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In-Plane Laser-Doppler-Velocimeter Sensor Head for the Measurement of Surface Structural Intensity

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The existing theory regarding the acoustic Poynting vector in the free surface of a structure, which up to now has only been established for the case of isotropic structures, is generalized to non-isotropic structures. It is shown that, in this general case, the measurement of the acoustic Poynting vector in the surface can be reduced to a measurement of the three in-plane strain and the two in-plane velocity components. Based on this formulation, a sensor head concept for the determination of the acoustic Poynting vector, using multi-point optical in-plane displacement measurement is presented. The concept is studied experimentally for a simple case of one-dimensional structural vibration. Experimental results obtained with a sensor head designed for one-dimensional acoustic energy flow are presented, demonstrating the feasibility of the technique.
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Document Type: Research Article

Publication date: November 1, 1998

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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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