基于相对声-地震耦合率的声波探雷技术
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摘要
为了分析基于相对声-地震耦合率法探测地雷的理论模型,设计了一个声波探雷实验系统.根据声-地震耦合原理,用解析法研究土壤-地雷共振机制;采用扬声器发出可扫频的单音正弦波穿透到地下土壤,作为系统信号激励源;并用声级计和地震检波器串分别测出地表处的声压级及地表振动速度;画出有无地雷时的相对声-地震耦合率的变化曲线.实验结果显示,在给定实验条件下该相对比值在很宽的频率范围内都大于1,最大峰值能达到16.现场实验证明了该实验系统能有效完成测量任务,利用所提的相对声-地震耦合率法可进行地雷探测的进一步研究.
In order to analyze the theoretical model for relative acoustic-to-seismic coupling ratio method to detect land-mine,an experimental system for acoustic landmines detection was developed.First,according to acoustic-to-seismic cou-pling theory,an analytic method was adopted to study the resonance mechanism of soil-landmine system.Then a loud-speaker was used as energy source to insonify a swept sine tone over the soil.And a sound level meter and a geophone array were respectively employed to measure the acoustic pressure level and vibration velocity on the surface.Finally,the relative acoustic-to-seismic coupling ratio with mine or not was plotted.The results show that,given the experimental condition,the relative value appears greater than 1,and up to 16 within wide frequency ranges.The in situ experiments proved that the measuring system can realize the test efficiently and the proposed relative acoustic-to-seismic coupling ratio method can be applied to further investigation of landmines detection.
In order to analyze the theoretical model for relative acoustic-to-seismic coupling ratio method to detect land-mine,an experimental system for acoustic landmines detection was developed.First,according to acoustic-to-seismic cou-pling theory,an analytic method was adopted to study the resonance mechanism of soil-landmine system.Then a loud-speaker was used as energy source to insonify a swept sine tone over the soil.And a sound level meter and a geophone array were respectively employed to measure the acoustic pressure level and vibration velocity on the surface.Finally,the relative acoustic-to-seismic coupling ratio with mine or not was plotted.The results show that,given the experimental condition,the relative value appears greater than 1,and up to 16 within wide frequency ranges.The in situ experiments proved that the measuring system can realize the test efficiently and the proposed relative acoustic-to-seismic coupling ratio method can be applied to further investigation of landmines detection.
引文
[1]Sabatier J M,Xiang N.An investigation of acoustic-to-seismic coupling to detect buried anti-tank landmines[J].IEEE Trans Geosci Remote Sens,2001,39:1146-1154.
[2]Xiang N,Sabatier J M.Land mine detection measure-ments using acoustic-to-seismic coupling[C]//Detec-tion and Remediation Technologies for Mines and Mine-like Targets V,Proc SPIE 4038.Orlando:International Society for Optical Engineering,2000:645-655.
[3]Donskoy D,Ekimov A,Sedunov N,et al.Nonlinear seismo-acoustic land mine detection and discrimination[J].Journal of the Acoustical Society of America,2002,111:2705-2714.
[4]Scott W R,Martin J S,Larson G.Experimental model for a seismic landmine detection system[J].IEEE Trans Geosci Remote Sens,2001,39:1155-1164.
[5]Sabatier J M,Bass H E,Bolen L N.Acoustically induced seismic waves[J].Journal of the Acoustical Society of America,1986,80(2):646-649.
[6]Biot M A.Theory of propagation of elastic waves in a fluid-saturated porous solid(I):Low-frequency range[J].Journal of the Acoustical Society of America,1956,28(2):168-178.
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[8]Hickey C J,Sabatier J M.Measurements of two types of dilatational waves in an air-filled unconsolidated sand[J].Journal of the Acoustical Society of America,1997,102:128-136.
[9]Bass H E,Sabatier J M.Acoustic to seismic coupling and physical measurements[C]//Detection and Remedia-tion Technologies for Mines and Minelike Targets V,Proceedings of SPIE 4038.Orlando:International Soci-ety for Optical Engineering,2000:604-609.
[10]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 wave equation and wavefield simulation in two-phase anisot-ropic media[J].Chinese J Geophys,2002,45(4):575-583(in Chinese).
[11]裴正林.三维双相各向异性介质弹性波方程交错网格高阶有限差分法模拟[J].中国石油大学学报:自然科学版,2006,30(2):16-20.Pei Zhenglin.A staggered-grid high-order finite differ-ence method for modeling elastic wave equation in 3-D dual-phase anisotropic media[J].Journal of China University of Petroleum,2006,30(2):16-20(in Chi-nese).
