摘要
激光声作为水下声源的一种新的激发方法,具有高声强、窄脉冲、宽频谱和可远距离激发等优点。为分析激光击穿液体辐射声波特性及应用于水下目标探测的性能,在光击穿形成单点球源辐射声波条件下,推导了激光声的远场声辐射模型,设计了激光声实验测量系统。采用测量水听器对激光击穿水激发的声波信号的时域特征、频谱特征、激光声信号与激光能量相关性、水下传输特性进行了测量,并在消声水池中利用激光声信号对弱小目标进行了探测实验,得到了激光声波信号的相关特性规律。研究结果有助于推动激光声探测水下目标的深入开展。
Laser-induced acoustic signal is a new approach for underwater acoustic source,which has much virtue such as high intensity,short pulse and broad frequency.The acoustic signal characteristic of laser-induced breakdown is studied and its corresponding theory model is systemically analyzed.The experimental measure investigation is formed with the high power laser,water tank and high frequency hydrophone.The characteristic of acoustic signal such as intensity,frequency and transmitting is analyzed.Based on the underwater target detection technology,the experiment of underwater target detection is done through laser-induced acoustic signal.The experimental results show that the laser-induced acoustic signal has a salience role during the small target detection.This makes a stride for investigation of laser-acoustic underwater objects detection.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第5期1332-1337,共6页
Chinese Journal of Lasers
基金
国防基金(9140A14060207JB11)资助课题
关键词
激光光学
激光声
目标探测
水下声源
laser optics
laser-induced acoustic
target detection
underwater acoustic source
