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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。
As a new excitation method of underwater sound source, laser sound has the advantages of high intensity, narrow pulse, wide spectrum and long-distance excitation. In order to analyze the characteristics of laser penetrating liquid radiation and its application to underwater target detection, the far-field acoustic radiation model of laser sound is derived under the condition of single-point spherical source radiating sound waves. The laser acoustic experiment measurement system. The time-domain characteristics, spectral characteristics, correlation between laser acoustic signal and laser energy, and underwater transmission characteristics were measured by using a hydrophone. Laser acoustic signals were used in the anechoic pool Weak targets of the probe experiments, get the relevant characteristics of the laser acoustic signal law. The results of this study will help promote the underwater acoustic detection of underwater targets.