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Acousto-Optical Sound Pulse Analysis under Raman-Nath Conditions and Beyond

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The acousto-optical interaction of a plane monochromatic light wave with a plane sound pulse, consisting of a continuous frequency spectrum, is considered. A new integro-differential equation, describing the phenomenon, is derived. This equation is firstly solved in the Raman-Nath regime. A general expression for the intensity in the optical near field (Fresnel zone) is given. For the case of a weak sound field and close to the sound column, it is shown that the light intensity, as a function of time, is proportional to the second derivative of the sound pulse signal. Secondly this equation is solved beyond the Raman-Nath regime. The obtained expressions can be very useful for optical near field measurements of sound pulses with a discrete or continuous spectrum, that consists out of higher frequencies than in the restricted Raman-Nath case.
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Document Type: Research Article

Publication date: March 1, 2001

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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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