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  • E-mailMagne.Vestrheim@uib.no
  • Phone+47 55 58 27 88
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    Allegt. 55
  • Postal Address
    Postboks 7803
    5020 BERGEN
Academic article
  • Show author(s) 2018. Finite element modeling of ultrasound measurement systems for gas. Comparison with experiments in air. Journal of the Acoustical Society of America. 2613-2625.
  • Show author(s) 2017. Beam diffraction effects in the backward wave regions of viscoelastic leaky Lamb modes for plate transmission at normal incidence. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 1558-1572.
  • Show author(s) 2016. Finite aperture influence on energy concentration, frequency shift, and signal enhancement, for acoustic transmission in the negative group velocity region of the S1 leaky Lamb mode. Proceedings - IEEE Ultrasonics Symposium. 1-4.
  • Show author(s) 2016. Beam diffraction effects in sound transmission of a fluid-embedded viscoelastic plate at normal incidence. Journal of the Acoustical Society of America. EL67-EL72.
  • Show author(s) 2015. Transducer beam diffraction effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence. Proceedings - IEEE Ultrasonics Symposium. 1-4.
  • Show author(s) 2012. Ultrasonic beam transmission through a water-immersed plate at oblique incidence using a piezoelectric source transducer. Finite element - angular spectrum modeling and measurements. IEEE International Ultrasonics Symposium Proceedings. 1972-1977.
  • Show author(s) 2001. "Resonance frequency spectra with convergence tests for piezoceramic disks using the finite element method". Acta Acustica united with Acustica. 271-285.
Report
  • Show author(s) 2008. "INDSURF project. 3D finite element simulations for a dual frequency band piezocomposite transducer using FEMP". .
  • Show author(s) 2007. "INDSURF project. Comparison of finite element (FE) and plane wave (Mason) types of simulations for a dual frequency band piezocomposite transducer". .
  • Show author(s) 2007. "INDSURF project. 3D finite element simulations for a dual frequency band piezocomposite transducer using FEMP". .
  • Show author(s) 2007. "Final report for the 2005-06 UoB-CMR "såkorn" project "3D finite element modelling (FEM) of precision non-wetted ultrasonic fiscal flow meters for oil and gas"". .
  • Show author(s) 2006. "Finite element modelling of ultrasonic piezoelectric transducers. Extension of FEMP to 3D analysis". .
  • Show author(s) 2004. "Ultrasonic technology for improved exploitation of petroleum resources. A Strategic Institute Programme (SIP). Status Report 2003". .
  • Show author(s) 2004. "Multipath ultrasonic liquid flow meter. Ultrasonic transducers for prototype light oil flow meter (Phase 2A). Production procedures". .
  • Show author(s) 2000. "Tables of resonance frequencies for disks of PZT-5A, PZT-5H, Pb(ZrTi)O3 and PbTiO3". .
  • Show author(s) 1999. “GERG project on ultrasonic flow meters. Phase II - Transducer testing. Part 1: Measurement methods. Part 2: KOS transducers. Part 3: Daniel transducers". .
  • Show author(s) 1999. "FEMP - Finite element modeling of piezoelectric structures. Theory and verification for piezoceramic disks". .
  • Show author(s) 1998. “Precision sound velocity cell for natural gas at high pressures. Phase 1 - Feasibility study”. .
  • Show author(s) 1997. "GARUSO - Version 1.0. Uncertainty model for multipath ultrasonic transit time gas flow meters". .
  • Show author(s) 1997. "EUCLID RTP 10.8 - Smart sonar array. Piezoelectric buzzer for a self calibrating hydrophone system. Work specifications - Rev. 2". .
  • Show author(s) 1997. "EUCLID RTP 10.8 - Smart sonar array. Piezoelectric buzzer for a self calibrating hydrophone system. Work specifications - Rev. 1". .
  • Show author(s) 1996. Wet gas flow metering. Ultrasonic transit time methods. Basic studies. .
  • Show author(s) 1996. Proceedings of the 19th Scandinavian symposium on physical acoustics. 10-1996. 10-1996. .
  • Show author(s) 1996. "Wet gas flow metering. Ultrasonic transit time methods. Basic studies. TOP - Online monitoring of oil and gas processes". .
  • Show author(s) 1995. "Modelling of loss effects in piezoceramic materials, and adaptation to measurements on radial and thickness modes in thin disks" (Expanded version of paper given at 15th International Congress on Acoustics (ICA '95), Trondheim, Norway, 26-30 June, 1995, Newman, M. (ed.), Volume I, pp. 381-384). .
