Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
Papers published on a yearly basis
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15 Apr 1998
TL;DR: In this article, a strict solution of the Helmholtz's nonuniform equation in the form of the Green's function for two liquid media with an arbitrary geometry of the boundaries has been obtained.
Abstract: A strict solution of the Helmholtz's nonuniform equation in the form of the Green's function for two liquid media with an arbitrary geometry of the boundaries has been obtained. Examples of the calculation of the two- and three-element array, located in the confined space, bounded by the three finite impedance planes are cited. The decrease of the velocity of the refracted waves at the bottom-side half-space has been proved to take place when the incidence of the centrally symmetric waves (e.g. cylindrical and spherical waves) to the flat boundary of the two liquid media is under the angles greater than the critical ones.
Patent•
09 Jan 201327 Dec 1999
TL;DR: In this paper, the basic theory of acoustic wave propagation in crystals is reviewed and some of the implementations of the acoustic wave devices and how they can be employed in microwave systems are described.
Abstract: Acoustic wave devices are often used in radiofrequency and microwave circuits because of their very small size and the performance that they offer. In this article, we review the basic theory of acoustic wave propagation in crystals. We describe some of the implementations of acoustic wave devices and show how they can be employed in microwave systems. We then present some of the models that are commonly used in the design of acoustic wave devices.
Keywords:
bulk acoustic waves;
surface acoustic waves;
ultrasonics;
filters;
piezoelectricity
01 Sep 2014
TL;DR: In this paper, the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances was determined using a numerically efficient technique.
Abstract: We determine the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances. Using a numerically efficient technique, we are able to simulate large arrays. The results indicate the presence of resonances at low frequencies where Rayleigh-Bloch waves are excited on the surface of the array. Reflections from the edges cause standing-wave patterns. Above the cut-off frequency of Rayleigh-Bloch waves, no standing-wave pattern exists. However, there is nonuniformity among cell velocities mainly due to unequal radiation impedance seen by the cells. Rayleigh-Bloch waves and nonuniformity in cell velocities do not cause a significant degradation in the point spread function, but the oscillations extend the duration of impulse response, limiting the dynamic range.