掩埋物对声-地震耦合效率的影响

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一地震耦合效率，声共振探雷模型具有较强的地雷鉴别能力．

Impact of Buried Objects on Acoustic-to-Seismic Coupling Efficiency

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.