  • Show author(s) 1995. "FMUSIK - Version 1.0. Uncertainty model for the 6-path FMU 700 ultrasonic gas flow meter". .
  • Show author(s) 1993. "FMU 700 - Fiskal måler ultralyd. Konstruksjonsunderlag". .
  • Show author(s) 1993. "FMU 700 - Fiskal måler ultralyd. Akustiske transdusere". .
  • Show author(s) 1992. "FGM 100 fakkelgasssmålar. Verknad av gassparametrar på ultralyd signaltransmisjon". .
  • Show author(s) 1991. "Presisjons ultralyd gass-strømningsmåler. Del 2 - Utvikling og konstruksjon. Design av akustiske transdusere i en flerstråle ultralyd gasstrømningsmåler. Arbeidsrapport nr. 2. Vol. I og II". .
  • Show author(s) 1991. "Piezoelectric transducer modelling. Thickness mode vibration". .
  • Show author(s) 1991. "Piezoelectric transducer modelling. Part 1: Basic equations for poled ferroelectric ceramics". .
  • Show author(s) 1990. "Shallow seismics using parametric acoustic sources". .
  • Show author(s) 1990. "Aluminium elektrolysecelle. Ultralydmåling av sjikttykkelser. Akustisk transmisjon i flytende kryolitt". .
  • Show author(s) 1989. "Shallow gas detection with a parametric seismic source. Phase 1: Feasibility study. Part 2: Technological basis for realization". .
  • Show author(s) 1989. "Presisjons ultralyd gass-strømningsmåler. Del 2 - Utvikling og konstruksjon. Rammespesifikasjoner for akustiske transdusere i en flerstråle ultralyd gasstrømningsmåler. Teknisk notat nr. 2.1". .
  • Show author(s) 1989. "Presisjons ultralyd gass-strømningsmåler. Del 2 - Utvikling og konstruksjon. Numeriske simuleringer av akustiske transdusere for en flerstråle ultralyd gasstrømningsmåler. Teknisk notat nr. 2.2". .
  • Show author(s) 1989. "Permanent multilayer well monitoring. A study of a down-hole instrumentation system for oil and gas production wells". .
  • Show author(s) 1989. "Aluminium elektrolysecelle. Ultralydmålinger av sjikttykkelser. Forprosjekt". .
  • Show author(s) 1988. "Shallow gas detection with a parametric seismic source. Phase I: Feasibility study. Part 1". .
  • Show author(s) 1988. "High precision ultrasonic flowmeter. Sensitivity study. Volume II". .
  • Show author(s) 1988. "High precision ultrasonic flowmeter. Sensitivity study. Volume I". .
  • Show author(s) 1988. "Full wave simulation of multilayer reflection coefficients in shallow seismics" (Expanded version of paper given at XI Scandinavian Cooperation Meeting in Acoustics / Hydrodynamics, Ustaoset, January 31 - February 3, 1988). .
  • Show author(s) 1987. "Full wave elastic modelling for seismic detection of shallow gas". (Expanded version of paper given at 49th Meeting and Technical Exhibition for the European Association of Exploration Geophysicists (EAEG'87), Belgrade, Yugoslavia, June 9-12, 1987). .
  • Show author(s) 1986. "Simuleringsprogrammet CAPROS Versjon 1.0. Programvaredokumentasjon". .
  • Show author(s) 1986. "Simuleringsprogrammet CAPROS Versjon 1.0. Brukarinstruksjon". .
  • Show author(s) 1986. "Lydforplantning fra seismisk kildearray. Simuleringsmodellen CAPROS". .
  • Show author(s) 1986. "High precision ultrasonic gas flowmeters. Feasibility study". .
Lecture
  • Show author(s) 2020. Thickness resonances and dispersion properties of leaky Lamb modes in a steel plate.
Academic lecture
  • Show author(s) 2020. Nearfield effects from leaky Lamb modes in a steel plate for normal beam incidence.
  • Show author(s) 2020. Complex dispersion properties of Lamb modes vs. Poisson’s ratio.
  • Show author(s) 2019. Characterization of ultrasound transmit-receive measurement systems in air. Comparison with prior work on piezoelectric elements in radial mode vibration.
