基于多参数耦合和反演初始值修正的混凝土孔洞缺陷超声层析成像方法研究

吴琛; 刘彧; 邵顺安; 麻胜兰

doi:10.13204/j.gyjzG23042608

基于多参数耦合和反演初始值修正的混凝土孔洞缺陷超声层析成像方法研究

doi: 10.13204/j.gyjzG23042608

吴琛¹,
刘彧¹,
邵顺安²,
麻胜兰^1, ,

1. 福建理工大学, 福建省土木工程新技术与信息化重点实验室, 福州 350118;
2. 福建省建筑工程质量检测中心有限公司, 福州 350108

基金项目:

国家自然科学基金面上项目（52378494）；福建省高校产学合作项目（2022H6032）；福建省科技厅项目（2020J05184）。

详细信息

作者简介:
吴琛,女,1978年出生,教授,博士生导师。

通讯作者:
麻胜兰,博士,副教授,mashenglan@fjut.edu.cn。

计量
- 文章访问数: 54
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-26
- 网络出版日期: 2023-12-18

Research on Ultrasonic Tomography of Concrete Hole Defects Based on Multi-Parameter Coupling and Inversion Initial Value Correction

1. Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Fujian Construction Engineering Quality Inspection Center Co., Ltd., Fuzhou 350108, China

摘要

摘要: 超声波法与层析成像技术相结合是实现混凝土孔洞缺陷可视化检测的常用方法。针对以单一声参数为超声判据易导致缺陷误判漏判的问题，提出超声波多参数耦合的缺陷综合判别方法；针对以初始波速经验赋值和走时误差均匀分配为特征的层析成像精度不高的问题，提出基于反演初始值修正的图像重建方法。并开展多种孔洞尺寸、孔洞数量工况下的混凝土超声检测试验，检验了改进方法的有效性。结果表明：基于声速-幅值-频率三参数耦合的缺陷综合判别可实现混凝土孔洞缺陷的精准定位，其精度优于单参数或双参数耦合的判别方法；基于反演初始值修正的超声层析成像方法能准确赋值波速迭代初始值并使走时误差分配更符合缺陷分布规律，可准确识别直径5 mm以上的孔洞。
- 声速-幅值-频率耦合 /
- 反演初始值 /
- 孔洞缺陷 /
- 超声波法 /
- 层析成像
Abstract: The combination of ultrasonic method and tomographic imaging technology is a common method to realize the visual defection of concrete hole defects. Herein, a comprehensive identification method was proposed to address the problem of defect misjudgment and missing judgment caused by using a single acoustic parameter as the criterion for ultrasonic testing. Additionally, an image reconstruction method based on inversion initial value correction was used to address the problem of low accuracy in tomographic imaging, which is often characterized by empirical assignment of initial wave velocity and uniform distribution of travel time error. The effectiveness of the modified method was verified through experiments on concrete specimens with different hole sizes and numbers. The results showed that the comprehensive defect discrimination based on the coupling of sound velocity, amplitude and frequency could accurately identify hole defects in concrete, with better accuracy than single-parameter or two-parameter coupling method. The ultrasonic tomography method based on inversion initial value correction could accurately assign the initial value of wave velocity iteration and make the distribution of travel time error more consistent with the defect distribution law.The method was effective for identifying holes larger than 5 mm.
- acoustic velocity-amplitude-frequency coupling /
- inversion initial value /
- hole defect /
- ultrasonic method /
- tomographic imaging technology

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