CAJ | 학술논문

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 kHz内，这其中100~200 kHz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。
구건료격광성실험측량계통，이용맥충격광취초격천수개질산생성신호，유수은기장성신호전환성전신호병송입수자존저시파기。분석료격광성신호적시빈역수학모형，통과실험대단개격광성신호적시빈역특정진행료연구，대격광성통신적신호조제방식진행료이론분석화실험험증。연구결과표명：격광성신호적맥관약위20μs，기능량주요집중재200 kHz내，저기중100~200 kHz내적능량점도적비례대약유50%，통과대격광성신호진행폭도조제화빈솔조제，가이유효실현격광성통신과정。
Experimental system for laser-induced acoustic signals was built. Acoustic signal was induced by pulsed laser focusing into water. A hydrophone was used to convert acoustic signals into electric signals. The mathematic model for laser-induced acoustic signals in time domain was analyzed. Energy distribution of laser-induced acoustic signals in frequency domain was studied. The modulation method for communication based on laser-induced acoustic signal was theoretically studied and proved by experiments. The results are as follows: Pulse width of laser-induced acoustic signal is about 20μs. The laser-induced acoustic signals have most of their energy concentrated within 200 kHz, where half of that is between 100 kHz and 200 kHz. Magnitude modulation and frequency modulation are effective methods in communication based on laser-induced acoustic signal.