  • Show author(s) 2018. Transmission through an isotropic viscoelastic water-coupled plate using a transmit-receive transducer system.
  • Show author(s) 2018. Comparison of angular spectrum models for baffled piston sound field with finite receiver apertures.
  • Show author(s) 2017. Vibration of a baffled piezoelectric ceramic circular disk in lower radial modes, with near- and farfield sound radiation.
  • Show author(s) 2017. Sound field radiation from a non-uniformly vibrating baffled and circular piezoelectric ceramic disk in radial mode vibration.
  • Show author(s) 2017. Finite aperture effects in the backward wave propagation region of a leaky Lamb mode at normal beam incidence.
  • Show author(s) 2017. Dispersion properties of Lamb and leaky Lamb modes in elastic and viscoelastic plates.
  • Show author(s) 2016. Transducer finite aperture effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence.
  • Show author(s) 2015. "Reciprocity calibration method for ultrasonic piezoelectric transducers in air. Comparison of finite element modelling and experimental measurements".
  • Show author(s) 2015. "Characterization of ultrasound transmit-receive measurement systems in air. Comparison of finite element modelling and experimental measurements".
  • Show author(s) 2015. "Beam transmission of water-embedded steel plate at normal incidence. Diffraction effects in the S1 to A3 region”.
  • Show author(s) 2014. Updated results on finite element modeling of a transmit-receive ultrasound measurement system. Comparison with experiments in air.
  • Show author(s) 2013. Ultrasonic beam transmission through a steel plate at oblique incidence: Uniform piston vs. piezoelectric transducer.
  • Show author(s) 2013. Reciprocity calibration method for ultrasonic, piezoelectric transducers in air, including finite element simulations.
  • Show author(s) 2013. "Reciprocity calibration method for ultrasonic piezoelectric transducers in air”.
  • Show author(s) 2013. "Interaction of a transducer excited ultrasonic beam with an elastic plate. 3D modeling in comparison with experiments”.
  • Show author(s) 2013. "Industrial ultrasound research at UiB/IFT. From gas flow measurement to structural monitoring".
  • Show author(s) 2013. "Finite element modeling of ultrasound measurement systems for gas. Use of a full receiver description in comparison with spherical reciprocity”.
  • Show author(s) 2013. "Finite element modeling of ultrasound measurement systems for gas. System model compared to measurements”.
  • Show author(s) 2012. "Ultrasonic beam transmission through a water-immersed plate at oblique incidence using a piezoelectric source transducer. Finite element - angular spectrum modeling and measurements”.
  • Show author(s) 2012. "Normal incidence ultrasonic beam transmission through a water-immersed plate using a piezoelectric source transducer. Finite element modeling, angular spectrum method and measurements".
  • Show author(s) 2011. Ultrasonic beam interactions with a fluid-immersed steel plate at normal and oblique incidence. Measurement results and comparisons with an angular spectrum method in frequency and time-domains.
  • Show author(s) 2011. Finite element analysis of acoustic beam interactions with a plate at normal incidence. Comparison with a 3D angular spectrum method and measurements.
  • Show author(s) 2011. Diffraction correction in ultrasonic fields for measurements of sound velocity in gas. Conventional and alternative methods.
  • Show author(s) 2011. 'Generalized Permittivity' and Source Sensitivity of Piezoelectric Ceramic Disks.
  • Show author(s) 2010. Modal and direct harmonic solution methods in FE modeling of piezoceramic disks.
  • Show author(s) 2010. "Ultrasonic piezoceramic transducers for air, - finite element analysis and measurements".
  • Show author(s) 2010. "Finite element analysis and measurement of ultrasonic piezoceramic transducers in air and water".
  • Show author(s) 2009. Finite Element Studies of Permittivity Constants in Piezoceramic Disks.
  • Show author(s) 2009. "Nonlinear sound propagation fisheries research echo" sounders (abstract).
  • Show author(s) 2008. "Ultrasonic signal transmission in plates. Study of a steel plate immersed in water".
  • Show author(s) 2008. "Nonlinear sound propagation fisheries research echo sounders".
  • Show author(s) 2007. Developments in transducer technology and reciprocity in ultrasonic flow meters.
  • Show author(s) 2007. "Reciprocal operation of ultrasonic flow meters: Criteria and applications".
  • Show author(s) 2007. "Precision sound velocity cell as reference for gas quality measurement in ultrasonic flow meters. Preliminary results using two candidate methods with argon at low pressure".
