In this study, a laser ultrasonic technology (LUT) was employed for seismic physical model (SPM) imaging. To promote an efficient light-to-ultrasonic-wave conversion, a functionalised Au film was used as a medium because of its stronger photoacoustic (PA) effect. Numerical analysis and experiments were performed to characterise the entire SPM imaging process, including the generation of PA signals, transmission of PA inside the SPM, and collection of echo data for the reconstruction of SPM images using the time-of-flight algorithm. The results show that the Au film coating on the SPM produces a strong PA effect, which significantly improves the imaging depth and resolution of the SPM based on the strong high-frequency ultrasonic wave excitation. The proposed method opens new avenues for SPM imaging using optical technology.

在这项研究中，采用激光超声技术（LUT）进行地震物理模型（SPM）成像。为了促进有效的光到超声波转换，功能化的金膜由于其较强的光声（PA）效应而被用作介质。进行了数值分析和实验，以表征整个SPM成像过程，包括PA信号的生成，SPM内PA的传输以及使用飞行时间算法重建SPM图像的回波数据的收集。结果表明，基于强高频超声激发，在SPM上的Au膜涂层产生了很强的PA效应，从而显着提高了SPM的成像深度和分辨率。所提出的方法为使用光学技术进行SPM成像开辟了新途径。