Browse Conferences
An acoustic camera for 3D underwater imaging
Underwater inspection and work operations are often restricted by turbid water caused by soft particles being stirred up by current, moving vehicles, thrusters, tools etc. A three dimensional real-time acoustic camera is being developed by ...
Albunex-a new ultrasound contrast agent
Albunex (Molecular Biosystems Inc (MBI), San Diego, USA and Nycomed Imaging AS, Oslo, Norway) is the first ultrasound contrast agent that is stable enough to show transpulmonary passage. This implies that the contrast agent can be injected ...
A synthetic aperture sonar image processing system
Synthetic aperture techniques are well established in radar systems but are, however, relatively novel in sonar systems. The advantages gained from the use of a synthetic aperture, i.e., the resolution potential of a long array with the con...
A complex frequency approach towards pulse-echo attenuation estimation
This paper introduces a novel technique for substantially correcting the influence of interference effects on attenuation estimates from backscattered rf A-line data. The technique is grounded in the approach of regarding pulse-echo attenua...
An acoustic method to evaluate cement quality in an oil well
The authors present a brief introduction to the construction and principle of the Cement Bond Log Tool. A model of wave propagation and attenuation by the cement in the annulus is then given, and the Bond Percentage Index (BPI) interpretati...
Higher order interpolation techniques
The kernel of the fifth order convolution interpolation has been calculated in such a way that permits higher order calculations. Comparison of the accuracies of different orders are given for some specific cases.<<ETX xmlns:mml="http://www...
The generation of acoustic pulses for auditory localisation experiments
In order to obtain pulse response measurements a source of high quality acoustic pulses is required. This paper describes a method by which very high quality acoustic pulses can be produced simply, and at moderate cost. The pulses are suita...
3D Sonargraphics-a seabed survey tool
The Sonargraphics system developed by British Gas is a small scale three dimensional (3D) motion compensated subsea surveying tool. It is a modular design allowing it to be configured for a number of applications and deployment methods. It ...
The performances of the bidirectional associative memory in noise-corrupted character recognition
Artificial neural nets to detect lines in noise
This work discusses some investigations on the detection of lines in noise. The motivation comes from the effort being put into naval sonars to detect sources of decreasing signal strength. This has as a consequence an increase in the total...