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Geir Anton Johansens bilde

Geir Anton Johansen

Professor, Leder av Smart Ocean - Senter for forskningsdrevet innovasjon
  • E-postGeirAnton.Johansen@uib.no
  • Telefon+47 55 58 27 45+47 911 43 615
  • Besøksadresse
    Institutt for fysikk og teknologi
    Allégaten 55
    5007 Bergen
    Rom 
    248
  • Postadresse
    Postboks 7803
    5020 BERGEN
  • Radiation physics
  • Measurement science
  • Multiphase process measurements
  • Industrial tomography
Vitenskapelig artikkel
  • Vis forfatter(e) 2014. Tomographic segmentation in multiphase flow measurement. Radiation Physics and Chemistry. 420-423.
  • Vis forfatter(e) 2014. On the ill-conditioning of the multiphase flow measurement by prompt gamma-ray neutron activation analysis. Radiation Physics and Chemistry. 401-404.
  • Vis forfatter(e) 2014. A library least-squares approach for scatter correction in gamma-ray tomography. Radiation Physics and Chemistry. 39-47.
  • Vis forfatter(e) 2012. Tomographic multiphase flow measurement. Applied Radiation and Isotopes. 1080-1084.
  • Vis forfatter(e) 2012. On the treatment of ill-conditioned cases in the Monte Carlo library least-squares approach for inverse radiation analyzers. Measurement Science and Technology.
  • Vis forfatter(e) 2012. Enhancement of the intrinsic gamma-ray stopping efficiency of Geiger–Muller counters. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. 46-54.
  • Vis forfatter(e) 2011. Produced water characterization by prompt gamma-ray neutron activation analysis. Measurement Science and Technology. 10 sider.
  • Vis forfatter(e) 2011. Monte Carlo simulation for multi-channel gamma-ray process tomography. Measurement Science and Technology. 10 sider.
  • Vis forfatter(e) 2011. Monte Carlo modelling of gamma-ray stopping efficiencies of Geiger-Muller counters. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. 61-66.
  • Vis forfatter(e) 2011. Dual-mode capacitance and gamma-ray tomography using the Landweber reconstruction algorithm. Measurement Science and Technology. 7 sider.
  • Vis forfatter(e) 2011. A single scatter electron Monte Carlo approach for simulating gamma-ray stopping efficiencies of Geiger-Müller counters. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. 279-287.
  • Vis forfatter(e) 2010. Salinity and flow regime independent multiphase flow measurements. Flow Measurement and Instrumentation. 454-461.
  • Vis forfatter(e) 2010. Flow imaging by high speed transmission tomography. Applied Radiation and Isotopes. 518-524.
  • Vis forfatter(e) 2010. Dynamic characterization of a high speed gamma-ray tomograph. Flow Measurement and Instrumentation. 538-545.
  • Vis forfatter(e) 2008. Semi-empirical scatter correction model for high-speed gamma-ray tomography. Measurement Science and Technology. 6 sider.
  • Vis forfatter(e) 2008. Experimental analysis of high-speed gamma-ray tomography performance. Measurement Science and Technology. 10.
  • Vis forfatter(e) 2008. A data acquisition and control system for high-speed gamma-ray tomography. Measurement Science and Technology. 9 sider.
  • Vis forfatter(e) 2007. A simple and efficient active quenching circuit for Geiger-Muller counters. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. 358-361.
  • Vis forfatter(e) 2006. A dual modality tomography system for imaging gas/solids flows. Particle & Particle Systems Characterization. 260-265.
  • Vis forfatter(e) 2005. Scattered gamma radiation utilized for level measurements in gravitational separators. IEEE Sensors Journal. 175-182.
  • Vis forfatter(e) 2005. Produced water characterization by dual modality gamma-ray measurements. Measurement Science and Technology. 1007-1013.
  • Vis forfatter(e) 2005. Nuclear tomography methods in industry. Nuclear Physics A. 696-705.
  • Vis forfatter(e) 2005. Multimodality tomography for multiphase hydrocarbon flow measurements. IEEE Sensors Journal. 153-160.
  • Vis forfatter(e) 2004. Scattered gamma-radiation utilized to measure remnant fresh absorbent in absorbent beds. Measurement Science and Technology. 1827-1834.