  • Show author(s) 2006. "Reciprocity in electroacoustic measurement systems, and reciprocal operation: Principles and applications to ultrasonic flow metering".
  • Show author(s) 2006. "Developments in transducer technology and reciprocity in ultrasonic flow meters".
  • Show author(s) 2006. "Developments in transducer technology and reciprocity in ultrasonic flow meters".
  • Show author(s) 2005. "Reciprocity and its utilization in ultrasonic flow meters".
  • Show author(s) 2005. "Quantification of nonlinear sound propagation effects in fisheries research echo sounders".
  • Show author(s) 2005. "Nonlinear sound propagation effects in fisheries research echo sounders - Measurements and simulations in fresh water".
  • Show author(s) 2005. "Nonlinear effects in fisheries and research echo sounders and sonars".
  • Show author(s) 2005. "Nonlinear effects in a 200 kHz sound beam".
  • Show author(s) 2005. "Investigation of precision sound velocity measurements as reference for ultrasonic gas flow meters".
  • Show author(s) 2005. "Finite element modeling of sound propagation from a piezoelectric transducer through an elastic layer".
  • Show author(s) 2005. "Electrical and acoustical response of of a Pz27 piezoelectric ceramic element in air. Finite element analyses and experimental results".
  • Show author(s) 2004. "Transient diffraction effects in piezoelectric ultrasonic transducers using finite element modelling".
  • Show author(s) 2004. "Methods for precision sound velocity measurements in pressure cells for gas characterization".
  • Show author(s) 2004. "Finite element modelling of piezoelectric ultrasonic transducer properties in natural gas".
  • Show author(s) 2004. "Convergence and accuracy of the Bergen Code for investigating nonlinear effects in fishery echo sounders".
  • Show author(s) 2003. "Transient diffraction effects in ultrasonic meters for volumetric, mass and energy flow measurement of natural gas".
  • Show author(s) 2003. "Transient diffraction effects in ultrasonic flow meters for gas and liquid".
  • Show author(s) 2003. "Signal modelling using the FLOSIM system model in ultrasonic instrumentation for industrial applications".
  • Show author(s) 2002. "Endelig element modellering av piezoelektriske transduser vibrasjoner".
  • Show author(s) 2001. "A ray theory approach to investigate the influence of flow velocity profiles on transit times in ultrasonic flow meters for gas and liquid".
  • Show author(s) 2000. "Finite element modeling of piezoceramic disks including radiation into a fluid medium".
  • Show author(s) 2000. "Challenges for improved accuracy and traceability in ultrasonic fiscal flow metering".
  • Show author(s) 2000. "Challenges for improved accuracy and traceability in ultrasonic fiscal flow metering of natural gas".
  • Show author(s) 1999. “Investigation of acoustic properties in wet gas for ultrasonic flowmetering”.
  • Show author(s) 1999. "FE simulations of piezoceramic disks with a front layer of varying thickness".
  • Show author(s) 1998. “Piezoelectric disks with a front layer. Comparisons of FEM with experimental data”.
  • Show author(s) 1997. "FEM analysis of piezoelectric disks - Method and testing".
  • Show author(s) 1996. Transit time determination in a measurement system, with effects of transducers.
  • Show author(s) 1995. "Modelling of loss effects in piezoceramic materials, and adaptation to measurements on radial and thickness modes in thin disks".
  • Show author(s) 1994. "Comparison of models for radial and thickness modes in piezoceramic disks".
  • Show author(s) 1990. "Aspects of transducer modelling".
  • Show author(s) 1989. "Ultrasonic pulse propagation in stratified multiphase media".
  • Show author(s) 1989. "The interaction of seismic waves with shallow gas structures".
  • Show author(s) 1989. "Pulse generation using a parametric source".
  • Show author(s) 1988. "Signalbehandling i parametriske antenner".
  • Show author(s) 1988. "Parametrisk lydkilde. Optimalisering".
  • Show author(s) 1988. "Numerical simulation of ultrasonic flowmeters".
  • Show author(s) 1988. "High resolution shallow seismic surveying using parametric acoustic source technology".
  • Show author(s) 1988. "Full wave simulation of multilayer reflection coefficients in shallow seismics".
  • Show author(s) 1987. "Utvikling av akustiske transdusere for gass-strømmåling".
  • Show author(s) 1987. "Simuleringsverktøy for ultralyd væske og gasstrømningsmåling".
