Volume 15 Issue 4
Jul.  2022
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ZHANG Xiao-qing, WANG Chi, LI Jin-hui, LUO Xin-yu, YU Ying-jie. Analysis of the relationship between the mode shapes of a landmine’s upper casing and its laser speckle interference signal[J]. Chinese Optics, 2022, 15(4): 812-824. doi: 10.37188/CO.EN.2022-0001
Citation: ZHANG Xiao-qing, WANG Chi, LI Jin-hui, LUO Xin-yu, YU Ying-jie. Analysis of the relationship between the mode shapes of a landmine’s upper casing and its laser speckle interference signal[J]. Chinese Optics, 2022, 15(4): 812-824. doi: 10.37188/CO.EN.2022-0001

Analysis of the relationship between the mode shapes of a landmine’s upper casing and its laser speckle interference signal

doi: 10.37188/CO.EN.2022-0001
Funds:  Supported by the National Natural Science Foundation of China (No. 62175144, No. 61773249); the Science and Technology on Near-Surface Detection Laboratory (No. TCGZ2020C003); Shanghai Science and Technology Innovation Action Plan (No. 20142200100)
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  • Author Bio:

    Xiao-qing ZHANG (1984—), female, M.S. She was born in Shangyu, Zhejiang in 1984 and received a M.S. degree in Communication and Information Systems from Nanchang Hangkong University in 2007. She is currently pursuing a PhD degree in the School of Mechatronic Engineering and Automation, Shanghai University. In the meantime, she works in Tongji Zhejiang College in the Jiaxing city of Zhejiang. Her research area is optical detection technology, signal and information processing. E-mail: zxq2018@shu.edu.cn

    Chi WANG (1982—), male, Ph.D. He was born in Taikang, Henan in 1982, and received his Ph.D. degree in measurement technology and instruments from Tianjin University in 2009. Currently, he is a professor in the School of Mechatronic Engineering and Automation, Shanghai University. His main research interests include optical detection technology. E-mail: wangchi@shu.edu.cn

  • Corresponding author: wangchi@shu.edu.cn
  • Received Date: 07 Jan 2022
  • Rev Recd Date: 28 Feb 2022
  • Available Online: 28 Jun 2022
  • The mapping relationship between the mode shapes of a plastic landmine’s upper casing and its laser speckle interference signal was studied. The mode shape function of a landmine’s upper casing is established according to the vibration equation of its thin circular plate. Then, based on the principle of laser shearing speckle interference and the time-average method of a CCD camera, we mapped the out-of-plane displacement of the mode shape to the phase of the interference laser. The study shows that the different mode shapes of the landmine correspond to the unique Bessel fringes. Furthermore, the Bessel fringes of two modes are simulated, and the corresponding experiments were carried out. Both the numerical and experimental results confirm the theoretical conclusions, the research in this paper can provide theoretical evidence for realizing the rapid scanning technology of acoustic-optics landmine detection.

     

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