Blar i NTNU Open på forfatter "Johnsen, Håkon Jarand Dugstad"
-
A novel prototyping technique for non-imaging optics.
Lerberg, Bjørn Torjus Nygard (Master thesis, 2023)Denne studien undersøker et innovativt alternativ til å direkte 3D-printe non-imaging optiske prototyper. Ved å benytte kommersielt tilgjengelig 3D-printeteknologier og enkle verktøy, presenterer studien en kreativ ... -
Beyond the 2D limit: étendue-squeezing line-focus solar concentrators
Johnsen, Håkon Jarand Dugstad; Aksnes, Astrid; Torgersen, Jan (Peer reviewed; Journal article, 2020)Line-focus solar concentrators are commonly designed by extruding a two-dimensional concentrator in the third dimension. For concentration in air, these concentrators are, by the nature of their design, limited by the ... -
Exploring Gecko-Inspired Dry Adhesion with Consumer-Grade 3D Printing Technology: Design, Prototyping, and Performance Analysis
Stubberud, Vegar (Master thesis, 2023)Denne studien hadde som mål å avgjøre om kommersielt tilgjengelige 3D-printere, i dette tilfellet Prusa SL1S, er egnet for å skape klebende strukturer som etterligner egenskapene gekkoføtter har. Wayfaring metoden resulterte ... -
High-concentration freeform microtracking concentrators with single-axis external tracking
Johnsen, Håkon Jarand Dugstad; Torgersen, Jan (Chapter, 2023)Microtracking concentrators enable the use of concentrator photovoltaics without the need for accurate two-axis external solar tracking. However, the wide tracking range required from stationary microtracking concentrators ... -
High-concentration wide-angle tracking integration with stacked lens arrays
Johnsen, Håkon Jarand Dugstad; Aksnes, Astrid; Torgersen, Jan (Chapter, 2019)Tracking-integration can reduce or eliminate the need for external solar tracking in CPV (concentrator photovoltaics). Previous research has shown how tracking-integrated systems can achieve high concentration ratios, wide ... -
High-performance stationary solar tracking through multi-objective optimization of beam-steering lens arrays
Johnsen, Håkon Jarand Dugstad; Aksnes, Astrid; Torgersen, Jan (Peer reviewed; Journal article, 2020)Beam-steering lens arrays enable solar tracking using millimeter-scale relative translation between a set of lens arrays. This may represent a promising alternative to the mechanical bulk of conventional solar trackers, ... -
In search of a sharper line focus: Rotating the étendue
Johnsen, Håkon Jarand Dugstad; Miñano, Juan Carlos (Journal article; Peer reviewed, 2022) -
Investigating NIR Illumination for Nighttime Bird Tracking with RGB Cameras
Ersdal, Birk Hveding (Master thesis, 2023)Denne masteroppgaven har brukt en wayfaring-tilnærmingen inspirert av Steinert & Leifer i et forsøk på å utvikle en konstandseffektiv metode som bruker kommersielt tilgjengelige RGB-kameraer for å overvåke fugleaktivitet ... -
Line-focus solar concentration 10 times higher than the 2D thermodynamic limit
Johnsen, Håkon Jarand Dugstad; Miñano, Juan Carlos; Torgersen, Jan (Peer reviewed; Journal article, 2022)Line-focus solar concentrators have traditionally been limited by the 2D concentration limit due to the continuous translational symmetry in these systems. This limit is orders of magnitude lower than the 3D limit, severely ... -
New approaches to solar tracking and concentration through numerical optimization of lens arrays
Johnsen, Håkon Jarand Dugstad (Doctoral theses at NTNU;2020:405, Doctoral thesis, 2020)Solar concentrators are essential for enabling several solar energy applications, including high-efficiency photovoltaic conversion and high-temperature solar thermal energy. These concentrators require accurate solar ... -
Novel Low Cost Solar Thermal Energy Concepts for Developing Countries
Johnsen, Håkon Jarand Dugstad (Master thesis, 2017)Small scale solar thermal energy devices such as solar cookers are promising solutions for remote areas where other energy sources are limited, for instance in developing countries. These devices can be used directly for ... -
Pushing the limits of beam-steering lens arrays
Johnsen, Håkon Jarand Dugstad; Aksnes, Astrid; Torgersen, Jan (Journal article; Peer reviewed, 2019)An essential part of a concentrated solar power system is the solar tracker. Tracking is usually implemented by rotating the entire optical system to follow the sun, adding to the bulk and complexity of the system. ... -
Solar tracking using beam-steering lens arrays
Johnsen, Håkon Jarand Dugstad; Torgersen, Jan; Aksnes, Astrid (Chapter, 2018)Conventional tracking solar concentrators track sunlight by rotating the concentrator optics to face the sun, which adds to the cost and bulk of the system. Beam-steering lens arrays, in contrast, allow solar tracking ... -
Topology optimised bolt placements
Steen, Håkon Berger (Master thesis, 2021)This thesis will focus on the use of optimization algorithms to suggest an optimal bolt placement with regards to deflection. The work is inspired by and supposed to be an addition to the design process that Thomas Røkke ...