Hjem
Magne Vestrheims bilde

Magne Vestrheim

Emeritus
Vitenskapelig artikkel
  • Vis forfatter(e) (2018). Finite element modeling of ultrasound measurement systems for gas. Comparison with experiments in air. Journal of the Acoustical Society of America. 2613-2625.
  • Vis forfatter(e) (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.
  • Vis forfatter(e) (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.
  • Vis forfatter(e) (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.
  • Vis forfatter(e) (2015). Transducer beam diffraction effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence. Proceedings - IEEE Ultrasonics Symposium. 1-4.
  • Vis forfatter(e) (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.
  • Vis forfatter(e) (2001). "Resonance frequency spectra with convergence tests for piezoceramic disks using the finite element method". Acta Acustica united with Acustica. 271-285.
Rapport
  • Vis forfatter(e) (2008). "INDSURF project. 3D finite element simulations for a dual frequency band piezocomposite transducer using FEMP". .
  • Vis forfatter(e) (2007). "INDSURF project. Comparison of finite element (FE) and plane wave (Mason) types of simulations for a dual frequency band piezocomposite transducer". .
  • Vis forfatter(e) (2007). "INDSURF project. 3D finite element simulations for a dual frequency band piezocomposite transducer using FEMP". .
  • Vis forfatter(e) (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"". .
  • Vis forfatter(e) (2006). "Finite element modelling of ultrasonic piezoelectric transducers. Extension of FEMP to 3D analysis". .
  • Vis forfatter(e) (2004). "Ultrasonic technology for improved exploitation of petroleum resources. A Strategic Institute Programme (SIP). Status Report 2003". .
  • Vis forfatter(e) (2004). "Multipath ultrasonic liquid flow meter. Ultrasonic transducers for prototype light oil flow meter (Phase 2A). Production procedures". .
  • Vis forfatter(e) (2000). "Tables of resonance frequencies for disks of PZT-5A, PZT-5H, Pb(ZrTi)O3 and PbTiO3". .
  • Vis forfatter(e) (1999). “GERG project on ultrasonic flow meters. Phase II - Transducer testing. Part 1: Measurement methods. Part 2: KOS transducers. Part 3: Daniel transducers". .
  • Vis forfatter(e) (1999). "FEMP - Finite element modeling of piezoelectric structures. Theory and verification for piezoceramic disks". .
  • Vis forfatter(e) (1998). “Precision sound velocity cell for natural gas at high pressures. Phase 1 - Feasibility study”. .
  • Vis forfatter(e) (1997). "GARUSO - Version 1.0. Uncertainty model for multipath ultrasonic transit time gas flow meters". .
  • Vis forfatter(e) (1997). "EUCLID RTP 10.8 - Smart sonar array. Piezoelectric buzzer for a self calibrating hydrophone system. Work specifications - Rev. 2". .
  • Vis forfatter(e) (1997). "EUCLID RTP 10.8 - Smart sonar array. Piezoelectric buzzer for a self calibrating hydrophone system. Work specifications - Rev. 1". .
  • Vis forfatter(e) (1996). Wet gas flow metering. Ultrasonic transit time methods. Basic studies. .
  • Vis forfatter(e) (1996). Proceedings of the 19th Scandinavian symposium on physical acoustics. 10-1996. 10-1996. .
  • Vis forfatter(e) (1996). "Wet gas flow metering. Ultrasonic transit time methods. Basic studies. TOP - Online monitoring of oil and gas processes". .
  • Vis forfatter(e) (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). .
  • Vis forfatter(e) (1995). "FMUSIK - Version 1.0. Uncertainty model for the 6-path FMU 700 ultrasonic gas flow meter". .
  • Vis forfatter(e) (1993). "FMU 700 - Fiskal måler ultralyd. Konstruksjonsunderlag". .
  • Vis forfatter(e) (1993). "FMU 700 - Fiskal måler ultralyd. Akustiske transdusere". .
  • Vis forfatter(e) (1992). "FGM 100 fakkelgasssmålar. Verknad av gassparametrar på ultralyd signaltransmisjon". .
  • Vis forfatter(e) (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". .
  • Vis forfatter(e) (1991). "Piezoelectric transducer modelling. Thickness mode vibration". .
  • Vis forfatter(e) (1991). "Piezoelectric transducer modelling. Part 1: Basic equations for poled ferroelectric ceramics". .
  • Vis forfatter(e) (1990). "Shallow seismics using parametric acoustic sources". .
