Audun Oppedal Pedersen

Audun Oppedal Pedersen
University of Bergen | UiB · Department of Physics and Technology

ph.d.

About

16
Publications
5,405
Reads
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76
Citations
Additional affiliations
April 2021 - present
ClampOn AS
Position
  • Engineer
Description
  • Secondary position
April 2021 - present
University of Bergen
Position
  • Professor (Associate)
August 2012 - April 2021
ClampOn AS
Position
  • Manager
Education
August 2003 - January 2007
University of Bergen
Field of study
  • Physical acoustics
August 2002 - July 2003
University of Bergen
Field of study
  • Postgraduate certificate in education
August 1997 - July 2002
University of Bergen
Field of study
  • Physical acoustics

Publications

Publications (16)
Article
Full-text available
Scientific advice for governmental management of marine resources relies on acoustical observation methods. Quantification and identification of fish and plankton species are often achieved using multi-frequency acoustic data. Accurate measurements of backscattering cross-sections and volume backscattering coefficients are essential. Systematic err...
Conference Paper
Throughout the oil and gas industry corrosion and erosion damage monitoring plays a central role in managing asset integrity. This paper describes a technology for monitoring of wall-loss rates across continuous areas of pipeline wall. Permanently installed ring arrays of non-invasive ultrasonic transducers delimit a monitored section. The arrays t...
Conference Paper
This paper discusses the latest developments in non-invasive corrosion/erosion monitoring with guided wave tomography for subsea and topside asset management. There are many technologies available for corrosion/erosion monitoring topside, but much fewer subsea. The subsea environment is difficult to access for instrument maintenance and verificatio...
Conference Paper
In multiple-target volume backscattering applications, the volume and cross-sectional area interrogated by the acoustic beam may be influenced by finite-amplitude sound propagation effects. To analyze the magnitude of such effects, generic governing equations for propagation and backscattering of small-and finite-amplitude signals in fluid media ar...
Article
Throughout the oil and gas industry corrosion and erosion damage monitoring plays a central role in managing asset integrity. This paper introduces a novel technology for continuous monitoring of wallloss rates in pipelines. A pair of permanently installed ring arrays of ultrasonic transducers encircles the pipe and delimits the section to be monit...
Article
Corrosion under insulation (CUI) is a common cause of pipeline failure in the oil and gas industry. Its detection with conventional inspection techniques is challenging due to the presence of the insulation layer and a protective metallic cladding that prevent direct access to the pipe surface. Currently, several techniques are being developed to d...
Technical Report
Full-text available
For abundance estimation and species identification on fisheries acoustic surveys, control with temperature and finite amplitude effects in the sea demands the calibration factor C of the conventional echo-integrator equation to be fully known in terms of the sonar system’s electrical and acoustical parameters. As no such expression is available fr...
Conference Paper
Full-text available
A sonar equation for finite amplitude (nonlinear) sound propagation has been derived, for backscattering from a single target in the far field. From this equation, power budget equations for finite amplitude sound propagation have been derived, for backscattering from single and multiple targets in the far field, giving expressions for measurement...
Article
Full-text available
The release or "slipping" of schooling species like mackerel (Scomber scombrus) and herring (Clupea harengus) in the later phases of hauling during purse-seine fishing has been shown to induce high mortality among the released fish. Unsuitable catches, with respect to species, fish size and/or quality, or excessively large catches are the main reas...
Article
Full-text available
No adequate technology has to our knowledge so far been developed for reliable online monitoring of harvested fish quantities. We demonstrate in this study that multiphase measurement technology successfully applied in the petroleum industry for measurements of pipeline flow of oil and gases (Nilsson, 1989; Stalheim, 1991; Halvorsen, 1992) also can...
Article
This paper describes a novel ultrasonic guided wave inspection technique for the monitoring of internal corrosion and erosion in pipes, which exploits the fundamental flexural mode to measure the average wall thickness over the inspection path. The inspection frequency is chosen so that the group velocity of the fundamental flexural mode is essen...
Article
Acoustic leak monitors in mechanical contact with components of special interest have clear advantages over many alternatives, in particular for continuous monitoring over time or during specific operations. Non-invasiveness and repeatability are among the most important benefits of this technology. In connection with a delivery of selfcontained, b...
Conference Paper
Full-text available
Fax number +47 55574041. Audun.Pedersen@cmr.no. Abstract: In estimation of fish stock abundance and discrimination between species, the effect of excess attenuation due to nonlinear sound propagation in water has been disregarded until recent years. It has been shown earlier that this may be significant to target strength measurements along the axi...

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