为了研究高能激光辐照诱导声波的频率特性以及实验条件对其的影响,采用宽频声传感器接收实验过程中产生的声波,并导入MATLAB中处理,得到其功率谱密度图。激光冲击实验采用铝箔吸收层、水以及不同约束状态下的K9玻璃约束层,对实验中产生声波的功率谱密度图做了详细分析,取得了图中最大峰值频率的分布数据。结果表明,不同约束层以及约束层的不同约束状态都会对声波功率谱密度最大峰值频率的分布有较大影响,而激光能量密度对其影响很小,同时该实验结果对激光冲击强化实现在线检测有重要指导意义。

In order to study the characteristics of the frequency of acoustic waves induced by high power laser,the acoustic waves were received by a wide band acoustic sensor.Then they were imported to MATLAB and calculated to obtain the power spectral density(PSD).After the analysis of the PSD of the acoustic waves induced by Nd:glass laser with water or K9 optical glass under different conditions as overlay,the frequencies at the maximum peak of the PSD were obtained.It is discovered that the frequencies are strongly influenced by different overlay or the overlay under different conditions,instead of the laser power density.The outcome provides important guiding significance to the realization of the on-line monitoring of the laser shock processing.