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Tonni Franke Johansen

Research Scientist

Tonni Franke Johansen

Research Scientist

Tonni Franke Johansen
Phone: 404 72 793
Department: Connectivity Technologies and Platforms
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1674875

Three common piezoelectric materials have been studied for use in pulsed wave Doppler ultrasound, where high sensitivity is required, while bandwidth is less important. A large transducer aperture, 80 mm 2 , results in a low electrical impedance, making the transducers challenging to drive with conv...

Authors Bolstad Per Kristian Hoff Lars Torp Hans Johansen Tonni Franke
Year 2018
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1660031

Sealing of new wells, and the increasing need of plug and abandonment (P&A) of old wells, has triggered research and development of new methods for saving time at this operation. Shale has proven to seal off the annulus in longer well sections; however, the detection and qualification of the sea...

Year 2018
Type Conference lecture and academic presentation
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1631977

Ultrasonic tools are being used for imaging in a large variety of fields, spanning from medical applications in a hospital to applications deep down in oil and gas wells. When applying ultrasonic imaging techniques to image through elastic materials, such as steel, one of the main challenges these t...

Authors Talberg Andreas Sørbrøden Johansen Tonni Franke Måsøy Svein-Erik Rommetveit Tarjei Brekke Svein Dong Hefeng
Year 2018
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1512031

Verification of annular barriers is essential for well integrity, with ultrasonic methods being central in well integrity testing for many decades. By doing ultrasonic pitch-catch measurements on a bench top laboratory setup developed to replicate an oil well casing, we were able to show that the be...

Authors Talberg Andreas Sørbrøden Johansen Tonni Franke Larsen Idar
Year 2017
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1457451

Dual-frequency band probes are needed for ultrasound (US) reverberation suppression and are useful for image-guided US therapy. A challenge is to design transducer stacks that achieve high bandwidth and efficiency at both operating frequencies when the frequencies are widely separated with a frequen...

Authors Myhre Ola Finneng Johansen Tonni Franke Angelsen Bjørn Atle J.
Year 2017
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1404384

Current methods for ultrasonic pitch-catch well logging use two receivers to log the bonded material outside a single casing. For two casings separated by a fluid, we find by simulation that increasing the number of receivers provides a better picture of the effect of the bonded material outside the...

Authors Viggen Erlend Magnus Johansen Tonni Franke Merciu Ioan Alexandru
Year 2017
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1458103

This article presents a set of acoustic measurements conducted on the Statoil funded Behind Casing Logging Set-Up, designed by SINTEF Petroleum Research to resemble an oil well casing. A set of simple simulations using COMSOL Multiphysics were also conducted and the results compared with the measure...

Authors Talberg Andreas Sørbrøden Johansen Tonni Franke
Year 2016
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1448225

This paper studies a design concept of a dual frequency ultrasonic transducer, in which we use different technologies for each band. A hybrid structure consisting of a piezoelectric stack used for the lower frequency (LF) band and a Capacitive Micromachined Ultrasound Transducer (CMUT) array placed ...

Authors Manh Tung Hoff Lars Eggen Trym Johansen Tonni Franke Lanteri Frederic Gelly Jean-François
Year 2016
Type Journal publication