  • Vis forfatter(e) 2003. A multiple voxel model for scattered gamma radiation in pipe flow. Measurement Science and Technology. 1777-1782.
  • Vis forfatter(e) 2002. Multiphase flow regime identification by multibeam gamma-ray densitometry. Measurement Science and Technology. 1319-1326.
  • Vis forfatter(e) 2002. A compact low energy multibeam gamma-ray densitometer for pipe-flow measurements. Nuclear Instruments and Methods in Physics Reseach B. 301-309.
  • Vis forfatter(e) 2001. Level measurement and control strategies for subsea separators. Journal of Electronic Imaging (JEI). 679-689.
  • Vis forfatter(e) 2000. Salinity independent measurement of gas volume fraction in oil/gas/water pipe flows. Applied Radiation and Isotopes. 595-601.
  • Vis forfatter(e) 2000. Dual modality Densitometry (DMD) - for salinitetsuavhengig måling av gassfraksjon i olje/vann/gass-rørstrømning. Elektronikk : tidsskrift for IT og telekom.
  • Vis forfatter(e) 1999. Determination of void fraction and flow regime using a neural network trained on simulated data based on gamma-ray densitometry. Measurement Science and Technology. 619-630.
  • Vis forfatter(e) 1999. A radiation transport model as a design tool for gamma densitometers. Nuclear Instruments and Methods in Physics Research A. 347-355.
  • Vis forfatter(e) 1998. Improved void fraction determination by means of multibeam gamma-ray attenuation measurments. Flow Measurement and Instrumentation. 100-108.
  • Vis forfatter(e) 1997. The use of entropic thresholding methods in reconstruction of capacitance tomography data. Chemical Engineering Science (CES). 2149-2159.
  • Vis forfatter(e) 1997. Resent developments in three -phase flow measurement. Measurement Science and Technology.
  • Vis forfatter(e) 1997. Process Tomography in Oil Industry - State of the Art and Future Possibilities. Measurement and Control. 212-216.
  • Vis forfatter(e) 1993. ElPed: An interactive PC-based learning program for basic electrical circuits. Computers in physics. 577-584.
Rapport
  • Vis forfatter(e) 2014. Report on the Consultant Meeting on "The Current Status and Future Trends on Radioisotope Applications in Industry". .
  • Vis forfatter(e) 2009. Muligheter for tettere samarbeid med institusjoner i Midtvesten. .
  • Vis forfatter(e) 2008. Industrial Process Gamma Tomography. .
  • Vis forfatter(e) 2006. Industrial process gamma tomography - 3rd RCM Report. .
  • Vis forfatter(e) 2002. Feasibility tests of using a fluorescence X-ray tube in a pipe-flow densitometer. 2001-01. 2001-01. .
  • Vis forfatter(e) 2001. VLSI radiation detector electronics and its application to tomography. 2001-03. 2001-03. .
  • Vis forfatter(e) 2001. MiniGamma - a compact gamma-ray densitometer. 2001-08. 2001-08. .
  • Vis forfatter(e) 2001. Compact gamma-ray densitometer for pipe flow measurements - a feasibility study. 2001-01. 2001-01. .
  • Vis forfatter(e) 2000. Geiger Müller tubes in gamma-ray densitometry - a feasibility study. 2000-01. 2000-01. .
  • Vis forfatter(e) 1998. The use of Multiple Gamma-Beams for Monitoring and Control of Down-hole Hydrocyclone Separators. 03-1998. 03-1998. .
  • Vis forfatter(e) 1998. Guidelines for graduate students - hints and help about project management and reporting. 1998-01. 1998-01. .
Populærvitenskapelig foredrag
  • Vis forfatter(e) 2009. Vestlandet som energiregion - Månelanding, solnedgang - eller soloppgang?
  • Vis forfatter(e) 2009. Petroleumsforskning ved UiB.
  • Vis forfatter(e) 2008. Forskning på miljøvennlig energi: Kan Bergensregionen ligge i tet?
  • Vis forfatter(e) 2007. Utfordringer for Kunnskapsbyen Bergen sett fra mitt perspektiv.
  • Vis forfatter(e) 2007. Høgskolen og Universitetet – i samspill for forskning, utdanning og innovasjon i Bergen.
