Fig. 1. Laser induced acoustic telemetry model

Fig. 2. Relationship between extinction length of water and sound wavelength

Fig. 3. The sound field directivity model of LIA

Fig. 4. [in Chinese]

Fig. 4. Schematic diagram of the experimental device. (a) Laser-based ultrasonic system; (b) Signal acquisition and processing equipment

Fig. 5. Schematic diagram of experimental device

Fig. 6. Record diagram of experimental process

Fig. 7. Three-dimensional diagram of the experimental process

Fig. 8. Signal peak 3D imaging curved surface

Fig. 9. A, B and C receive the laser pulse signal waveform

Fig. 10. Spectrum of laser-induced acoustic signal

Fig. 11. Diagram of signal drift of A-D and A-E with sound distance change. (a) A-D signal drift; (b) A-E signal drift

Fig. 12. Influence of water surface disturbance on LIA signals

Fig. 13. Finite element model of LIA

Fig. 14. Comparison of sound pressure signals received by the probe

Fig. 15. Sound pressure signals at laser excitation and reception