液体性质与吸收能量对激光致声特性的影响
Influences of liquids properties and absorbed energy on laser induced expanding sound
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摘要: 建立了激光致声的产生和测量系统，对蒸馏水、酒精和甘油中的激光致声进行测量分析,分别计算了这3种透明液体在体积模量(0.2~7.0 GPa)、动力粘性系数(0.001~30.000 Pa·s)和所吸收激光脉冲能量(10~400 mJ)变化时对应的激光致声的相关数值。实验和数值计算结果表明：激光致声的主频、峰值声压和声能随着透明液体体积模量的增加而增加;激光致声的峰值声压和声能随着动力粘性系数的增加而减小,随着击穿区所吸收的激光脉冲能量的增加而增加;动力粘性系数和击穿区所吸收的激光脉冲能量对主频的影响不明显。Abstract: Influences of the transparent liquids’ bulk modulus, dynamic-viscosity coefficient and the absorbed laser pulse energy in the breakdown region on the peak pressure, the sound energy and the dominant frequency of the laser induced expanding sound are analyzed. An experimental system is developed for producing and measuring laser induced expanding sound in three transparent liquids-distilled water, alcohol and glycerin. The parameters of laser induced expanding sound are calculated within certain ranges of bulk modulus (0.2~7.0 GPa), dynamic-viscosity coefficient (0.001~30.000 Pa·s) and absorbed laser pulse energy (10~400 mJ). The results of theoretical calculation and experiment is as follows: Firstly, the dominant frequency, the peak sound pressure and the sound energy increase as the bu
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