  • Vis forfatter(e) 2007. CO2-alliansen.
  • Vis forfatter(e) 2006. TeknoVest - Utdanningsnettverk på Vestlandet.
  • Vis forfatter(e) 2004. Utdannelse i Prosessteknologi ved Universitetet i Bergen.
  • Vis forfatter(e) 2004. Organisering av ingeniørutdanningen.
  • Vis forfatter(e) 2004. Olje og gass - en spennende utdanning ved Universitetet i Bergen.
  • Vis forfatter(e) 2004. Kvalitet i forskning. Publisering og formidling.
Vitenskapelig foredrag
  • Vis forfatter(e) 2017. Tomographic methods for multiphase flow measurement.
  • Vis forfatter(e) 2014. Non-destructive monitoring of multiphase hydrocarbon flow by high-speed gamma-ray tomography.
  • Vis forfatter(e) 2014. Monte Carlo assisted design, development and characterization of an industrial gamma-ray tomograph.
  • Vis forfatter(e) 2013. Status of Geiger-Müller counters for tomographic multiphase flow measurements.
  • Vis forfatter(e) 2013. Monitoring of scale deposition in petroleum pipelines by means of photon scattering – a preliminary study.
  • Vis forfatter(e) 2012. The particle system iterative reconstruction technique in a high speed gamma-ray tomograph.
  • Vis forfatter(e) 2012. On the ill-conditioning of the multiphase flow measurement by prompt gamma-ray neutron activation analysis.
  • Vis forfatter(e) 2012. Inherent dual mode single energy gamma-ray tomography.
  • Vis forfatter(e) 2012. Industrial applications of tomographic gamma-ray methods.
  • Vis forfatter(e) 2011. Tomographic Multiphase Flow Measurement.
  • Vis forfatter(e) 2011. Multibeam Gamma-ray Measurements and Electrical Tomography for Improved Multiphase Flow Metering.
  • Vis forfatter(e) 2011. A Single Scatter Electron Monte Carlo Approach for Simulating Gamma-Ray Stopping Efficiencies of Geiger-Muller Counters.
  • Vis forfatter(e) 2010. Static characterization of dual mode capacitance and gamma-ray tomography using the Landweber reconstruction algorithm.
  • Vis forfatter(e) 2010. Salinity and flow regime independent multiphase flow measurements.
  • Vis forfatter(e) 2010. Fluid Characterization by Prompt Gamma-ray Neutron Activation Analysis (PGNAA).
  • Vis forfatter(e) 2010. Dynamic characterization of a high speed gamma-ray tomograph.
  • Vis forfatter(e) 2009. Recent developments in flow imaging tomography.
  • Vis forfatter(e) 2009. Computed tomographic system for industrial multiphase mixture analysis.
  • Vis forfatter(e) 2008. High speed gamma-ray tomography for hydrocarbon flow applications.
  • Vis forfatter(e) 2008. Geiger Müller Detectors For Gamma-Ray Tomography.
  • Vis forfatter(e) 2008. Flow imaging by high speed transmission tomography.
  • Vis forfatter(e) 2008. A novel subsea on-line multiphase fluid sampling and analysis system.
  • Vis forfatter(e) 2007. USB-based data acquisition and control system for high speed gamma-ray tomography.
  • Vis forfatter(e) 2007. USB-based Data Acquisition and Control System for High Speed Gamma-ray Tomography.
  • Vis forfatter(e) 2007. Semi-empirical scatter correction models for high speed gamma-ray tomography.
  • Vis forfatter(e) 2007. Semi-empirical Scatter Correction Models for High-Speed Gamma-Ray Tomography.
  • Vis forfatter(e) 2007. Overview of Hardfield Tomography Capabilities and Technology.
  • Vis forfatter(e) 2007. Investigation of Prompt Gamma-Ray Neutron Activation nalysis for Determining Phase Amounts in Multiphase Flow.
  • Vis forfatter(e) 2007. Gamma-ray transmission tomography.
  • Vis forfatter(e) 2007. EXPERIMENTAL TEST OF A NOVEL RECONSTRUCTION APPROACH BASED ON IRREGULAR GRID FOR HIGH-SPEED GAMMA-RAY TOMOGRAPHY.
