The Processing of synchronous double pulse laser induced acoustic signal

Based on theoretical analysis and high-speed camera measurement experiment, this paper investigated the following subjects: laser-generated cavitation phenomenon and the interaction between two laser-generated bubbles. Double laser-generate bubbles measurement experiment platform was built. It can produce two bubbles in liquid at the same time by the Synchronization laser with spectroscopic focusing technology. Two bubbles' pulsation characteristics in the free field were studied by the theoretical analysis and experimental research. Experimental study found that by adjusting the pulse laser energy difference, you can control the laser sound signal peak interval, improve the laser sound signal pulse width. In the process of fusion of laser induced cavitation bubbles, the fusion phenomenon occurs. During the fusion process, the energy of the bubbles is transformed into mechanical energy. After the fusion, the energy of the individual cavities becomes larger and the frequency of the laser signal is reduced.