Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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TL;DR: In this article, the Fraunhofer diffraction method was applied to the measurement of acoustic waves with a long wavelength, where the diffracted optical waves propagate in the penetrating optical beam and cannot be measured because of the disturbance by the latter.
Abstract: The conventional light diffraction method cannot be applied to the measurement of the acoustic waves with a long wavelength, where the diffracted optical waves propagate in the penetrating optical beam and cannot be measured because of the disturbance by the latter. In this study, the Fraunhofer diffraction method, which was developed as a new means to detect the electromagnetic radiation scattered within the penetrating light beam in the plasma‐nuclear fusion research, is applied to the measurement of acoustic waves. It is experimentally demonstrated that the acoustic wave with a wavelength longer than 8.5 mm can be detected by a visible laser of 5 mW, and the amplitude of the electrical output signal from a photodiode is linearly proportional to the sound pressure and the probe laser power, as predicted by the theory. The frequency property and directivity of the optical sound‐antenna are roughly estimated by the preliminary experiment. Furthermore, the Optophone (the optical microphone) of various type...
8 citations
TL;DR: The results show that when a short pulse is transmitted the waves of frequencies within the localization regime will be trapped in the system and reveal a coherent behavior.
Abstract: Acoustic pulse propagation in bubbly water is studied using a self-consistent method. The acoustic transmission and backscattering are evaluated numerically. Under proper conditions, the localization of acoustic waves is identified within a range of frequency. The results show that when a short pulse is transmitted the waves of frequencies within the localization regime will be trapped in the system and reveal a coherent behavior. A phase diagram approach is used to describe the localization behavior.
8 citations
TL;DR: In this paper, various ways of determining the acoustic impedance and the absorption coefficient of porous materials from measurements on the standing waves in tubes are discussed, where the material under investigation is placed at one end of the tube and the sound is introduced at the other end.
Abstract: Various ways of determining the acoustic impedance and the absorption coefficient of porous materials from measurements on the standing waves in tubes are discussed. In all cases the material under investigation is placed at one end of the tube and the sound is introduced at the other end. Values of the coefficient of absorption of a number of commonly used damping materials as obtained by one of the methods are given. Several types of built-up structures are shown to have a greater absorption coefficient for low frequency sound waves than is conveniently obtainable by a single layer of material.
8 citations
TL;DR: In this paper, the directions of particle motion associated with acoustic waves have been computed and displayed graphically, for each of the three waves, as a function of propagation direction, for cubic nickel and the maximum polarization angle found is 11½ degrees.
Abstract: The directions of particle motion associated with acoustic waves have been computed and are displayed graphically, for each of the three waves, as a function of propagation direction. The numerical example used is cubic nickel and the maximum polarization angle found is 11½ degrees.
8 citations
TL;DR: In this article, the authors calculated the acoustic power flow in a LiNbO3 single crystal to find the optimal crystal cutting orientation and the wave propagation direction for the efficient excitation of acoustic waves in the crystal.
Abstract: Acoustic power flow in a LiNbO3 single crystal was calculated to find the optimal crystal cutting orientation and the wave propagation direction for the efficient excitation of acoustic waves in the crystal. By solving the stiffened Christoffel equations and calculating the acoustic Poynting vectors with piezoelectric effect included, maximum longitudinal acoustic power flow in a 30° Z‐rotated, Y‐cut LiNbO3 crystal was found.
8 citations