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Signal Loss of Reflected and Transmitted Ultrasonic Waves Induced by Double Rough Interfaces

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A simple analytical model evaluating the signal loss of reflected and transmitted ultrasonic waves induced by double random rough interfaces was presented based on the Phase-Screen approximation (PSA). By expressing the phase correlation factor of the acoustic beam doubly transmitting through rough interfaces into the function of the flaw depth and the incident angle, the model overcomes some limitations and inadequacy subjected by those models which use only the phase-screen approximation to evaluate the signal loss of waves induced by the single rough interface. The signal attenuation will decrease with the increase of the beamŠs incident angle for the flaw near the upper interface, while the signal attenuation is not sensitive to the incident angle, as the flaw is far from the upper interface. The results indicate that the influence of the angle factor for the waves doubly transmitted through the rough interface on the phase correlation will only operate near the upper interface. The experimental results show that the theoretical prediction is in good agreement with experimental measurements. Therefore, the model proposed in the paper is suitable for the real-time ultrasonic non-destructive testing of rough flaws under the rough surfaces in materials.
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Document Type: Research Article

Publication date: September 1, 2010

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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