Propagation Characteristics of Oblique Incidence Air Coupling Ultrasonic Wave in Uniform Elastic Layered Medium

doi:10.3969/j.issn.1000-1093.2016.11.018

Abstract

Abstract: The propagation rules of air coupling acoustic wave in uniform elastic layered medium are studied at the different incident angles and testing frequency according to the wave equation. The transfer matrix method and the gas-solid boundary conditions of acoustic wave are used to solve the problem which lacks theoretical support in the application of non-contact ultrasonic test technology in uniform elastic material. A testing method of uniform elastic medium is developed. The stimulated results show that the transmission coefficient distribution presents a form of multimode. The total reflection occurs when the incident angle exceed the critical angle of transverse wave. The incident critical angle decreases with the increase in testing frequency. The cutoff frequency-thickness product increases with the increase in incident angle. The experimental results are in agreement with the numerical results.

Key words: materials examination and analysis, air coupling, wave equation, transmission coefficient, uniform elasticity, layered meduim

CLC Number:

TB553

WANG Xing-guo, WU Wen-lin, CHEN Zheng-lin, WU Nan-xing. Propagation Characteristics of Oblique Incidence Air Coupling Ultrasonic Wave in Uniform Elastic Layered Medium[J]. Acta Armamentarii, 2016, 37(11): 2094-2100.

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