  • Vis forfatter(e) 2007. EXPERIMENTAL TEST OF A NOVEL RECONSTRUCTION APPROACH BASED ON IRREGULAR GRID FOR HIGH-SPEED GAMMA-RAY TOMOGRAPHY.
  • Vis forfatter(e) 2007. Comparing Analysis of Image Visualisation Accuracy of Electrical Capacitance Tomography and Gamma Tomography.
  • Vis forfatter(e) 2007. Comparing Analysis of Image Visualisation Accuracy of Electrical Capacitance Tomography and Gamma Tomography.
  • Vis forfatter(e) 2007. A Novel Subsea On-line Multiphase Fluid Sampling and Analysis System.
  • Vis forfatter(e) 2006. Recent developments within gamma-ray tomography in Bergen.
  • Vis forfatter(e) 2006. Fluid composition analysis by multiple gamma-ray beam and modality measurements.
  • Vis forfatter(e) 2006. Experimental noise analysis of reconstructed pixel values in high-speed gamma-ray tomography.
  • Vis forfatter(e) 2006. Experimental noise analysis of reconstructed pixel values in high-speed gamma-ray tomography.
  • Vis forfatter(e) 2005. Multiphase flow measurement research in Bergen.
  • Vis forfatter(e) 2005. Multiphase flow measurement and imaging.
  • Vis forfatter(e) 2005. First experimental results of multiphase hydrocarbon flow monitoring using dual modality gamma-ray tomography and high frequency magnetic field sensors.
  • Vis forfatter(e) 2005. First experimental results of multiphase hydrocarbon flow monitoring using dual modality gamma-ray tomography and high frequency magnetic field sensors.
  • Vis forfatter(e) 2005. First experimental results from a dual modality flow imaging system.
  • Vis forfatter(e) 2005. A dual modality tomography system for imaging gas/solids flows.
  • Vis forfatter(e) 2004. Radioisotope Methods in Industry - from One-shot to Tomography.
  • Vis forfatter(e) 2004. Nuclear methods in industry � seeing is believing.
  • Vis forfatter(e) 2004. Advances in multi modality tomography for multiphase hydrocarbon flow.
  • Vis forfatter(e) 2003. multiphase flow regime identification by multibeam gamma-ray densitometry - experimental results.
  • Vis forfatter(e) 2003. Scattered Gamma Radiation Utilized for Level Measurements in Gravitational Separators.
  • Vis forfatter(e) 2003. Automatic weight matrix generation for gamma-ray tomography.
  • Vis forfatter(e) 2003. Automatic weight matrix generation for gamma-ray tomography.
  • Vis forfatter(e) 2003. Automatic weight matrix generation for gamma-ray tomography.
  • Vis forfatter(e) 2002. Scattered gamma radiation utilised to measure remnant fresh absorbent in absorbent beds.
  • Vis forfatter(e) 2002. Mini-gamma; a multiple beam system for pipe flow identification and measurement.
  • Vis forfatter(e) 2002. A COMPACT LOW-ENERGY MULTIBEAM GAMMA-RAY DENSITOMETER FOR PIPE-FLOW MEASUREMENTS.
  • Vis forfatter(e) 2000. Recent developments in hydrocarbon separator interface imaging.
  • Vis forfatter(e) 2000. Industriell prosesstomografi.
  • Vis forfatter(e) 2000. Does Process Tomography Offer a Viable Alternative to Current Offshore Three-phase Flow Measurement Techniques?
  • Vis forfatter(e) 1999. Void fraction and flow regime determination by low-energy multi-beam gamma-ray densitometry.
  • Vis forfatter(e) 1998. Measurement principles in Multiphase metering - Their Benefits and Limitations.
  • Vis forfatter(e) 1998. Industriell prosesstomografi.
  • Vis forfatter(e) 1997. Responses of EGS¤ low-energy gamma-densitometer simulation process.
  • Vis forfatter(e) 1997. Reconstruction of capactiance tomography data using global enthropic thresholding methods: Experimental Evaluation.
  • Vis forfatter(e) 1997. Measurement strategies for downhole multiphase metering.
