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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Patent•
02 Jul 1986TL;DR: In this paper, a non-collinear acousto-optic tunable filter crystal has a first transducer bonded to one transducers face of the crystal and a single transducers bonded on the opposite face which is cut so as to be parallel to the first transducers.
Abstract: An acousto-optic tunable filter configuration and a method for the operation thereof, whereby the tuning range is extended. A non-collinear acousto-optic tunable filter crystal has a first transducer bonded to one transducer face of the crystal and a single transducer bonded on the opposite crystal face which crystal face is cut so as to be parallel to the first transducer. The first transducer operates at a center frequency f1 and the second transducer operates at a center frequency f2. By launching acoustic waves having a center frequency f1 into the crystal from the crystal's first side acoustic waves propagate in a first direction such that the interaction of the acoustic wave with the light results in the absorption of a phonon. Acoustic waves having a center frequency f2 are launched into the crystal from the crystal's second side and propagate in a second direction which is anti-parallel to the first direction such that the interaction with the light by the second series of acoustic waves results in the stimulated emission of a phonon.
14 citations
Patent•
28 Sep 1982
TL;DR: In this paper, a two-armed interferometer terminating by a photorefractive medium was used as an interactive reflector according to the four-wave interferometers principle.
Abstract: The invention relates to the interferometric detection of reciprocal and non-reciprocal effects affecting the propagation of optical radiation in a two-armed interferometer. The invention relates to a two-armed interferometer terminating by a photorefractive medium used as an interactive reflector according to the four-wave interferometer principle. The invention particularly applies to the measurement of physical quantities such as displacement, linear velocity, angular velocity, magnetic field, pressure and temperature.
14 citations
Proceedings Article•
01 Sep 2008
TL;DR: In this article, the authors compare the two methods for measuring the sound absorption coefficient, the method that uses the standing wave ratio and the transfer function method, on several different materials.
Abstract: The goal of this paper is to compare the two methods for measuring the sound absorption coefficient, the method that uses the standing wave ratio and the transfer function method, on several different materials. For this purpose, an impedance tube for the transfer-function method was designed and constructed. Measurements were made on mineral wool and foam of different thickness. At the end, measurement results for sound absorption coefficient for each material are shown and compared for two tubes.
14 citations
14 citations
TL;DR: In this article, the authors investigated the X-ray diffraction is determined by the amplitude and the wavelength of the surface acoustic waves of a LiNbO/sub 3/ crystal modulated by surface acoustic wave.
Abstract: Space-time modulation of an X-ray beam is investigated by total external reflection on a YZ-cut of a LiNbO/sub 3/ crystal modulated by surface acoustic waves. It is shown that the X-ray diffraction is determined by the amplitude and the wavelength of the surface acoustic waves. Both experimental and theoretical studies have revealed the possibility of fabricating X-ray optical elements based on space-time modulation by controlling the wavelength and the pulse modulation of the surface acoustic waves. These experiments were carried out at CNRS (Grenoble, France) using a rotating copper anode. >
14 citations