• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (10): 10-16.doi: 10.3901/JME.2019.10.010

• 仪器科学与技术 • 上一篇    下一篇

空气耦合超声换能器的频域声场研究

李骥1,2, 李力1, 邓勇刚3, PIWAKOWSKI Bogdan2, 陈法法1   

  1. 1. 水电机械设备设计与维护湖北省重点实验室(三峡大学) 宜昌 443002;
    2. 里尔中央理工电子、微电子与纳米技术研究所(法国国家科学研究中心) 里尔 59651 法国;
    3. 中国石油川庆钻探工程有限公司安全环保质量监督检测研究院 广汉 618300
  • 收稿日期:2018-05-16 修回日期:2019-01-02 出版日期:2019-05-20 发布日期:2019-05-20
  • 通讯作者: 李力(通信作者),女,1964年出生,博士,教授。主要研究方向为信号处理、故障诊断、超声无损检测等。E-mail:li7466@ctgu.edu.cn
  • 作者简介:李骥,男,1988年出生,博士。主要研究方向为空气耦合超声检测。E-mail:liji2615@outlook.com
  • 基金资助:
    法国国家科学研究中心(SENSO、ENDE)、国家留学基金委(CSC)和国家自然科学基金(51875314)资助项目

Study on Acoustic Field of Air-coupled Ultrasonic Transducer in Frequency Domain

LI Ji1,2, LI Li1, DENG Yonggang3, PIWAKOWSKI Bogdan2, CHEN Fafa1   

  1. 1. Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002;
    2. Institute of Electronics, Microelectronics & Nanotechnologies, Centrale Lille, Lille 59651, France;
    3. CCDC Safety Environment and Quality Surveillance and Inspection Research Institute, Guanghan 618300
  • Received:2018-05-16 Revised:2019-01-02 Online:2019-05-20 Published:2019-05-20

摘要: 考虑介质的衰减及其引起的频散对频域声场的影响,提出幂函数衰减介质中圆形换能器声场的解析公式。基于该公式研究空气耦合超声换能器的轴向声压与径向声压分布特征。结果表明:空气中的衰减是引起声场变化的主要因素;相对于零衰减介质,空气中的声压幅度随着传播距离的增加而明显降低,近场长度明显减小,近场内轴向声压的零点、极大值点无偏移,径向声压分布和声束扩散角无变化。研究结果对于空气耦合换能器的设计、空气耦合声场的测量、校准具有重要参考价值,并可以作为ASTM E1065/E1065-14和IEC 62127标准的补充。

关键词: 径向声压, 空气耦合超声, 幂函数衰减, 频域声场, 轴向声压

Abstract: The influence of medium attenuation and the associated dispersion is considered of acoustic field in frequency domain. An analytical solution for the acoustic field radiated from circular ultrasonic transducer into lossy medium with power law attenuation is proposed. Based on the solution, a research on the axial-and radial-acoustic pressure distribution of air-coupled transducer is performed and it shows that:attenuation is the main factor causing acoustic field distortion in air; compared with non-attenuation case, in air, the amplitude of acoustic pressure drops down evidently as a function of propagation distance, the near-field length decreases, the zero-and maxima-points in near-field stay the same, the shape of directivity pattern and beam spread angle have no difference. The result is a good reference for the design of air-coupled transducer and the corresponding acoustic field measurement and calibration; as well it could be a compliment of transducer characterization standard ASTM E1065/E1065-14 and IEC 62127.

Key words: acoustic field in frequency domain, air-coupled ultrasonic, axial acoustic pressure, power law attenuation, radial acoustic pressure

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