Geir A. Johansen

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A dual sensor tomograph for three-component flow imaging has been built at the University of Bergen in cooperation with Christian Michelsen Research AS and Norsk Hydro AS. It utilizes an eight-electrode electrical capacitance tomograph and a γ-ray tomograph with five radiation sources and 85 compact detectors. Embedded transputers using memory-mapped I/O(More)
Fourth generation medical X-ray scanners using a gantry with a rotating X-ray source and a fixed circular detector array as sensor head, are too slow for imaging of the process dynamics for instance in multiphase flows. To avoid inconsistent measurements and motion blurring, all measurements need to be carried out in a short time compared to the time(More)
Measurement of multiphase flow of gas, oil and water is not at all trivial and in spite of considerable achievements over the past two decades, important challenges remain (Corneliussen et al., 2005). These are related to reducing measurement uncertainties arising from variations in the flow regime, improving long term stability and developing new means for(More)
The problem of how to meter oil/water/gas mixtures is still a significant one in the oil industry. Considerable research has been conducted into the development of a three-phase flowmeter suitable for use in an offshore environment, and a number of commercial instruments are now available. This paper discusses why three phase flow measurement is important,(More)
An important application of computed tomography (CT) is that of non-destructive measurements of multiphase flows; an application area with high priority especially within the petroleum industry. Fourth generation CT scanners equipped with a rotating X-ray source are not sufficiently rapid to capture the flow dynamics typically present in multiphase flows.(More)
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