WANG Chi XIE Yulai LI Xingfei SUN Fei ZHANG Guoxing

 (State Key Lab of Precision Measuring Technology and Instruments, Tianjin University  Tianjin 300072)

Received Mar. 12, 2008

Revised Mar. 25, 2008 

Abstract The mechanical interaction between the induced seismic waves and landmines was analyzed according to acoustic-to-seismic coupling theory. And a geophone array based experimental system for landmine detection was developed. By modeling a compliant mine and the soil on top of the mine as a mass-spring system, analytic method was adopted to study the resonance mechanism of the system. A loudspeaker was employed as energy source to excite a swept sine tone over the soil. We also used a geophone array to measure the vibration velocity of the ground surface. In order to analysis the landmine effect on the surface vibration, the magnitude spectra curves of the measured velocity values on-and-off mine were plotted. The results showed that the data measured on mine is much bigger than that off target and the proposed system can be applied to further investigation of acoustic landmines detection.

PACS numbers: 43.20, 43.40, 43.58