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, the main characteristics of a piezoelectric transducer mounted on an optical fiber and used to measure the acoustic signals induced by interaction between the radiation and the material are described.
Abstract: The main characteristics of a piezoelectric transducer mounted on an optical fiber and used to measure the acoustic signals induced by interaction between the radiation and the material are described. Results of an investigation of a laser-induced acoustic signal in a liquid are presented.
TL;DR: In this paper, the Lame coefficients (λ, μ) density (ρ) and thickness (h) of a zinc layer on a steel substrate were characterized based on fitting the measured velocity dispersion curve of surface acoustic waves (SAW) on a dispersion curves calculated using the conjugates gradients algorithm.
Abstract: Laser-ultrasonics and acoustic modeling were used to characterize the Lame coefficients (λ, μ) density (ρ) and thickness (h) of a zinc layer on a steel substrate. This characterization is based on fitting the measured velocity dispersion curve of surface acoustic waves (SAW) on a dispersion curve calculated using the conjugates gradients algorithm. The velocity dispersion curve of the Rayleigh wave was calculated in the frequency range of 1–200 MHz and measurements were achieved from 5 to 50 MHz.
19 Jun 2008
TL;DR: In this article, the effect of initial aperture of a beam at a frequency of 3 MHz on the frequency and spatio-temporal parameters of nonlinear acoustic waves propagated in pure degassed water is studied.
Abstract: The results of experimental studies of the effect of initial aperture of intense acoustic beams at a frequency of 3 MHz on the frequency and spatio‐temporal parameters of nonlinear acoustic waves propagated in pure degassed water are presented. The experiments were carried out in weakly diverging acoustic waves generated by piston‐like piezo‐ceramic radiators. A wideband miniature calibrated MHA9 receiver by Force Technology, capable of correctly analyzing over 20 harmonics of the received acoustic signal, was used in the experiments. The influence of initial aperture of the beam is studied on the spatial distributions of higher‐harmonic amplitudes in nonlinear waves formed at moderate values of the Reynolds number Re. The received‐signal profiles as functions of the reception point in the acoustic beam are analyzed for various relationships between the nonlinear and diffraction effects.
29 May 2001
TL;DR: In this article, the exact analytical solution of a problem on the radiation of acoustic waves by a spherical shell supported by a rigid cone and being in contact with acoustic media is obtained, where the exact solution of the problem is given.
Abstract: The exact analytical solution of a problem on the radiation of acoustic waves by a spherical shell supported by a rigid cone and being in contact with acoustic media is obtained.
TL;DR: In this article, a non-contact all-optical method for surface photoacoustic is described, where the surface acoustic waves were excited employing a ArF excimer laser in the 10 µm thin polyimide film and detected with a Michelson interferometer using 633 nm HeNe laser due to an active stabilization for interferometers.
Abstract: A non contact all-optical method for surface photoacoustic is described. The surface acoustic waves were excited employing a ArF excimer laser in the 10 µm thin polyimide film and detected with a Michelson interferometer using 633 nm HeNe laser due to an active stabilization for interferometer a surface displacement of 0.2 A. could be detected used for the purpose of discriminating between normal and maligned tissue. The acoustic waves propagate several millimeters in the sample differentiating maligned areas from normal breast tissue samples which having different acoustic impedance.