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Volume 27 Issue 6
Sep.  2013
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Reflected laser ultrasonic sensor for testing thickness and its application

  • 1.

    Department of Applied Physics, Nanjing University of Science & Technology, Nanjing, 210094

  • Received Date: 2003-04-25
    Accepted Date: 2003-06-30
  • A new laser ultrasonic sensor for testing samples' thickness is developed.The detection principle is discussed in detail.This sensor has high-frequency response,high sensitivity and is easy to adjust.The sensor is used to detect laser-induced ultrasonic longitude-wave at the epicenter of the rear metallic surface when pulse Nd:YAG laser is focused on polished iron plate.Well-defined longitude-wave and its echo waves are acquired.Based on the experimental results,the sample's thickness can be deduced.The theoretical and experimental results are in good agreement with relative error of 0.5%.
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  • [1] 应崇福.超声学.北京:科学出版社,1993:103～112.
    [2] 袁易全.超声换能器.南京:南京大学出版社,1989:130～191.
    [3] 金长善.超声工程.哈尔滨:哈尔滨工业大学出版社,1989:189～205.
    [4] 袁易全,陈思忠.近代超声原理与应用.南京:南京大学出版社,1996:353～354.
    [5]

    Aussel J D,Brun A L,Baboux J C.Ultrasonics,1988,26:245～255.
    [6] 陆建,侯锐,陈建平 et al.第八届现代声学国际会议.北京:科学出版社,2001,11(S312):103～105.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Reflected laser ultrasonic sensor for testing thickness and its application

  • 1. Department of Applied Physics, Nanjing University of Science & Technology, Nanjing, 210094
  • Received Date: 2003-04-25
  • Accepted Date: 2003-06-30
  • Available Online: 2003-11-25

Abstract: A new laser ultrasonic sensor for testing samples' thickness is developed.The detection principle is discussed in detail.This sensor has high-frequency response,high sensitivity and is easy to adjust.The sensor is used to detect laser-induced ultrasonic longitude-wave at the epicenter of the rear metallic surface when pulse Nd:YAG laser is focused on polished iron plate.Well-defined longitude-wave and its echo waves are acquired.Based on the experimental results,the sample's thickness can be deduced.The theoretical and experimental results are in good agreement with relative error of 0.5%.

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