  • Vis forfatter(e) (1990). "Aluminium elektrolysecelle. Ultralydmåling av sjikttykkelser. Akustisk transmisjon i flytende kryolitt". .
  • Vis forfatter(e) (1989). "Shallow gas detection with a parametric seismic source. Phase 1: Feasibility study. Part 2: Technological basis for realization". .
  • Vis forfatter(e) (1989). "Presisjons ultralyd gass-strømningsmåler. Del 2 - Utvikling og konstruksjon. Rammespesifikasjoner for akustiske transdusere i en flerstråle ultralyd gasstrømningsmåler. Teknisk notat nr. 2.1". .
  • Vis forfatter(e) (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". .
  • Vis forfatter(e) (1989). "Permanent multilayer well monitoring. A study of a down-hole instrumentation system for oil and gas production wells". .
  • Vis forfatter(e) (1989). "Aluminium elektrolysecelle. Ultralydmålinger av sjikttykkelser. Forprosjekt". .
  • Vis forfatter(e) (1988). "Shallow gas detection with a parametric seismic source. Phase I: Feasibility study. Part 1". .
  • Vis forfatter(e) (1988). "High precision ultrasonic flowmeter. Sensitivity study. Volume II". .
  • Vis forfatter(e) (1988). "High precision ultrasonic flowmeter. Sensitivity study. Volume I". .
  • Vis forfatter(e) (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). .
  • Vis forfatter(e) (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). .
  • Vis forfatter(e) (1986). "Simuleringsprogrammet CAPROS Versjon 1.0. Programvaredokumentasjon". .
  • Vis forfatter(e) (1986). "Simuleringsprogrammet CAPROS Versjon 1.0. Brukarinstruksjon". .
  • Vis forfatter(e) (1986). "Lydforplantning fra seismisk kildearray. Simuleringsmodellen CAPROS". .
  • Vis forfatter(e) (1986). "High precision ultrasonic gas flowmeters. Feasibility study". .
Faglig foredrag
  • Vis forfatter(e) (2020). Thickness resonances and dispersion properties of leaky Lamb modes in a steel plate.
Vitenskapelig foredrag
  • Vis forfatter(e) (2022). Ultrasonic beam transmission through a water-immersed steel plate in the vicinity of the ZGV angle.
  • Vis forfatter(e) (2022). Energy-flux density in real-, imaginary-, and complex-valued branches of Lamb modes in an isotropic plate.
  • Vis forfatter(e) (2021). Ultrasonic beam radiation from piston source through water-immersed steel plate using ASM. Pressure-to-pressure transfer function and numerical challenges.
  • Vis forfatter(e) (2021). Diffraction correction for precision measurements of sound velocity in gas. Is full receiver modelling needed?
  • Vis forfatter(e) (2021). Complex dispersion properties of lossy and leaky Lamb modes related to Poisson's ratio.
  • Vis forfatter(e) (2020). Nearfield effects from leaky Lamb modes in a steel plate for normal beam incidence.
  • Vis forfatter(e) (2020). Complex dispersion properties of Lamb modes vs. Poisson’s ratio.
  • Vis forfatter(e) (2019). Characterization of ultrasound transmit-receive measurement systems in air. Comparison with prior work on piezoelectric elements in radial mode vibration.
  • Vis forfatter(e) (2018). Transmission through an isotropic viscoelastic water-coupled plate using a transmit-receive transducer system.
  • Vis forfatter(e) (2018). Comparison of angular spectrum models for baffled piston sound field with finite receiver apertures.
  • Vis forfatter(e) (2017). Vibration of a baffled piezoelectric ceramic circular disk in lower radial modes, with near- and farfield sound radiation.
  • Vis forfatter(e) (2017). Sound field radiation from a non-uniformly vibrating baffled and circular piezoelectric ceramic disk in radial mode vibration.
  • Vis forfatter(e) (2017). Finite aperture effects in the backward wave propagation region of a leaky Lamb mode at normal beam incidence.
  • Vis forfatter(e) (2017). Dispersion properties of Lamb and leaky Lamb modes in elastic and viscoelastic plates.
  • Vis forfatter(e) (2016). Transducer finite aperture effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence.
  • Vis forfatter(e) (2015). "Reciprocity calibration method for ultrasonic piezoelectric transducers in air. Comparison of finite element modelling and experimental measurements".
  • Vis forfatter(e) (2015). "Characterization of ultrasound transmit-receive measurement systems in air. Comparison of finite element modelling and experimental measurements".