  • Show author(s) 1987. "Simulering av full-bølge lydforplantning i marin seismikk".
  • Show author(s) 1987. "Numerical simulation of ultrasonic flowmeters".
  • Show author(s) 1987. "Full wave elastic modelling for seismic detection of shallow gas".
  • Show author(s) 1987. "Full bølgje FFP simulering for seismisk gasslommedeteksjon".
  • Show author(s) 1986. "Tredimensjonal FFP modellering av elastiske bølgjer i horisontalt stratifiserte media".
Academic anthology/Conference proceedings
  • Show author(s) 2000. "GERG project on ultrasonic gas flow meters, Phase II. GERG Technical Monograph TM11. Groupe Européen de Recherches Gazières". VDI Verlag.
Thesis at a second degree level
  • Show author(s) 1997. "Endelig element modellering av piezoelektriske skiver" (Cand. Scient. thesis).
  • Show author(s) 1994. "Utnyttelse av resonansmodi i ultralyd transduserkonstruksjonar" (Cand. Scient. thesis).
Masters thesis
  • Show author(s) 2020. Normal incidence ultrasonic beam transmission through steel plates. Measuring and modelling the transmission coefficient.
  • Show author(s) 2019. Ultrasonic measurement system for gas. Experimental and theoretical characterization using piezoelectric elements at radial mode vibration in air.
  • Show author(s) 2019. Lydhastighetsmålinger med og uten resonanseffekter i en viskoelastisk stålplate i vann.
  • Show author(s) 2018. Beam diffraction effects in guided-wave transmission of fluid embedded elastic plate. Influence of receiver distance and finite aperture .
  • Show author(s) 2017. Ultrasonic measurement systems with diffraction correction for gas .
  • Show author(s) 2015. Ultrasonic measurement systems for gas. Finite element modelling compared with measurements in air.
  • Show author(s) 2015. Reciprocity calibration of ultrasonic piezoelectric disks in air.
  • Show author(s) 2013. Reciprocity calibration method for ultrasonic piezoelectric transducers in air. (Master thesis).
  • Show author(s) 2013. Finite element modeling of ultrasound measurement systems for gas. Comparison with experiments in air. (Master thesis).
  • Show author(s) 2009. Undersøkelser av piezokeramiske skiver. Målinger og endelig element analyser.
  • Show author(s) 2009. Bestemmelse av egenskaper til piezoelektriske skiver med lavt diameter/tykkelse forhold.
  • Show author(s) 2007. Radiellmode Svingninger i Piezoelektriske Ultralydtransdusere for Luft. Målinger og Endelig Element Analyser.
  • Show author(s) 2005. "Undersøkelse og utnyttelse av svingemoder i ultralyd tranduserkonstruksjon" (Master thesis).
Doctoral dissertation
  • Show author(s) 2015. Diffraction effects in the ultrasonic field of transmitting and receiving circular piezoceramic disks in radial mode vibration. FE modelling and comparison with measurements in air .
  • Show author(s) 2014. Interaction of piezoelectric transducer excited ultrasonic pulsed beams with a fluid-embedded viscoelastic plate. Finite element modeling, angular spectrum modeling and measurements (PhD thesis).
  • Show author(s) 2007. Acoustic measurement of liquid density with applications for mass measurement of oil.
  • Show author(s) 2007. "Sound velocity cell for gas characterization" (PhD thesis).
  • Show author(s) 2006. "Effects of nonlinear sound propagation in fisheries research" (PhD thesis).
  • Show author(s) 2000. Finite Element Modeling of Ultrasonic Piezoelectric Transducers. Influence of geometry and material parameters on vibration, response functions and radiated field.
  • Show author(s) 2000. "Finite element modelling of ultrasonic piezoelectric transducers. Influence of geometry and material parameters on vibration response functions and radiated field" (Dr. Scient. thesis).
Poster
  • Show author(s) 2011. Diffraction correction for precision measurements of sound velocity in gas. Use of an alternative method for non-uniform piezoelectric transmitting transducer vibration (Poster).
  • Show author(s) 2005. Ikkelineær lydforplantning ved bruk av ekkolodd i firskeriforvaltning.
  • Show author(s) 2005. Consequences of non-linear sound propagation on target strength measurements - preliminary studies.
  • Show author(s) 2005. "Investigation of precision sound velocity measurement methods as reference for ultrasonic gas flow meters".

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