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理论分析了脉冲激光激发的流体-分层固体结构声场,在此基础上数值计算了流体-慢层快底固体和流体-快层慢底固体结构液-固界面Scholte波的频散特性与瞬态响应.数值结果显示,对于流体-慢层快底结构,Scholte界面波呈现出正常频散特性;而对于流体-快层慢底结构,Scholte波在较小的频厚积范围呈反常频散特性.理论瞬态信号也显示了同样的特性.采用脉冲激光激励,用水听器接收的方式进行了Scholte界面波的实验测量.实验测量和分析结果与理论结果有很好的一致性.此工作可为水浸检测条件下镀层与薄膜材料参数的超声无损表征、海底沉积物参数反演等应用提供理论基础.
The fluid-stratified solid structure acoustic field excited by pulsed laser is analyzed theoretically. Based on this, the frequency dispersion characteristics of liquid-solid interface Scholte wave of fluid-slow solid and solid-liquid slow solid structure are calculated numerically. State response. The numerical results show that the Scholte interface wave exhibits a normal dispersion characteristic for the fluid-slow-layer fast bottom structure, while for the slow-bottom fluid-fast layer structure, the Scholte wave is anomalously dispersed Characteristics of the theoretical transient signal also shows the same characteristics.Using pulsed laser excitation, the hydrophone received Scholte interface wave experimental measurements.Experimental measurement and analysis of the results and the theoretical results are in good agreement.This work It provides a theoretical basis for the application of ultrasonic non-destructive characterization of the parameters of the coating and the thin film under water immersion conditions and the inversion of seafloor sediment parameters.