Browse Conferences
Acoustic Doppler current profilers-a tool for both physical and biological oceanographers
An acoustic Doppler current profiler is used routinely for measurements of ocean currents by physical oceanographers. The instrument relies upon acoustic backscatter from biological particles in the water and is therefore a potential source...
Ultrasonic tissue characterization using fractal feature
The quantitative characterization of an ultrasonic image of carotid artery is carried out using the fractal dimension and second-order statistical parameter. In each image, a number of regions are chosen for analysis. Each region correspond...
Acoustic diagnostics in process plant: application of pattern recognition techniques
Sound generated in process plants can be used to monitor the progress of the reactions taking place within a vessel, or to monitor fluid flows within a process line. The sound transmits through the structure of the plant itself, and can be ...
Measurement of grain size in metals by acoustic scattering provides improved quality
The principle of the measurement technique is the scattering of ultrasound by discontinuities in the metal. Ultrasound in metals is dissipated by internal friction and scattered by discontinuities in the metallic structure. The grains or cr...
Acoustic detection of physiological change within the thorax
This paper presents the initial results of the development of a non-invasive, in vivo method for the detection of physiological changes within the thorax. An acoustic method is used; where, by generating a variable frequency acoustic in the...
Recent progress in acoustic imaging and microanalysis of new materials and devices by scanning acoustic microscopy
The authors describe acoustic characterisation techniques and then, in order to improve the quality of materials to detect defects or to determine elastic constants, we report some new qualitative and quantitative results obtained in many f...
Thermoelastic nondestructive evaluation of carbon fibre reinforced composites using an intensity modulated power laser beam
Carbon fibre reinforced composite plates can be inspected using laser generated ultrasound. In this paper, we propose a thermoelastic method using an Ar ion laser that produces images of subsurface defects in composite plates without mechan...
Ocean botton recognition from acoustic reflection data
In this paper we present an algorithm for the density and sound speed reconstruction of a two-layered bottom consisting of a fluid sediment layer over a fluid substrate of semi-infinite extend. The thickness of the sediment as well as the a...
Quantitative correlation of acoustical and light microscopy
A new method has been developed to correlate acoustical spectral parameters and histology at a microscopic scale. The local acoustical parameters of a section of 250 mu m thickness are correlated to histological parameters of an adjacent se...
Ray approximation approach for ocean tomography
In this paper, an approach to ocean acoustic tomography is considered. The aim is to derive from the ray approximation a full-determined inverse algorithm, which may bring out an expected estimate of sound-speed perturbations. Simulation il...