曹永朋 张先锋 陆杨星 于磊[1] CAO Yongpeng;ZHANG Xianfeng;LU Yangxing;YU Lei(Anhui Special Equipment Inspection Institute,Hefei 230051,China;Anhui Natural Gas Development Co.,Ltd.,Hefei 230051,China)

机构地区：[1]安徽省特种设备检测院,合肥230051 [2]安徽省天然气开发股份有限公司,合肥230051

出　　处：《应用声学》2024年第4期775-782,共8页Journal of Applied Acoustics

摘　　要：航空构件常用小直径棒材进行加工制造,棒材的缺陷检测成为保证构件加工和使用质量的重要手段。但水浸超声点聚焦检测柱形或球形工件时易发生声束发散,检测灵敏度低下,而水浸超声线聚焦探头作为小直径棒材曲面检测的特殊应用,其声场分布决定了探头的检测能力与检测效率,因此线聚焦探头声场测量对小直径棒材检测具有重要意义。选取三只标称频率均为10 MHz,水中焦距分别为25 mm、38 mm、60 mm以及一只探头标称频率为15 MHz,水中焦距为20 mm水浸线聚焦超声探头。分别采取大平底、Φ3.18 mm的球靶和Φ1.5 mm的钢棒作为反射体,通过三轴自动化装置带动探头运动,得到不同反射体所测量的探头声场特性参数,并对测量结果进行对比,分析线聚焦探头声场测量方法。结果表明采用钢丝调整后球靶法可得到线聚焦探头较为准确的声场分布,采用钢丝法结合球靶法能够能到线聚焦探头较为准确的声场特征参数。Aviation components are commonly processed and manufactured with small-diameter bars,and the defect detection of bars has become an important means to ensure the quality of component processing and use.However,the sound beam divergence is easy to occur when the water immersion ultrasonic point focus detects cylindrical or spherical workpieces,and the detection sensitivity is low,and the water immersion ultrasonic line focusing probe is a special application for the detection of small diameter bar surfaces,and its sound field distribution determines the detection ability and detection efficiency of the probe,so the sound field measurement of the line focusing probe is of great significance for the detection of small diameter bars.Three immersion line focused ultrasound probes with a nominal frequency of 10 MHz and a focal length of 25 mm,38 mm and 60 mm in water,and a nominal frequency of 15 MHz and a focal length of 20 mm in water,were selected.The large flat bottom,Φ3.18 mm ball target andΦ1.5 mm steel rod were used as reflectors,and the probe motion was driven by the three-axis automation device to obtain the characteristic parameters of the sound field of the probe measured by different reflectors,and the measurement results were compared,and the measurement method of the line focusing probe was analyzed.The results show that the accurate sound field distribution of the line focusing probe can be obtained by using the steel wire adjusted spherical target method,and the more accurate sound field characteristic parameters of the line focusing probe can be obtained by using the steel wire method combined with the spherical target.

关 键 词：水浸线聚焦探头 声场测量 水浸检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]