scispace - formally typeset
Search or ask a question
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
More filters
Journal ArticleDOI
TL;DR: In this article, a train of plane waves travels in an elastic semi-infinite medium bounded by a corrugated line having a sinusoidal shape, and the question arises of determining the effect of roughness of the boundary on the shape and amplitude of the reflected waves.
Abstract: A train of plane waves travels in an elastic semi-infinite medium bounded by a corrugated line having a sinusoidal shape. When the primary waves impinge against the surface, a new train of reflected waves is generated, and the question arises of determining the effect of roughnesses of the boundary on the shape and amplitude of the reflected waves.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a time-frequency method is developed to classify the wave speed of direct and reflective waves, respectively, in a long duct with large diameter, which induces a degree of error for leak detection.
Abstract: Gas leakage is often caused by the mechanical impact forces of construction equipment. In a long duct with large diameter, acoustic waves caused by the impact force are transferred to a far distance through the medium inside the duct. This wave is very complex since it includes an acoustic wave and solid wave. In general, the solid wave is attenuated faster than the acoustic wave in a buried duct because it is damped out by the soil covering the duct. The acoustic wave is propagated to the far distance with direct and reflective waves on the wall. The directive wave is non-dispersive and the reflected waves are dispersive due to the cavity modes of the duct. The typical correlation method has used both dispersive and non-dispersive waves to estimate the arrival time delay. Thus this method induces a degree of error for leak detection. In this article, time-frequency method is developed to classify the wave speed of direct waves (non-dispersive waves) and the reflective waves (dispersive waves), respective...

2 citations

Journal ArticleDOI
TL;DR: In this paper, it was demonstrated experimentally that the acoustic transient detected at a certain distance from the negative glow of a pulsed electrical discharge is superposition of a direct pulse and a pulse that has been reflected from the cathode surface.
Abstract: Electroacoustic resonances excited in a cylindrical plasma tube are very sensitive to minute changes in electron density and temperature and can therefore be used to detect sound waves. The principle of detection is that in the ordinary acoustic mode, the neutral particles, electrons, and ions move in phase with the same relative density changes. It is demonstrated experimentally that the acoustic transient detected at a certain distance from the negative glow of a pulsed electrical discharge is superposition of a direct pulse and a pulse that has been reflected from the cathode surface. From the perturbations of the electroacoustic resonances, relative density changes of the order of 1% in the acoustic transient are deduced.

2 citations

Journal ArticleDOI
TL;DR: In this article, the sound velocity in slightly ionized gases has been measured at gas pressures of about 1 mm Hg and at frequencies between 10 and 100 kc/sec.
Abstract: Measurements of the sound velocity in slightly ionized gases have been performed at gas pressures of about 1 mm Hg and at frequencies between 10 and 100 kc/sec. Ionization of the gas is effected by a dc discharge, the degree of ionization being of the order of 10−6 electrons and ions per molecule. The measurements have been taken with an acoustic interferometer, using electrostatic transducers with solid dielectric. The measurements show—besides an increase in the sound velocity which is due to a rise in temperature of the partially ionized gas—a dispersion of the sound velocity. This dispersion seems to be attributable to a resonance of the charged particles.

2 citations

Journal ArticleDOI
TL;DR: In this article, sound velocity and attenuation of non-uniformly quenched high carbon steel are presented by point source/point receiver technique with use of surface acoustic waves on frequency of 4.75 MHz.

2 citations


Network Information
Related Topics (5)
Wave propagation
55K papers, 1.1M citations
76% related
Scattering
152.3K papers, 3M citations
72% related
Magnetic field
167.5K papers, 2.3M citations
71% related
Electron
111.1K papers, 2.1M citations
71% related
Magnetization
107.8K papers, 1.9M citations
70% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433