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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01 Mar 1992
TL;DR: In this article, an algorithm based on the application of transmission line theory to the propagation of both acoustic and electromagnetic waves in isotropic media having arbitrary velocity and impedance profiles is presented to calculate the space evolution of the reflection coefficient.
Abstract: An algorithm based on the application of transmission line theory to the propagation of both acoustic and electromagnetic waves in isotropic media having arbitrary velocity and impedance profiles is presented to calculate the space evolution of the reflection coefficient. Several cases will be presented to demonstrate the validity of the algorithm.
2 citations
25 Sep 1975
TL;DR: In this paper, a theoretical and experimental study of acoustic propagation in an anechoically terminated multisectioned duct was performed, where a unique source array consisting of two concentric rings of sources, providing phase and amplitude control in the radial as well as circumferential direction, was developed to generate plane waves and both spinning and non-spinning higher order modes.
Abstract: A theoretical and experimental study of acoustic propagation in an anechoically terminated multisectioned duct was performed A unique source array consisting of two concentric rings of sources, providing phase and amplitude control in the radial as well as circumferential direction, was developed to generate plane waves and both spinning and non-spinning higher order modes Measurement of attenuation and radial mode shapes were taken with various finite length liners inserted between the hard wall sections of a duct with an anechoic termination A search technique was developed to find the complex eigenvalues for a liner under the assumption of a locally reacting boundary condition The experimental results were compared with a theoretical analysis which includes the modal transmission and reflection at the interface of each duct section, and this indicated that the local reaction boundary condition is valid for three liner configurations
2 citations
TL;DR: Time‐delay interferometry suitable for measuring short SAW pulses is demonstrated and the effects of varying the path difference of the interferometer and the measurement position on the surface are discussed.
2 citations
Patent•
29 Sep 1982
TL;DR: In this paper, a ring interferometer with a ring-shaped waveguide was used for measuring the flow of a fluid, where two radiant energy waves circulate in opposite directions, means (M, M') for separating and mixing these waves and means (D, D') for detecting interference of these waves which are sensitive to their phase difference.
Abstract: The device comprises a ring interferometer. This ring interferometer has a ring-shaped waveguide (2), in which two radiant-energy waves circulate in opposite directions, means (M, M') for separating and mixing these waves and means (D, D') for detecting the interference of these waves which are sensitive to their phase difference. These radiant-energy waves pass through the fluid flow, the characteristics of movement of which at an angle (-) different from pi /2 are to be ascertained. The invention is used for measuring the flow of a fluid.
2 citations
07 Nov 2002
TL;DR: In this article, the authors measured the phase-delay of a shear horizontal (SH) wave device with various liquid-crystal director orientations, which is affected by the liquid crystal director orientation.
Abstract: The director-orientation of a liquid crystal near an interface between a glass plate and a liquid-crystal layer is studied under propagation of a shear horizontal (SH) acoustic wave. An acoustic phase-delay of a SH wave device with various liquid-crystal director orientations, which is affected by the liquid-crystal director orientation, is measured. The fractional velocity change of the SH wave is related to the liquid-crystal director orientation by numerical analysis. The dependence of the phase-delay on the applied voltage to the liquid-crystal layer is evaluated. The present technique is useful for evaluating the liquid-crystal director orientation without requiring a complicated experimental setup.
2 citations