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Rapid measurement of ultrasonic velocity in a liquid

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A novel method for the determination of ultrasonic velocity in a liquid is described. A mask with a known length of aperture (measured in the direction of the ultrasonic beam) is placed in the path of a beam of parallel white light which traverses the liquid. A Debyesears diffraction pattern is produced by high frequency ultrasonic waves which have been amplitude-modulated at a lower frequency. If the central image of the diffraction pattern is blocked, and light collected by a lens from the higher order spectra, an alternating light intensity at the modulating frequency is obtained which may be measured by a photocellamplifier combination. It is shown theoretically that the modulating frequency corresponding to a minimum output of the photocell is related simply to the ultrasonic velocity, attenuation and length of mask aperture, and the expression obtained is confirmed experimentally by measurements on heptane. A measurement of ultrasonic velocity can rapidly be made, therefore, by simply tuning the modulating frequency to a minimum output from the photocell.
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Document Type: Research Article

Publication date: January 1, 1956

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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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