[12]郭丽峰,张国雄,郭敬滨,等.基于虚拟仪器的电梯导轨多参数测量系统[J].天津大学学报,2005,38(4):347-351.Guo Lifeng,Zhang Guoxiong,Guo Jingbin,et al.Virtual instrument based multi-parameter measuring system for elevator rails[J].Journal of Tianjin University,2005,38(4):347-351(in Chinese).
[13]Yu S H,Avinash G,Thomas R W,et al.Physically based method for automatic mine detection using acoustic data:A transmission zero approach[C]//Detection and Remediation Technologies for Mines and Minelike Tar-gets VII,Proceedings of SPIE 4742.Orlando:Interna-tional Society for Optical Engineering,2002:701-708.
[14]Zagrai A,Donskoy D,Ekimov A.Resonance vibrations of buried landmines[C]//Detection and Remediation Technologies for Mines and Minelike Targets IX,Proceedings of SPIE 5415.Bellingham:International So-ciety for Optical Engineering,2004:21-29.
[2]Xiang N,Sabatier J M.Land mine detection measure-ments using acoustic-to-seismic coupling[C]//Detec-tion and Remediation Technologies for Mines and Mine-like Targets V,Proc SPIE 4038.Orlando:International Society for Optical Engineering,2000:645-655.
[3]Donskoy D,Ekimov A,Sedunov N,et al.Nonlinear seismo-acoustic land mine detection and discrimination[J].Journal of the Acoustical Society of America,2002,111:2705-2714.
[4]Scott W R,Martin J S,Larson G.Experimental model for a seismic landmine detection system[J].IEEE Trans Geosci Remote Sens,2001,39:1155-1164.
[5]Sabatier J M,Bass H E,Bolen L N.Acoustically induced seismic waves[J].Journal of the Acoustical Society of America,1986,80(2):646-649.
[6]Biot M A.Theory of propagation of elastic waves in a fluid-saturated porous solid(I):Low-frequency range[J].Journal of the Acoustical Society of America,1956,28(2):168-178.
[7]Biot M A.Theory of propagation of elastic waves in a fluid-saturated porous solid(Ⅱ):Higher-frequency range[J].Journal of the Acoustical Society of America,1956,28(2):179-191.
[8]Hickey C J,Sabatier J M.Measurements of two types of dilatational waves in an air-filled unconsolidated sand[J].Journal of the Acoustical Society of America,1997,102:128-136.
[9]Bass H E,Sabatier J M.Acoustic to seismic coupling and physical measurements[C]//Detection and Remedia-tion Technologies for Mines and Minelike Targets V,Proceedings of SPIE 4038.Orlando:International Soci-ety for Optical Engineering,2000:604-609.
[10]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 wave equation and wavefield simulation in two-phase anisot-ropic media[J].Chinese J Geophys,2002,45(4):575-583(in Chinese).
[11]裴正林.三维双相各向异性介质弹性波方程交错网格高阶有限差分法模拟[J].中国石油大学学报:自然科学版,2006,30(2):16-20.Pei Zhenglin.A staggered-grid high-order finite differ-ence method for modeling elastic wave equation in 3-D dual-phase anisotropic media[J].Journal of China University of Petroleum,2006,30(2):16-20(in Chi-nese).
[12]郭丽峰,张国雄,郭敬滨,等.基于虚拟仪器的电梯导轨多参数测量系统[J].天津大学学报,2005,38(4):347-351.Guo Lifeng,Zhang Guoxiong,Guo Jingbin,et al.Virtual instrument based multi-parameter measuring system for elevator rails[J].Journal of Tianjin University,2005,38(4):347-351(in Chinese).
[13]Yu S H,Avinash G,Thomas R W,et al.Physically based method for automatic mine detection using acoustic data:A transmission zero approach[C]//Detection and Remediation Technologies for Mines and Minelike Tar-gets VII,Proceedings of SPIE 4742.Orlando:Interna-tional Society for Optical Engineering,2002:701-708.
[14]Zagrai A,Donskoy D,Ekimov A.Resonance vibrations of buried landmines[C]//Detection and Remediation Technologies for Mines and Minelike Targets IX,Proceedings of SPIE 5415.Bellingham:International So-ciety for Optical Engineering,2004:21-29.
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