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Geir Anton Johansen's picture

Geir Anton Johansen

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

More information in national current research information system (CRIStin)