雷体罩模态振型与激光散斑干涉信号的关系解析  

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

作　　者：张小青 王驰[1,3] 李金辉 罗欣宇 于瀛洁 ZHANG Xiao-qing;WANG Chi;LI Jin-hui;LUO Xin-yu;YU Ying-jie(Department of Precision Mechanical Engineering,Shanghai University,Shanghai 200444,China;Department of Electronic and Information Engineering,Tongji Zhejiang College,Jiaxing 314000,China;Science and Technology on Near-surface Detection Laboratory,Wuxi 214035,China)

机构地区：[1]上海大学精密机械工程系,上海200444 [2]同济大学浙江学院电子与信息工程系,嘉兴314000 [3]近地面探测技术重点实验室,无锡214035

出　　处：《中国光学（中英文）》2022年第4期812-824,共13页Chinese Optics

基　　金：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)。

摘　　要：本文研究了塑壳雷体罩的振型与激光散斑干涉信号之间的映射关系。根据薄圆板的振动方程,建立了地雷上壳体的振型函数。基于激光剪切散斑干涉原理和CCD相机的时间平均法,将振型的离面位移映射到干涉激光的相位。建立的映射关系表明地雷的不同振型对应于独特的贝塞尔条纹。此外,还模拟分析了两种模式的贝塞尔条纹,并进行了实验验证,数值计算和实验结果均验证了理论结论。本文研究为实现声光探雷的快速扫描技术提供了理论依据。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.

关 键 词：声震探雷 散斑干涉 贝塞尔条纹 时间平均 

分 类 号：TN249[电子电信—物理电子学] TJ512[兵器科学与技术—军事化学与烟火技术]