Abstract
In order to understand the transmission properties of laser-induced acoustic in liquid, the transmission properties of laser-induced acoustic were analyzed theoretically, and the experimental research on the laser-induced acoustic was carried out by using high speed camera and fiber MEMS hydrophone. Wavelet transform was used to analyze the spectrum characteristics of the laser-induced acoustic signals at different locations. The results show that the laser-induced acoustic is a pulsating source, amplitude and distance are inversely proportional in the process of laser acoustic signal transmission; laser acoustic analysis of band memory has obvious dominant frequency, with peak frequency stability of 3.1 kHz and bandwidth stability of 3 kHz; low frequency signal energy accounted for more than 70% of the total energy, high frequency part is mainly noise; from the power spectrum waveform analysis, low frequency signal amplitude with time and distance attenuation is slower, and high frequency noise with time and distance transform decays faster.
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