  • Vis forfatter(e) 1997. Basic principle in multiphase metering - advantages and disadvantages, properties and potentials.
  • Vis forfatter(e) 1997. Basic principle in multiphase metering - advantages and disadvantages, properties and potentials.
  • Vis forfatter(e) 1997. A recent development in detector systems for gamma-ray tomography.
  • Vis forfatter(e) 1997. A flexible test platform for investigating gamma-ray tomography geometries and applications.
  • Vis forfatter(e) 1996. Advances in nuclear radiation detectors for fluid flow measurment.
  • Vis forfatter(e) 1992. A new Detector Concept for Energetic Auroral X-Ray Imaging.
Leder
  • Vis forfatter(e) 2008. Industrial process tomography. Measurement Science and Technology. 1 sider.
Leserinnlegg
  • Vis forfatter(e) 2009. Næringslivet + UiB er en mulighet. Bergens Tidende.
  • Vis forfatter(e) 2004. Om HiB-UiB-samarbeid og kjøttkvalitet. Bergens Tidende.
Fagbok
  • Vis forfatter(e) 2004. Radioisotope Gauges for Industrial Process Measurements. John Wiley & Sons.
Hovedfagsoppgave
  • Vis forfatter(e) 2006. Gammadeteksjon ved bruk av scintillasjonskrystall og fotodiode.
  • Vis forfatter(e) 2005. Nivåmåling ved hjelp av spredt gammastråling.
Mastergradsoppgave
  • Vis forfatter(e) 2010. Enhancing gamma-ray stopping efficiency in Geiger-Müller tubes.
  • Vis forfatter(e) 2008. Målefeil og drift i ultralydmåler under bruk i felt.
  • Vis forfatter(e) 2008. Monte Carlo modelling of the intrinsic stopping efficiency in Geiger Müller detectors.
  • Vis forfatter(e) 2008. Monte Carlo modelling of gamma-ray attenuation in a subsea fluid analyzer system.
  • Vis forfatter(e) 2006. Test av Dmd-prinsippet i trefase strømningsrigg.
  • Vis forfatter(e) 2006. Detektering og analysering av gammastråling.
  • Vis forfatter(e) 2006. A LabVIEW implemented digital Multi Channel Analyzer (MCA).
Kronikk
  • Vis forfatter(e) 2019. Derfor skal Vestlandet klare å skape nye industrieventyr. sysla.no.
  • Vis forfatter(e) 2015. Høgskolene trenger praktikere. Dagens næringsliv. 1 sider.
  • Vis forfatter(e) 2008. UiB og næringslivet. Bergens Tidende.
  • Vis forfatter(e) 2006. Nettverksrekruttering til matematikk, naturvitenskap og teknologinen. Forskerforum. 34-35.
Doktorgradsavhandling
  • Vis forfatter(e) 2015. Radial X-ray backscatter imaging for well integrity inspections. Non-destructive inspection of oil wells with high energy X-rays.
  • Vis forfatter(e) 2015. Radial X-ray backscatter imaging for well integrity inspections.
  • Vis forfatter(e) 2009. Design optimization of high speed gamma-ray tomography.
  • Vis forfatter(e) 2004. Gamma-Ray Scatter Methods Applied to Industrial Measurement Systems.
  • Vis forfatter(e) 1990. Development and analysis of silicon based detectors for low energy nuclear radiation.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Vis forfatter(e) 2005. Advanced experimental techniques. 125 sider.
  • Vis forfatter(e) 1998. The use of Multiple Gamma-Beams for Monitoring and Control of Down-hole Hydrocyclone Separators. -7 sider.
Poster
  • Vis forfatter(e) 2017. A Geometric Approach to Spectral Analysis.
  • Vis forfatter(e) 2006. Gamma-ray stopping efficiencies of geiger-müller counters.
  • Vis forfatter(e) 2006. A simple and efficient active quenching circuit for geiger-müller counters.
  • Vis forfatter(e) 2001. The use of gamma radiation in fluid flow measurements.
Digitale læremidler
  • Vis forfatter(e) 2005. Multiphase metering.
Vitenskapelig oversiktsartikkel/review
  • Vis forfatter(e) 2013. Three-phase flow measurement in the petroleum industry. Measurement Science and Technology. 17 sider.

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