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Date of Publication:2022-10-10

Journal:声学学报

Volume:42

Issue:4

Page Number:457-464

ISSN No.:0371-0025

Abstract:The nonparaxial multi-Gaussian model can overcome the limitation of
   paraxial approximation and guarantee the efficiency of sound field
   simulation under the larger deflection angle. Based on the Rayleigh
   integral model in double media and the nonparaxial multi-Gaussian beam
   model in single medium, a nonparaxial multi-Gaussian beam model of a
   single rectangular array for shear wave detection is proposed. According
   to the delay time of each array for beam steering and focusing, a
   radiation beam field of ultrasonic linear phased array for shear wave
   detection based on a nonparaxial multi-Gaussian beam model is obtained
   through accumulation accordingly. Then this paper calculates the
   radiated sound field produced in the interrogated steel medium by a
   linear phased array transducer mounted on an acrylic wedge, and the
   comparative analysis between the proposed model and the paraxial
   multi-Gaussian beam model is performed to simulate the beam field with
   double interfaces. Simulation results show that the proposed model runs
   faster than the paraxial multi-Gaussian model, and it takes about 1/13
   time of the latter. In addition, comparison analysis results indicate
   that the proposed model can cover the bigger inspection area, has more
   concentrated energy, and is more suitable for the far field detection.

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