Browse Conferences
A hybrid model for propagation and scattering in a robotic acoustic imaging system
The authors have been working on a system based on transmission line matrix modelling (TLM). This formed part of a research program to develop sensing systems in advanced manufacturing using airborne ultrasound. A modelling system was requi...
Using acoustic cats eyes to improve mobile robot navigation
The processes of navigation and guidance of a mobile robot depend on inferences made from sensor measurements. These inferences become computationally more feasible, more reliable, and more accurate as the reliability and accuracy of the se...
A new real-time ultrasonic imaging system
Present day imaging systems exhibit many problems, such as, low temporal and lateral resolution, operator dependence, high cost and complexity etc. The new system described is an attempt to address these problems by combining the desirable ...
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...