The work presented in this paper focuses on a novel method that is laser-induced ultrasonic (LIU) imaging detection based on interferometric synthetic aperture focusing technology (InSAFT). The approach adopted is combing interferometry technology with synthetic aperture focusing technology (SAFT). A set of numerical simulations to test the validity of LIUInSAFT imaging detection were performed by the finite element method (FEM). The results of the simulation indicate that the height of target determined by LIU-InSAFT agrees well with that of setting value in the mode of simulation. All the preliminary results throw light on the nature of LIU-InSAFT applied to height detection or inner roughness of inner surface in materials.
Laser-induced acoustic (LIA) technology is of significance for the communication from the air platform to the
underwater platform. This paper describes a method of nonlinear LIA in the liquid based on the mechanism of optical
breakdown. Acoustic signals with high energy were generated by using a Nd: YAG pulsed laser with 10 ns width. A PZT
hydrophone was used to receive the LIA signals for cases of the linear and nonlinear regime in the water. Meanwhile,
simulation of LIA in a distance of 400 m between laser spot on the water surface and the hydrophone was performed by
the COMSOL Multiphysic software. The simulated results show the communicated ability of LIA technology in the long
distance.
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