掩埋物对声-地震耦合效率的影响
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摘要
为验证声共振探雷模型对地雷的鉴别能力,研究了不同掩埋物对声-地震耦合效率的影响.首先,简述声波共振技术探测地雷的基本原理及其实验系统;其次,检测在没有埋藏物、埋藏地雷及埋藏砖头3种情况下声波激发的地表振动速度的幅频特性曲线;最后,用有无掩埋物地表振动速度相对值的数据处理方法分析地雷对地表振动的影响.研究结果显示,埋藏地雷与没有埋藏物的地表振动速度的比值在很宽的频带内大于1,地雷能引起地表振动状态的明显变化.表明掩埋地雷能提高声-地震耦合效率,声共振探雷模型具有较强的地雷鉴别能力.
In order to verify the ability of acoustic resonance model for mine discrimination,different buried objects were used to study their impact on acoustic-to-seismic coupling efficiency.First,the fundamental theory of acoustic resonance technique for mine detection and the according experimental system were described.Second,the velocity spectrum amplitude plots of acoustically induced surface vibration were measured,with nothing,a mine and a brick buried,respectively.Finally,relative velocity value method was adopted to analyze the impact of mine on surface vibration.The results showed that the ratio of on-to-off mine appears greater than 1 within wide frequency range,and thus a mine can result in distinct change of acoustically induced surface vibration.Therefore,buried mines can improve acoustic-to-seismic coupling efficiency,and the acoustic resonance model has a high ability to distinguish buried mines.
In order to verify the ability of acoustic resonance model for mine discrimination,different buried objects were used to study their impact on acoustic-to-seismic coupling efficiency.First,the fundamental theory of acoustic resonance technique for mine detection and the according experimental system were described.Second,the velocity spectrum amplitude plots of acoustically induced surface vibration were measured,with nothing,a mine and a brick buried,respectively.Finally,relative velocity value method was adopted to analyze the impact of mine on surface vibration.The results showed that the ratio of on-to-off mine appears greater than 1 within wide frequency range,and thus a mine can result in distinct change of acoustically induced surface vibration.Therefore,buried mines can improve acoustic-to-seismic coupling efficiency,and the acoustic resonance model has a high ability to distinguish buried mines.
引文
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[2]Sabatier J M,Bass H E,Bolen L N,et al.The interac-tion of airborne sound with the porous ground:Thetheoretical formulation[J].J Acoust Soc Am,1986,79(5):1345-1352.
[3]Sabatier J M,Bass H E,Bolen L N,et al.Acousticallyinduced seismic waves[J].J Acoust Soc Am,1986,80(2):646-649.
[4]Bass H E,Sabatier J M.Acoustic-to-seismic couplingand physical measurements[C]//Proceedings of SPIE4038,Detection and Remediation Technologies forMines and Minelike Targets V.Orlando,USA,2000,4038:604-609.
[5]Sabatier J M,Xiang N.An investigation of acoustic-to-seismic coupling to detect buried antitank landmines[J].IEEE Transactions on Geoscience and Remote Sensing,2001,39(6):1146-1154.
[6]Xiang N,Sabatier J M.An experimental study on anti-personnel landmine detection using acoustic-to-seismiccoupling[J].J Acoust Soc Am,2003,113(3):1333-1341.
[7]Donskoy D,Reznik A,Zagrai A,et al.Nonlinearvibrations of buried land mines[J].J Acoust Soc Am,2005,117(2):690-700.
[8]Donskoy D.Nonlinear seismo-acoustic landmine detec-tion[J].J Acoust Soc Am,2008,123(5):3042-3043.
[9]Tesei A,Fawcett J A,Lim R.Physics-based detectionof man-made elastic objects buried in high-density-clutterareas of saturated sediments[J].Applied Acoustics,2008,69:422-437.
[10]Sullivan E J,Xiang N,Candy J V.Adaptive model-based mine detection/localization using noisy laser Dop-pler vibration measurements[C]//OCEANS 2009-EUROPE.Bremen,Germany,2009:1-4.
[11]Khan Umar S,Al-Nuaimy Waleed,Abd El-Samie,etal.Detection of landmines and underground utilities fromacoustic and GPR images with a cepstral approach[J].JVisual Commun Image Represent,2010,21(7):731-740.
[12]王驰,刘志刚,李醒飞,等.声-地震耦合探雷技术分析[J].声学学报,2008,33(4):354-359.Wang Chi,Liu Zhigang,Li Xingfei,et al.Analysis ofacoustic to seismic coupling technique for buried land-mines detection[J].Acta Acustica,2008,33(4):354-359(in Chinese).
[13]王驰,刘志刚,李醒飞,等.基于相对声-地震耦合率的声波探雷技术[J].天津大学学报,2008,41(6):745-750.Wang Chi,Liu Zhigang,Li Xingfei,et al.Technologyfor acoustic landmine detection based on relative acous-tic-to-seismic coupling ratio[J].Journal of Tianjin Uni-versity,2008,41(6):745-750(in Chinese).
[14]王驰,李醒飞,于瀛洁,等.土壤-地雷共振系统模型解析[J].物理学报,2010,59(9):6319-6325.Wang Chi,Li Xingfei,Yu Yingjie,et al.Analysis ofsoil-mine resonance model[J].Acta Physica Sinica,2010,59(9):6319-6325(in Chinese).
[15]王驰,于瀛洁,李醒飞.一种基于声-地震耦合的室内声波探雷实验系统[J].天津大学学报,2011,44(1):79-84.Wang Chi,Yu Yingjie,Li Xingfei.An acoustic-to-seismic coupling based landmines detection system inlab-scale experimental environment[J].Journal of Tian-jin University,2011,44(1):79-84(in Chinese).
[16]王驰,李醒飞,付娟,等.声波探雷及其信号处理方法研究[J].光学精密工程,2008,16(9):1716-1721.Wang Chi,Li Xingfei,Fu Juan,et al.Acoustic land-mine detection and its signal processing method[J].Op-tics and Precision Engineering,2008,16(9):1716-1721(in Chinese).
[17]杨顶辉.双相各向异性介质中弹性波方程的有限元解法及波场模拟[J].地球物理学报,2002,45(4):575-583.Yang Dinghui.Finite element method of the elastic waveequation and wavefield simulation in two-phase anisot-ropic media[J].Chinese Journal of Geophysics,2002,45(4):575-583(in Chinese).
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