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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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Journal ArticleDOI
TL;DR: In this article, the interaction between two colinear longitudinal acoustical waves of frequencies 930 MHz and 2770 MHz simultaneously excited in LiNbO3 was studied.
Abstract: We have studied the interaction between two colinear longitudinal acoustical waves of frequencies 930 MHz and 2770 MHz simultaneously excited in LiNbO3 (cut 001). The acoustical waves were produced by placing a crystal in an intense electric field of a cavity resonating with two distinct frequencies. The waves thereby produced interact at the surface of the crystal (when the acoustical waves are produced) and in the volume when the waves are propagated, forming harmonies and waves of mixed frequencies mF1±nF2 (F1 and F2 are frequencies of the fundamental waves, m and n are integers). We have detected waves of frequencies 2F1 and F2 − F1 in the second end of the crystal. The deformation amplitudes detected at these frequencies depend on the length of the crystal studied. The interaction observed, along the direction [001] of LiNbO3, depends then on the interaction length between waves in the crystal and has been interpreted by considering only the nonlinear effects in the propagation of the acoustical waves.

2 citations

Journal ArticleDOI
TL;DR: In this article, the angular dependence of the electric field scattered by undamped or by damped acoustic waves is given by the product of the Laplace transform of the complex amplitude of the acoustic waves and that of the incident light waves.
Abstract: Optical Bragg reflection, when both acoustic and incident light waves have complex amplitude distributions, is treated mainly from theoretical point of view on the basis of the simplified integral method. As long as the scattered electric field is negligible compared with the incident electric field, the angular dependence of the electric field scattered by undamped or by damped acoustic waves is given by the product of the Laplace transform of the complex amplitude of the acoustic waves and that of the incident light waves. In the case of light scattering by undamped acoustic waves, these Laplace transforms are reduced to the directivity functions. Some explicit results of the angular dependence of the scattered electric field are given for the convenience of practical uses. A comparison between the theory and experiments is done for a simple case.

2 citations

Journal ArticleDOI
TL;DR: The dependence dLambda/dOmega>0 between wavelength and frequency is experimentally verified, as the required condition for acousto-optical diffraction, where higher frequency components would scatter light into smaller diffraction angles.
Abstract: Experimental evidence is given of acoustic plate waves, whose group velocity is contradirected with respect to the phase velocity, through a determination of the acoustic wavelength dependence on frequency, in a limited range of frequencies. The dependence dLambda/dOmega>0 between wavelength and frequency is experimentally verified, as the required condition for acousto-optical diffraction, where higher frequency components would scatter light into smaller diffraction angles.

2 citations

Proceedings ArticleDOI
01 Jan 1970
TL;DR: In this paper, an interferometer was designed that is capable of measuring the visibility of the interference fringes in the far field of an acoustic radiator, and amplitude fluctuations of the divided acoustic wavefront were analyzed utilizing correlation techniques.
Abstract: Measurements have been made showing the limitations a seawater medium imposes on the resolving power of underwater acoustic equipment An interferometer was designed that is capable of measuring the "visibility"' of the interference fringes in the far field of an acoustic radiator Phase and amplitude fluctuations of the divided acoustic wavefront are analyzed utilizing correlation techniques

1 citations

01 Mar 1969
TL;DR: In this article, an ultrasonic, pulse-echo technique was used to determine the velocities of sound waves propogating in a heated region of rod-shaped specimens.
Abstract: Ultrasonic method is used to determine the elastic moduli of materials used in components of high-temperature nuclear reactors. An ultrasonic, pulse-echo technique determines the velocity of sound waves propogating in a heated region of rod-shaped specimens. From these velocities, the elastic moduli are calculated.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433