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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16 Sep 2005
TL;DR: In this paper, an experimental investigation of regular trends of acoustic waves propagation and glancing reflections in the XY plane of a single crystal was conducted. And the results were in good agreement with the predictions of theory related to the magnitudes of the phase and group velocities of ultrasound as well as to the acoustic energy walkoff angles in the crystal.
Abstract: This paper is devoted to experimental investigation of regular trends of acoustic waves propagation and glancing reflections in XY plane of TeO 2 single crystal. The unusual backward reflection of the acoustic waves from a side border of the crystal when the phase velocity of sound is directed along the border has been observed. All experimental results were in good agreement with the predictions of theory, related to the magnitudes of the phase and group velocities of ultrasound as well as to the acoustic energy walkoff angles in the crystal. Keywords: acoustic anisotropy, backward reflection, acousto-optical interaction geometry, quasicollinear filter, paratellurite INTRODUCTION It is known that acousto-optical devices have found wide application in Optics and Technology, e.g. in telecommunication systems, spectral image filtration, as well as in objects detection and recognition systems, structure visualization, etc 3 . The progress in modern Acousto-Optics stimulated the development of new types of the acousto-optical devices such as optimized acousto-optical tunable filters
5 citations
5 citations
TL;DR: Analysis of analyses of an interferometer with 95.5% reflectivity mirrors now indicate that a surface wave power density of 0.028 mW/mm is required to diffract 1% of transmitted light into the first order beam.
Abstract: It has been demonstrated that surface waves propagating on one mirror of an interferometer form an optical diffraction grating. Experimentally confirmed analyses of an interferomet er with 95.5% reflectivity mirrors now indicate that a surface wave power density of 0.028 mW/mm.MHz is required to diffract 1% of transmitted light into the first order beam. This power can be diminished by a factor of more than 20 by increasing the mirror reflectivity to 99%.
5 citations
Patent•
26 Apr 2000
TL;DR: In this paper, the ultrasonic wave propagation along the wall of a pipe is considered and the wall thickness of the pipe is set in a limited thickness, such that the acoustic velocity of ultrasonic waves which are transmitted in a material for the pipe can be made small.
Abstract: PROBLEM TO BE SOLVED: To provide a technique by which a flow rate can be measured with good efficiency even in a single path when the flow rate inside a pipe is measured, to provide a technique by which the flow rate can be measured without increasing the number of paths which are changed into a multipath and to provide a technique by which ultrasonic waves propagated along the wall of the pipe are detected or canceled without improving the pipe itself. SOLUTION: As compared with the acoustic velocity of ultrasonic waves from a transmitting sensor which is provided with a piezoelectric element used to generate the ultrasonic waves and which can be attached to the pipe, the acoustic velocity of ultrasonic waves which are transmitted in a material for the pipe is made small. The ultrasonic waves are detected in a position decided by Snell's law. When the ultrasonic waves are totally reflected, plate waves are used. The wall thickness of the pipe is set in a limited thickness. The ultrasonic waves which excite the plate waves along the wall of the pipe are passed through an average flow velocity path, and the flow rate is measured.
5 citations