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Noncontact method applied to determine thickness of thin layer based on laser ultrasonic technique

机译：基于激光超声技术的非接触法确定薄层厚度

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摘要

This paper describes a novel method to non-destructively determine the thickness of thin layer in a non-contact way. A model of wave interference was established based on the multireflection of shear wave in layered system. Furthermore, its expression of reflection coefficient phase was deduced to provide the principle of thickness measurement. A formed laser source by focusing a line on the layer surface was used to generate shear wave, while an electromagnetic acoustic testing (EMAT) sensor was proposed to receive the wave. An example of the method and experimental measurement for comparison is given for a thin steel sheet with the thickness of approximate 0.4 mm. The relative error between the present method and metallography method is less than 4%, which shows laser-EMAT technique is very suitable to non-destructive assess the thickness of the layer.
机译：本文介绍了一种以非接触方式无损确定薄层厚度的新方法。基于层状系统中剪切波的多次反射，建立了波干扰模型。此外，推导了其反射系数相位的表达式，以提供厚度测量的原理。通过在层表面上聚焦一条线而形成的激光源被用来产生剪切波，而电磁声学测试（EMAT）传感器被提议接收该波。举例说明了厚度约为0.4毫米的薄钢板的比较方法和实验测量结果。本方法与金相方法之间的相对误差小于4％，这表明激光EMAT技术非常适合于无损评估层的厚度。

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  • 来源
    《Materials Research Innovations》 |2014年第2期|S2.1081-S2.1085|共5页
  • 作者

    Zhao Y.; Ma J.; Chen J. W.; Ouyang H.; Wang M. H.; Zhao P.; Zhang B.;

  • 作者单位

    Shandong Acad Sci, Laser Inst, NDT&E Lab, Jinan 250014, Peoples R China;

    Shandong Acad Sci, Laser Inst, NDT&E Lab, Jinan 250014, Peoples R China;

    Shandong Acad Sci, Laser Inst, NDT&E Lab, Jinan 250014, Peoples R China;

    Aviation Ind Corp China, AVIC Shenyang Engine Design & Res Inst, Dept 11, Shenyang 110015, Peoples R China;

    Shandong Acad Sci, Laser Inst, NDT&E Lab, Jinan 250014, Peoples R China;

    Shandong Acad Sci, Laser Inst, NDT&E Lab, Jinan 250014, Peoples R China;

    Chinese Acad Sci, Shenyang Inst Automat, Key Lab Ind Informat, Shenyang 110016, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nondestructive testing; Laser ultrasonic; EMAT; Thin layer;

    机译：无损检测激光超声EMAT薄层;

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