  • Vis forfatter(e) (2015). "Beam transmission of water-embedded steel plate at normal incidence. Diffraction effects in the S1 to A3 region”.
  • Vis forfatter(e) (2014). Updated results on finite element modeling of a transmit-receive ultrasound measurement system. Comparison with experiments in air.
  • Vis forfatter(e) (2013). Ultrasonic beam transmission through a steel plate at oblique incidence: Uniform piston vs. piezoelectric transducer.
  • Vis forfatter(e) (2013). Reciprocity calibration method for ultrasonic, piezoelectric transducers in air, including finite element simulations.
  • Vis forfatter(e) (2013). "Reciprocity calibration method for ultrasonic piezoelectric transducers in air”.
  • Vis forfatter(e) (2013). "Interaction of a transducer excited ultrasonic beam with an elastic plate. 3D modeling in comparison with experiments”.
  • Vis forfatter(e) (2013). "Industrial ultrasound research at UiB/IFT. From gas flow measurement to structural monitoring".
  • Vis forfatter(e) (2013). "Finite element modeling of ultrasound measurement systems for gas. Use of a full receiver description in comparison with spherical reciprocity”.
  • Vis forfatter(e) (2013). "Finite element modeling of ultrasound measurement systems for gas. System model compared to measurements”.
  • Vis forfatter(e) (2012). "Ultrasonic beam transmission through a water-immersed plate at oblique incidence using a piezoelectric source transducer. Finite element - angular spectrum modeling and measurements”.
  • Vis forfatter(e) (2012). "Normal incidence ultrasonic beam transmission through a water-immersed plate using a piezoelectric source transducer. Finite element modeling, angular spectrum method and measurements".
  • Vis forfatter(e) (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.
  • Vis forfatter(e) (2011). Finite element analysis of acoustic beam interactions with a plate at normal incidence. Comparison with a 3D angular spectrum method and measurements.
  • Vis forfatter(e) (2011). Diffraction correction in ultrasonic fields for measurements of sound velocity in gas. Conventional and alternative methods.
  • Vis forfatter(e) (2011). 'Generalized Permittivity' and Source Sensitivity of Piezoelectric Ceramic Disks.
  • Vis forfatter(e) (2010). Modal and direct harmonic solution methods in FE modeling of piezoceramic disks.
  • Vis forfatter(e) (2010). "Ultrasonic piezoceramic transducers for air, - finite element analysis and measurements".
  • Vis forfatter(e) (2010). "Finite element analysis and measurement of ultrasonic piezoceramic transducers in air and water".
  • Vis forfatter(e) (2009). Finite Element Studies of Permittivity Constants in Piezoceramic Disks.
  • Vis forfatter(e) (2009). "Nonlinear sound propagation fisheries research echo" sounders (abstract).
  • Vis forfatter(e) (2008). "Ultrasonic signal transmission in plates. Study of a steel plate immersed in water".
  • Vis forfatter(e) (2008). "Nonlinear sound propagation fisheries research echo sounders".
  • Vis forfatter(e) (2007). Developments in transducer technology and reciprocity in ultrasonic flow meters.
  • Vis forfatter(e) (2007). "Reciprocal operation of ultrasonic flow meters: Criteria and applications".
  • Vis forfatter(e) (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".
  • Vis forfatter(e) (2006). "Reciprocity in electroacoustic measurement systems, and reciprocal operation: Principles and applications to ultrasonic flow metering".
  • Vis forfatter(e) (2006). "Developments in transducer technology and reciprocity in ultrasonic flow meters".
  • Vis forfatter(e) (2006). "Developments in transducer technology and reciprocity in ultrasonic flow meters".
  • Vis forfatter(e) (2005). Consequences of non-linear sound propagation on target strength measurements - preliminary studies.
  • Vis forfatter(e) (2005). "Reciprocity and its utilization in ultrasonic flow meters".
  • Vis forfatter(e) (2005). "Quantification of nonlinear sound propagation effects in fisheries research echo sounders".
  • Vis forfatter(e) (2005). "Nonlinear sound propagation effects in fisheries research echo sounders - Measurements and simulations in fresh water".
  • Vis forfatter(e) (2005). "Nonlinear effects in fisheries and research echo sounders and sonars".
  • Vis forfatter(e) (2005). "Nonlinear effects in a 200 kHz sound beam".
