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构建了激光声实验测量系统,利用脉冲激光聚焦击穿水介质产生声信号,由水听器将声信号转换成电信号并送入数字存储示波器。分析了激光声信号的时频域数学模型,通过实验对单个激光声信号的时频域特征进行了研究,对激光声通信的信号调制方式进行了理论分析和实验验证。研究结果表明:激光声信号的脉宽约为20μs,其能量主要集中在200 k Hz内,这其中100~200 k Hz内的能量占到的比例大约有50%,通过对激光声信号进行幅度调制和频率调制,可以有效实现激光声通信过程。
The experimental system of laser sound experiment was constructed. The pulsed laser was used to penetrate the water medium to generate the acoustic signal. The hydrophone converted the acoustic signal into electrical signal and sent it to the digital storage oscilloscope. The time-frequency domain mathematical model of laser acoustic signal is analyzed. The time-frequency characteristics of single laser acoustic signal are studied experimentally, and the signal modulation of laser acoustic communication is theoretically analyzed and verified by experiments. The results show that the pulse width of the laser acoustic signal is about 20μs and its energy is mainly concentrated within 200 kHz, of which the energy in the range of 100 ~ 200 k Hz accounts for about 50% of the total. The laser acoustic signal amplitude Modulation and frequency modulation, can effectively achieve the laser acoustic communication process.