激光自混合测振技术在声共振探雷实验中的应用  

Application of laser self-mixing vibration measurement technique in acoustic resonance landmine detection

作　　者：王驰[1,2] 马辉 李金辉[2] 张小青 栾信群 方东 WANG Chi;MA Hui;LI Jin-hui;ZHANG Xiao-qing;LUAN Xin-qun;FANG Dong(Department of Precision Mechanical Engineering,Shanghai University,Shanghai 200444,China;Science and Technology on Near-surface Detection Laboratory,Wuxi 214035,China)

机构地区：[1]上海大学精密机械工程系,上海200444 [2]近地面探测技术重点实验室,江苏无锡214035

出　　处：《光学精密工程》2021年第4期710-720,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.41704123,No.61773249);近地面探测技术重点实验室基金资助项目(No.TCGZ2020C003);上海市科技创新行动计划项目(No.20142200100)。

摘　　要：利用激光自混合干涉测振技术,研究一种非接触式声共振探雷方法。在论述激光自混合测振技术原理的基础上,以69式防坦克塑壳地雷、72式防坦克金属地雷、58式防步兵橡胶地雷和砖块作为测量对象,构建其声学特征测量实验系统,设计并搭建地雷在埋设情况下的探测实验系统,利用激光自混合测振技术研究不同类型埋设地雷及同一地雷在不同埋深和土壤条件下的声振特性。实验结果显示,地雷在外界激励下表现出独特的多模态振动特性,在不同埋设条件下表现出不同的声振特征,地表振动强度随着深度的增加和土壤孔隙度的减小而减小,而对土壤湿度的变化不明显。利用激光自混合测振技术可进行地雷振动特征的非接触式检测,埋设地雷的声振特征不同于砖块等干扰物,与地雷的类型及埋设条件有关。A non-contact acoustic resonance method for landmine detection was studied by a laser self-mixing interference vibration measurement technique. Based on the principle of the laser self-mixing vibration measurement technique,taking a type 69 anti-tank plastic landmine,a type 72 anti-tank metal landmine,and a type 58 anti-personnel rubber landmine and brick as testing targets,an experimental system was built to measure their acoustic characteristics. Experimental tests were conducted for a comparative analysis.An experimental system for detecting buried landmines was designed and built,and the laser self-mixing vibration measurement technique was used to study the acoustic vibration characteristics of different types of buried landmines and those of the same landmine under different buried depths and soil conditions. The experimental results show that landmines exhibit unique multi-modal vibration characteristics under external excitations. Buried landmines exhibit different acoustic vibration characteristics under different buried conditions. The vibration intensity increases with the increase of buried depth and decrease of soil porosity,thus is not sensitive to soil humidity. These results indicate that the laser self-mixing vibration measurement technique can be used for the non-contact detection of acoustic vibration characteristics of landmines. The acoustic vibration characteristics of buried landmines are different from other objects such as bricks and are related to the type of landmine and the buried conditions.

关 键 词：激光自混合干涉 声共振 地雷探测 声-地震耦合 

分 类 号：TN247[电子电信—物理电子学] TN249