  • Vis forfatter(e) (2005). "Investigation of precision sound velocity measurements as reference for ultrasonic gas flow meters".
  • Vis forfatter(e) (2005). "Finite element modeling of sound propagation from a piezoelectric transducer through an elastic layer".
  • Vis forfatter(e) (2005). "Electrical and acoustical response of of a Pz27 piezoelectric ceramic element in air. Finite element analyses and experimental results".
  • Vis forfatter(e) (2004). "Transient diffraction effects in piezoelectric ultrasonic transducers using finite element modelling".
  • Vis forfatter(e) (2004). "Methods for precision sound velocity measurements in pressure cells for gas characterization".
  • Vis forfatter(e) (2004). "Finite element modelling of piezoelectric ultrasonic transducer properties in natural gas".
  • Vis forfatter(e) (2004). "Convergence and accuracy of the Bergen Code for investigating nonlinear effects in fishery echo sounders".
  • Vis forfatter(e) (2003). "Transient diffraction effects in ultrasonic meters for volumetric, mass and energy flow measurement of natural gas".
  • Vis forfatter(e) (2003). "Transient diffraction effects in ultrasonic flow meters for gas and liquid".
  • Vis forfatter(e) (2003). "Signal modelling using the FLOSIM system model in ultrasonic instrumentation for industrial applications".
  • Vis forfatter(e) (2002). "Endelig element modellering av piezoelektriske transduser vibrasjoner".
  • Vis forfatter(e) (2001). "A ray theory approach to investigate the influence of flow velocity profiles on transit times in ultrasonic flow meters for gas and liquid".
  • Vis forfatter(e) (2000). "Finite element modeling of piezoceramic disks including radiation into a fluid medium".
  • Vis forfatter(e) (2000). "Challenges for improved accuracy and traceability in ultrasonic fiscal flow metering".
  • Vis forfatter(e) (2000). "Challenges for improved accuracy and traceability in ultrasonic fiscal flow metering of natural gas".
  • Vis forfatter(e) (1999). “Investigation of acoustic properties in wet gas for ultrasonic flowmetering”.
  • Vis forfatter(e) (1999). "FE simulations of piezoceramic disks with a front layer of varying thickness".
  • Vis forfatter(e) (1998). “Piezoelectric disks with a front layer. Comparisons of FEM with experimental data”.
  • Vis forfatter(e) (1997). "FEM analysis of piezoelectric disks - Method and testing".
  • Vis forfatter(e) (1996). Transit time determination in a measurement system, with effects of transducers.
  • Vis forfatter(e) (1995). "Modelling of loss effects in piezoceramic materials, and adaptation to measurements on radial and thickness modes in thin disks".
  • Vis forfatter(e) (1994). "Comparison of models for radial and thickness modes in piezoceramic disks".
  • Vis forfatter(e) (1990). "Aspects of transducer modelling".
  • Vis forfatter(e) (1989). "Ultrasonic pulse propagation in stratified multiphase media".
  • Vis forfatter(e) (1989). "The interaction of seismic waves with shallow gas structures".
  • Vis forfatter(e) (1989). "Pulse generation using a parametric source".
  • Vis forfatter(e) (1988). "Signalbehandling i parametriske antenner".
  • Vis forfatter(e) (1988). "Parametrisk lydkilde. Optimalisering".
  • Vis forfatter(e) (1988). "Numerical simulation of ultrasonic flowmeters".
  • Vis forfatter(e) (1988). "High resolution shallow seismic surveying using parametric acoustic source technology".
  • Vis forfatter(e) (1988). "Full wave simulation of multilayer reflection coefficients in shallow seismics".
  • Vis forfatter(e) (1987). "Utvikling av akustiske transdusere for gass-strømmåling".
  • Vis forfatter(e) (1987). "Simuleringsverktøy for ultralyd væske og gasstrømningsmåling".
  • Vis forfatter(e) (1987). "Simulering av full-bølge lydforplantning i marin seismikk".
  • Vis forfatter(e) (1987). "Numerical simulation of ultrasonic flowmeters".
  • Vis forfatter(e) (1987). "Full wave elastic modelling for seismic detection of shallow gas".
  • Vis forfatter(e) (1987). "Full bølgje FFP simulering for seismisk gasslommedeteksjon".
  • Vis forfatter(e) (1986). "Tredimensjonal FFP modellering av elastiske bølgjer i horisontalt stratifiserte media".
