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基于幅度调制的非线性超声相控阵成像方法*

本站小编 Free考研考试/2022-01-02
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刘志勇,滕达,项延训.基于幅度调制的非线性超声相控阵成像方法*[J].,2021,40(6):856-864
基于幅度调制的非线性超声相控阵成像方法*
Research on nonlinear ultrasonic phased array imaging based on amplitude modulation
投稿时间：2021-01-08修订日期：2021-11-04
中文摘要:
超声相控阵是超声检测领域常用的材料缺陷定位和成像技术，可便捷快速地对裂纹、孔洞等缺陷进行成像。但是，传统超声相控阵方法对较小缺陷如闭合裂纹不太敏感。非线性超声信号因对材料性能退化以及微小缺陷敏感而广受关注。本文针对疲劳闭合裂纹检测，提出一种基于幅度调制的非线性超声相控阵成像方法，通过测量物理聚焦和虚拟聚焦两种聚焦模式下超声扩散场中的声能差，并将其作为非线性参量，实现疲劳裂纹闭合部分的定位成像和定量表征。将该法应用于7075铝合金试样疲劳裂纹的实验测量，并研究了扩散场信号延迟时间对非线性超声相控阵成像结果的影响。结果表明：相较于传统超声相控阵全聚焦法，基于幅度调制的非线性超声相控阵成像方法能够更准确地定位和成像疲劳裂纹闭合部分；延迟时间的选择对疲劳裂纹长度的表征精度影响较大，本文研究了该延迟时间的选择方法并实现了检测结果的优化。
英文摘要:
Ultrasonic phased array is a common material defect location and imaging technology in ultrasonic testing, which can quickly image defects like cracks, holes. However, traditional ultrasonic phased array method is less sensitive to smaller defects such as closed cracks. Nonlinear ultrasonic signals are widely concerned because of their sensitivity to material degradation and minor defects. Aiming at the detection of fatigue closed cracks, this paper proposes a nonlinear ultrasonic phased array imaging method based on amplitude modulation, which measures the sound energy difference in the ultrasonic diffusion field under two focusing modes of physical focus and virtual focus, and uses the sound energy difference as the nonlinear parameter to realize the positioning imaging and quantitative characterization of the closed part of fatigue crack. The method was applied to the experimental measurement of fatigue cracks of 7075 aluminum alloy specimen, and the influence of the diffusion field signal delay on the results of nonlinear ultrasonic phased array imaging was studied. The results show that compared with the full focusing method commonly used in ultrasonic phased array, the nonlinear ultrasonic phased array imaging method can locate and image the closed part of fatigue crack more accurately. The choice of delay time has a great influence on the accuracy of fatigue crack length characterization. This paper studies the choice of delay time and optimizes the detection results.
DOI：10.11684/j.issn.1000-310X.2021.06.007
中文关键词:非线性超声成像相控阵幅度调制闭合裂纹
英文关键词:nonlinear ultrasonic imagingphased arrayamplitude modulationclosed crack
基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）
作者单位E-mail
刘志勇华东理工大学1054787560@qq.com
滕达华东理工大学
项延训华东理工大学
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