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 paper, an apparatus for treating a patient with acoustic waves has a source of acoustic waves and an X-ray locating system, which includes an Xray radiator and a radiation detector, mounted opposite each other on a C-arm.
Abstract: An apparatus for treating a patient with acoustic waves has a source of acoustic waves and an X-ray locating system, which includes an X-ray radiator and a radiation detector, which are mounted opposite each other on a C-arm. The C-arm is adjustable along its outer circumference around its central axis. The source of acoustic waves is adjustable along the inner circumference of the C-arm such that the acoustic axis of the acoustic wave source constantly intersects the central axis of the C-arm.
25 citations
TL;DR: In this paper, the Scholte-Stoneley wave (SSW) was shown to display directional gaps and band folding in fluid-loaded solid phononic plates, where the plates were inhomogeneously patterned with in-plane periodic modulations of the elastic constants, but present flat surfaces free of corrugations.
Abstract: Surface acoustic-wave phenomena span a wide range of length scales going from the devastation of earthquakes down to image reconstruction of buried nanostructures. In solid-fluid systems, the so-called Scholte-Stoneley waves (SSWs) dominate the scene at the interface with their evanescent fields decaying away into both media. Understanding and manipulating these waves in patterned surfaces would enable new applications of sound to be devised for imaging and acoustic signal processing, although this task has so far remained elusive. Here, we report SSW modes displaying directional gaps and band folding in fluid-loaded solid phononic plates. The plates are inhomogeneously patterned with in-plane periodic modulations of the elastic constants, but present flat surfaces free of corrugations. We experimentally demonstrate control of SSWs, which opens a promising route toward acoustic fluid sensing, microscopy, and signal processing.
25 citations
TL;DR: In this paper, a simple method for generating standing capillary waves of known frequency on water and introduce a novel noncontact technique based on laser interferometry to measure the wavelength of capillary wave with great precision.
Abstract: Surface waves on fluids with wavelengths in the millimeter range are known as capillary waves. Surface tension determines the propagation and dispersion of capillary waves while gravity plays a minor role. We describe a simple method for generating standing capillary waves of known frequency on water and introduce a novel noncontact technique based on laser interferometry to measure the wavelength of capillary waves with great precision. The data gives the dispersion relation of capillary waves and provides an accurate method for determining the surface tension of fluids.
25 citations
TL;DR: In this paper, the propagation and reflection of bulk ultrasonic waves in a paratellurite crystal have been investigated by the acousto-optic method, and the results show that the energy of a quasi-longitudinal wave can be converted into a single reflected quasi-shear wave with a walkoff angle 72° for the reflection from a free crystal boundary.
Abstract: The propagation and reflection of bulk ultrasonic waves in a paratellurite crystal have been investigated by the acousto-optic method. Simultaneous excitation of two acoustic waves by one piezoelectric transducer has been observed in a cell of complex, specially chosen configuration. Maximally efficient conversion of the energy of a quasi-longitudinal wave into a single reflected quasi-shear wave with a walkoff angle 72° is implemented for the reflection from a free crystal boundary. The wave beam compression by a factor of 7 is observed for this reflection. A reflection (close to backward) of waves with an angle of spatial separation of the incident and reflected beams equal to 8° is also implemented. The acousto-optic figure of merit values of the medium are calculated for arbitrary propagation and polarization directions of the interacting light and ultrasonic waves. Possible applications of the effects studied in acousto-optics and acoustoelectronics are indicated.
25 citations
TL;DR: In this article, the phase shift in interferometry due to the space-time curvature is computed in nonrelativistic and relativistic physics, and experiments are proposed to detect the effect of the tidal forces of the Earth, Moon, and the Sun.
Abstract: The phase shift in interferometry due to the space-time curvature is computed in nonrelativistic and relativistic physics This treatment is applied to an interferometer analogous to the perfect crystal interferometer used in the Colella-Overhauser-Werner experiment with thermal neutrons, an interferometer consisting of only horizontal mirrors, suitable for ultracold neutrons, and optical interferometry Experiments are proposed to detect the effect of the tidal forces of the Earth, Moon, and the Sun, for the first time in interferometry The phase shift in neutron interferometry due to terrestrial objects is considered and an experiment is proposed with superfluid helium as the source of gravity This would provide, for the first time, direct evidence concerning the gravitational interaction between two quantum-mechanical states The possibility of detecting purely general-relativistic effects due to curvature, by means of neutron interferometry, is also explored
25 citations