Hjem
Universitetet i Bergen
Elektronikk og Måleteknologi

Utvalgte tidsskriftsartikler

Utvalgte publikasjoner

Hovedinnhold

Bøker (Books)

  • Johansen G A and Jackson P Radioisotope gauges for industrial process measurements ISBN 0-471-48999-9, John Wiley & Sons, Ltd. (2004) 336 pp.

 

Utvalgte tidsskriftsartikler (Selected journal publications)

  • Hjertaker B T, Tjugum S-A, Hammer E A and Johansen G A Multi modality tomography for multiphase hydrocarbon flow Submitted to IEEE Sensors Journal.

  • Holstad M B, Robins L, Jackson P and Johansen G A Scattered gamma radiation utilised to measure remnant fresh absorbent in absorbent beds Submitted to Meas. Sci. & Technol.

  • Holstad M B, Johansen G A, Jackson P and Eidsnes K S Scattered gamma radiation utilised for level measurements in gravitation separators Submitted to IEEE Sensors Journal.

  • Tjugum S-A, Johansen G A and Frieling J A multiple voxel model for scattered gamma radiation in pipe flow Meas. Sci. & Technol. 14 No 10 (2003) 1777-1782.

  • Tjugum S-A, Frieling J and Johansen G A A compact low-energy multibeam gamma-ray densitometer for pipe-flow measurements Nucl. Instr. & Meth. B 197 (2002) 301-309.

  • Tjugum S-A, Hjertaker  B T and Johansen G A Multiphase flow regime identification by multibeam gamma-ray densitometry Meas. Sci. & Technol. 13 (2002) 1319-1326.

  • Mwambela A J and Johansen G A Multiphase flow component volume fraction measurement: experimental evaluation of entropic thresholding methods using an electrical capacitance tomography system Meas. Sci. & Technol. 12 No.8 (2001) 1092-1101.

  • Hjertaker B T, Johansen G A and Jackson P Level Measurement and Control Strategies for Subsea Separators Journ. Electr. Imaging 10 No.3 (2001) 679-689.

  • Tjugum, S-A and Johansen G A The use of gamma-radiaiton in fluid flow measurements Rad. Phys & Chem 61 (2001) 797-798.

  • Johansen GA and Jackson P Salinity independent measurement of gas volume fraction in oil/ gas/water pipe flows Appl. Rad. and Isotopes 53 No. 4-5 (2000) 595-601.

  • Åbro E, Khoryakov V A, Johansen G A and Kocbach L Determination of void fraction and flow regime using neural network trained on simulated data based on gamma-ray densitometry Meas. Sci. & Technol. 10 (1999) 619-630.

  • Åbro E and Johansen G A Improved void fraction determination by means of multibeam gamma-ray attenuation measurements Flow Meas & Instr. 10 (1999) 99-108.

  • Åbro E , Johansen G.A and Opedal H A radiation transport model as a design tool for gamma densitometers Nucl. Instr. & Meth A431 (1999) 347-355.

  • Folgerø K Broad-band dielectric spectroscopy of low-permittivity fluids using one measurement cell 47 No. 4 (1998) 881-885.

  • Hilland J and Friisø T Evaluation of modelling routines for on-line implementation of the open ended coaxial probe Meas. Sci. Techn., 9 (1998) 790-796.

  • Hjertaker BT Static characterization of a dual sensor flow imaging system Flow Meas. Instr. 9 (1998) 183-191.

  • Tollefsen J and Hammer E A Capacitance sensor design for reducing errors in phase concentration measurements Flow Meas. Instr. 9 (1998) 25-32.

  • Friisø T, Schildberg Y, Odile R, Tjomsland T, Førdedal H and Sjøblom J Complex permittivity of crude oils and solutions of heavy crude oil fractions J. Disp. Sci. Techn. 19 (1998) 93-126.

  • Friisø T and Tjomsland T Monitoring of density changes in low-permittivity liquids by microwave permittivity measurements with an open-ended probe Meas. Sci. Technol. 8 (1997) 1295- 1305.

  • Noertemann K, Hilland J and Kaatze U Dielectric properties of aquaous NaCl solutions at microwave frequencies Journal of Physical Chemistry 101 (1997) 6864-6869.

