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, steady state analysis using phasors and the Smith Chart is applied to plane electromagnetic and acoustic waves at all angles of incidence, as well as to the transmission line, and the analogies between the "telegraphers' equations" and comparable equations describing nonelectrical phenomena are stressed.
Abstract: Traveling waves must be considered whenever the time for a disturbance to propagate from one place to another is important. A course with this as its theme has been developed to replace the usual course in transmission lines or distributed constant circuits. Emphasis is placed on the transmission line as a teaching vehicle, but plane waves in space; vibrating strings and membranes; acoustic waves in gases, liquids and solids; heat conduction; and chemical diffusion are also treated. The analogies between the "telegraphers' equations" and comparable equations describing nonelectrical phenomena are stressed. Transients are treated for two special cases: 1) lossless lines and acoustics, and 2) diffusion and heat transfer. Steady state analysis using phasors and the Smith Chart is applied to plane electromagnetic and acoustic waves at all angles of incidence, as well as to the transmission line. Spherical acoustic waves are treated briefly.
1 citations
Journal Article•
1 citations
TL;DR: In this article, the generation of down-converted frequency waves in the nonlinear propagation of acoustic waves is examined, in order to investigate the effects produced by the finiteness of the medium or of the media of interaction.
Abstract: The generation of down-converted frequency waves in the nonlinear propagation of acoustic waves is examined, in order to investigate the effects produced by the finiteness of the medium or of the media of interaction. Oscillations of the directivity patternsvs. the width of the media of interaction are set in evidence and related to resonance conditions of the medium cavity.
1 citations
01 Jan 1983
TL;DR: In this article, a theoretical model is proposed which permits to evaluate surface acoustic wave (SAW) velocity in presence of a uniform electric field under the simplifying assumption of small amplitude acoustic waves.
Abstract: The propagation velocity of surface acoustic waves in piezoelectric materials is affected by the presence of a bias electric field. This effect can be theoretically described by introducing into the constitutive piezoelectric equations non linear terms involving second and higher order constants of the material. In the present paper , a theoretical model is proposed which permits to evaluate surface acoustic wave (SAW) velocity in presence of a uniform electric field under the simplifying assumption of small amplitude acoustic waves. The dependence of the surface acoustic wave velocity on the strenght of the applied electric field has been calculated for surface acoustic waves propagating along Z direction of a Ycut LiNbO crystal under an electric field applied along Y direction. Theoretical values of the fractional velocity changes versus applied electric field are reported and compared with experimental results. 3
1 citations
1 citations