激光致声探测水下目标分析  

Underwater detection and analysis with laser-acoustic method

作　　者：曹博文 龚杭 汲壮 严一民[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054

出　　处：《实验技术与管理》2014年第6期73-75,80,共4页Experimental Technology and Management

基　　金：电子科技大学大学生创新创业训练项目基金资助

摘　　要：针对激光热膨胀致声,研究声波的接收信号及特性。分析了微音器接收端声波信号的产生原因是水底反射波和水面反射波,但是由于受实验条件限制没能分辨出这两种声波信号区别,对这一问题有待继续探究。结合实验现象,利用Matlab分析微音器接收声波信号的时间差与水深相互关系,并得出一组声波传播时间与距离和声波速度在两种介质的折射关系表达式。通过仿真可以在理论上对探测水深进行计算。When a beam of strong laser is projected on the surface of water ,sound wave will be generated ,which will be reflected by the target under water .Thus the sound wave carries information of the target ,which can be used to detection .This paper describes the characters of sound wave generated by thermoelastic mechanism and analyses the two parts of the signals coming from the bottom of water and water surface .However ,due to the equipment’s defects ,the experiment does not succeed into distinguishing them .With the outcome of the experiment ,Matlab is also used to imitate the internal link of water ’s depth and the time audio monitoring receiver .Additionally ,this paper offers equations which can lead to the exact depth of water in this experiment ,with which ,Matlab can give a theoretical result .

关 键 词：探测水深 激光热膨胀致声 声波 微音器 

分 类 号：TN249[电子电信—物理电子学] P229.1[天文地球—大地测量学与测量工程]