• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (14): 11-18.doi: 10.3901/JME.2019.14.011

• 仪器科学与技术 • 上一篇    下一篇

电磁超声检测频率自适应优化方法研究

郑阳1, 周进节2, 张宗健1, 谭继东1   

  1. 1. 中国特种设备检测研究院 北京 100029;
    2. 中北大学机械工程学院 太原 030051
  • 收稿日期:2018-07-18 修回日期:2018-12-23 出版日期:2019-07-20 发布日期:2019-07-20
  • 通讯作者: 周进节(通信作者),男,1981年出生,博士。主要研究方向为超声和超声导波检测方法,传感器与检测仪器,声场可视化技术等。E-mail:zhoujinjiechina@126.com
  • 作者简介:郑阳,男,1984年出生,博士,高级工程师。主要研究方向为电磁超声、相控阵超声、超声导波、磁声多参数等检测方法,传感器与检测仪器开发等。E-mail:zhengyangchina@126.com;张宗健,男,1990年出生,硕士,工程师。主要研究方向为电磁超声传感器研制及性能评估、电磁超声高温检测方法等。E-mail:zhangzongjiancn@126.com;谭继东,男,1988年出生,硕士,工程师。主要研究方向为磁巴克豪森、磁特性、磁多参数等检测方法,传感器与仪器开发等。E-mail:tanjidongchina@163.com
  • 基金资助:
    国家重点研发计划(2016YFF0203003)、国家自然科学基金(51605494,61601413)和质检总局科技计划(2017QK185)资助项目。

Research on Frequency Adaptive Optimization Method of Electromagnetic Acoustic Testing

ZHENG Yang1, ZHOU Jinjie2, ZHANG Zongjian1, TAN Jidong1   

  1. 1. China Special Equipment Inspection and Research Institute, Beijing 100029;
    2. School of Mechanical Engineering, North University of China, Taiyuan 030051
  • Received:2018-07-18 Revised:2018-12-23 Online:2019-07-20 Published:2019-07-20

摘要: 电磁超声(Electromagnetic acoustic testing,EMAT)检测易受温度、提离和被检对象材料的影响,使换能器的辐射声场、阻抗特性和换能效率发生变化,导致同样的检测系统及参数在不同工况下检测效果差异很大。其中检测频率是需要优化的关键因素之一,实验室常采用逐个频率点扫频测试寻找最佳检测频率的方法进行优化,效率极低,难以在现场实时应用。提出一种基于线性Chirp信号实现电磁超声传感器最佳检测频率快速优化的方法,通过数据处理的方式,可以在一次激励接收过程中,实现对一段频率中各频率点检测信号的提取,从而快速优化得到工况下相对最佳检测频率。采用该方法的检测系统可自适应现场温度、接触条件及被检对象变化,实时优化选择检测频率,得到最佳检测效果。

关键词: 参数优化, 电磁超声, 检测频率, 影响因素, 自适应

Abstract: Electromagnetic acoustic testing (EMAT) is susceptible to temperature, lift-off and the material of the tested subject, which makes the impedance characteristics and energy conversion efficiency of the transducer change. Therefore, the inspection results vary widely even with the same detection system and parameters but in different work conditions. The testing frequency is a key factor that needs to be optimized among the many factors that affect the testing performance. Normally, the frequency sweeping method is used to find the optimal inspection frequency in the laboratory environment. This method is extremely inefficient and difficult to be used in practice. A method based on the principle of linear Chirp for fast optimizing testing frequency of EMAT is proposed. Through the way of data processing, the testing signal of each frequency point in a frequency range can be extracted in a single excitation receiving process, thereby quickly optimizing and obtaining the optimal testing frequency. Further, the testing system adopting this method can adapt to changes in temperature, contact conditions, and objects to be inspected in the field, optimize the testing frequency in real time, and obtain the best detection effect.

Key words: adaptive, electromagnetic acoustic, influencing factors, parameter optimization, testing frequency

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