| 微小缺陷的非线性超声检测及其成像技术 |
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| 引用本文： | 陈振华,史耀武,赵海燕,王燕,张宁.微小缺陷的非线性超声检测及其成像技术[J].声学学报,2010,35(1):9-13. |
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| 作者姓名： | 陈振华 史耀武 赵海燕 王燕 张宁 |
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| 作者单位： | 1 北京工业大学材料学院 北京 100124; |
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| 基金项目： | 北京市教委汽车焊接技术转化平台资助项目 |
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| 摘 要： | 采用通用超声检测设备并结合高通滤波技术获取了非线性超声的高次谐波信号,并将其用于薄板点焊焊核的微小缺陷检测及焊核的超声C扫描成像中。较之传统超声检测方法,采用非线性高次谐波检测薄板点焊焊核缺陷具有更高的时域分辨率及缺陷敏感度,能够更加准确的确定内部缺陷的位置及尺寸。此外,本研究还采用非线性高次谐波对薄板焊核进行超声成像分析,获得了清晰准确的焊核结构图像。非线性超声检测技术具有更高的检测效力,能够显著拓展检测系统的检测能力。
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| 关 键 词： | 内部缺陷 成像技术 非线性效应 超声波 小缺陷 超声检测 检测方法 焊核 谐波信号 高次谐波 |
| 收稿时间： | 2008-12-03 |
Nonlinear ultrasonic testing and imaging for tiny flaw |
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| CHEN Zhenhua,SHI Yaowu,ZHAO Haiyan,WANG Yan,ZHANG Ning.Nonlinear ultrasonic testing and imaging for tiny flaw[J].Acta Acustica,2010,35(1):9-13. |
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| Authors: | CHEN Zhenhua SHI Yaowu ZHAO Haiyan WANG Yan ZHANG Ning |
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| Institution: | 1 School of Materials Science and Engineering, Beijing University of Technology Beijing 100124;2 Department of Mechanical Engineering, Tsinghua University Beijing 100084 |
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| Abstract: | The higher order harmonic component of nonlinear ultrasonic is obtained by the general ultrasonic testing device with a higher pass filter,and the higher order harmonic wave is adopted into the tiny flaw detection and the ultrasonic imaging of spot welds.The higher order harmonic wave has excellent sensitivity to the tiny flaw and higher resolution in the time domain than conventional ultrasonic wave.Thus,the size and the position of tiny flaw are easier to determine,though the thickness of spot weld is ver... |
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