基于相对声-地震耦合率的声波探雷技术

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．

Technology for Acoustic Landmine Detection Based on Relative Acoustic-to-Seismic Coupling Ratio

In order to analyze the theoretical model for relative acoustic-to-seismic coupling ratio method to detect landmine, an experimental system for acoustic landmines detection was developed. First, according to acoustic-to-seismic coupling theory, an analytic method was adopted to study the resonance mechanism of soil-landmine system. Then a loudspeaker 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.