Vitenskapelig antologi/Konferanseserie
  • Vis forfatter(e) (2000). "GERG project on ultrasonic gas flow meters, Phase II. GERG Technical Monograph TM11. Groupe Européen de Recherches Gazières". VDI Verlag.
Hovedfagsoppgave
  • Vis forfatter(e) (1997). "Endelig element modellering av piezoelektriske skiver" (Cand. Scient. thesis).
  • Vis forfatter(e) (1994). "Utnyttelse av resonansmodi i ultralyd transduserkonstruksjonar" (Cand. Scient. thesis).
Mastergradsoppgave
  • Vis forfatter(e) (2023). Normally incident ultrasonic beam transmission through a water-embedded steel plate as a function of ka-number. Master thesis.
  • Vis forfatter(e) (2023). Finite element modelling, construction and experimental characterization of piezoelectric transducers for gas. Master thesis.
  • Vis forfatter(e) (2022). Underwater ultrasonic transducer technology. Construction, characterization and finite-element modelling. Master thesis.
  • Vis forfatter(e) (2022). Finite element modeling and experimental characterization of piezoelectric ceramic disk in air. Master thesis.
  • Vis forfatter(e) (2022). An analysis on material constants estimation for the low characteristic impedance piezoceramic Pz37HD using measurements and FEM modeling. Master thesis.
  • Vis forfatter(e) (2021). Characterization and finite element modelling of piezoelectric ceramic discs vibrating in air, for a frequency range including the first two radial modes. Master thesis.
  • Vis forfatter(e) (2020). Normal incidence ultrasonic beam transmission through steel plates. Measuring and modelling the transmission coefficient. Master thesis.
  • Vis forfatter(e) (2019). Ultrasonic measurement system for gas. Experimental and theoretical characterization using piezoelectric elements at radial mode vibration in air. Master thesis.
  • Vis forfatter(e) (2019). Lydhastighetsmålinger med og uten resonanseffekter i en viskoelastisk stålplate i vann. Master thesis.
  • Vis forfatter(e) (2018). Beam diffraction effects in guided-wave transmission of fluid embedded elastic plate. Influence of receiver distance and finite aperture. Master thesis.
  • Vis forfatter(e) (2017). Ultrasonic measurement systems with diffraction correction for gas: Master thesis.
  • Vis forfatter(e) (2015). Ultrasonic measurement systems for gas. Finite element modelling compared with measurements in air. Master thesis.
  • Vis forfatter(e) (2015). Reciprocity calibration of ultrasonic piezoelectric disks in air. Master thesis.
  • Vis forfatter(e) (2013). Reciprocity calibration method for ultrasonic piezoelectric transducers in air. (Master thesis).
  • Vis forfatter(e) (2013). Finite element modeling of ultrasound measurement systems for gas. Comparison with experiments in air. (Master thesis).
  • Vis forfatter(e) (2009). Undersøkelser av piezokeramiske skiver. Målinger og endelig element analyser.
  • Vis forfatter(e) (2009). Bestemmelse av egenskaper til piezoelektriske skiver med lavt diameter/tykkelse forhold.
  • Vis forfatter(e) (2007). Radiellmode Svingninger i Piezoelektriske Ultralydtransdusere for Luft. Målinger og Endelig Element Analyser.
  • Vis forfatter(e) (2005). "Undersøkelse og utnyttelse av svingemoder i ultralyd tranduserkonstruksjon" (Master thesis).
Doktorgradsavhandling
  • Vis forfatter(e) (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 .
  • Vis forfatter(e) (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).
  • Vis forfatter(e) (2007). Acoustic measurement of liquid density with applications for mass measurement of oil.
  • Vis forfatter(e) (2007). "Sound velocity cell for gas characterization" (PhD thesis).
  • Vis forfatter(e) (2006). "Effects of nonlinear sound propagation in fisheries research" (PhD thesis).
  • Vis forfatter(e) (2000). Finite Element Modeling of Ultrasonic Piezoelectric Transducers. Influence of geometry and material parameters on vibration, response functions and radiated field.
  • Vis forfatter(e) (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
  • Vis forfatter(e) (2011). Diffraction correction for precision measurements of sound velocity in gas. Use of an alternative method for non-uniform piezoelectric transmitting transducer vibration (Poster).
  • Vis forfatter(e) (2005). Ikkelineær lydforplantning ved bruk av ekkolodd i firskeriforvaltning.
  • Vis forfatter(e) (2005). "Investigation of precision sound velocity measurement methods as reference for ultrasonic gas flow meters".

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