  • Hammer E A and Johansen G A Process Tomography in the Oil Industry - State of the art and Future Possibilities Measurement+Control 30 No. 7 (1997) 212-216.

  • Thorn R, Johansen G A and Hammer E A Recent Developments in Three-Phase Flow Measurement Meas. Sci. Technol. 8 (1997) 691-701.

  • Hilland J Simple sensor system for measuring the dielectric properties of saline solutions Meas. Sci. Technol. 8 (1997) 901-910.

  • Jakobsen T and Folgerø K Dielectric spectroscopy measurements on gas hydrate formation in water-in-oil emulsions with open-ended coaxial probes Meas. Sci. Technol. 8, (1997) 1006- 1015.

  • Mwambela A J, Isaksen Ø and Johansen G A The use of entropic thresholding methods in reconstruction of capacitance tomography data. Chem. Eng. Sci. 52, No. 13 (1997) 2149-2159.

  • Johansen G A, Frøyen S and Hansen T E Gamma-ray detection with an UV-enhanced photodiode and scintillation crystals emitting at short wavelengths. Nucl. Instr. Meth. A387 (1997) pp. 239-242.

  • Tjomsland T, Hilland J, Christy A A, Sjøblom J, Riis M, Friisø T, Folgerø K Comparison of infrared and impedance spectra of petroleum fractions Fuel 75 No 3 (1996) pp. 322-332.

  • Folgerø K and Tjomsland T Permittivity measurement of thin liquid layers using open-ended coaxial probes Meas. Sci. Technol. 7 (1996) pp. 1164-1173.

  • Folgerø K Bilinear calibration of coaxial transmission/reflection cells for permittivity measurement of low-loss liquids Meas. Sci. Technol. 7 (1996) pp. 1260-1269.

  • Åbro E and Johansen G A Low noise gamma-ray and X-ray detectors based on CdTe-materials. Nucl. Instr. Meth. A377 (1996) pp. 470-474.

  • Johansen G A and Åbro E A new CdZnTe detector system for low energy gamma-ray measurement. Sensors and Actuators A54 (1996) pp. 493-498.

  • Johansen G A, Frøystein T, Hjertaker B T and Olsen Ø A dual sensor flow imaging tomographic system. Meas. Sci. Techn. 7, No. 3 (1996) pp. 297-307.

  • Folgerø K, Friisø T, Hilland J and Tjomsland T A broad band and high-sensitivity dielectric spectroscopy measurement system for quality determination of low-permittivity fluids Meas. Sci. Technol. 6 (1995) 995-1008.

  • Johansen G A, Frøystein T, Hjertaker B T, Isaksen Ø, Olsen Ø, Strandos S K, Skoglund T O, Åbro E and Hammer E A: The development of a dual-mode tomograph for three-component flow imaging. The Chemical Engineering Journal 56, No. 2 (1995) pp. 175-182.

  • Vold Per, Johansen Geir A, Nordtvedt Jan-Erik ElPed: Et interaktivt PC-basert læringsprogram for elektriske kretser Nytt om data i skolan, 2 (1994) 30-36.

  • Isaksen Ø, Dico A S and Hammer E A: A Capacitace-based tomography system for interface measurement in separation vessels. Measurement Science and Technology, 5, No. 10 (1994) 1262-1271

  • Isaksen Ø andNordtvedt J E A New Reconstruction Algorithm for Use with Capacitance Based Process Tomography MIC, 15, No. 1 (1994) 9-22.

  • Johansen G A and Frøystein T Detectors for gamma-ray flow imaging. Flow Measurement and Instrumentation, 5, No.1 (1994) 15-21.

  • Johansen G A, Nordtvedt J E, Vold P ElPed: An interactive PC-based learning program for basic electrical circuits. Computers in Physics, 7, No. 5 (1993) 577-584.

  • Isaksen Ø and Nordtvedt J E A New Reconstruction Algorithm for Process Tomography Measurement Science and Technology, 4, No. 12 (1993) 1464-1475.

  • Johansen G A and Johnson C B Operational characteristics of an electron-bombarded silicon- diode photomultiplier tube. Nucl. Instr. and Meth., A326 (1993) 295-298.

  • Hammer E A, Tollefsen J and Olsvik K Capacitance Transducers for Non-Intrusive Measurement of Water in Crude Oil. Flow Meas. and Instr., 1 (1989).

01.02.2009