Defence of dissertation in the field of Optical Technology M.Sc. (Tech.) Priit Jaanson
The title of thesis is “Angle-resolved measurements and modelling of diffuse reflectance and luminescence”
The aim of this thesis was to improve the accuracies of measuring angle-resolved reflectance and luminescence of surfaces.
The angle-resolved reflectance measurements were used in an attempt to validate a model, which is used in the process of interpreting satellite based Earth observation data. The light from Sun is transferred through the atmosphere, is scattered from the Earth’s surface and vegetation, and is transferred through the atmosphere again, before reaching the detector on the satellite. In order to interpret the measured values, the scattering in the atmosphere and in the vegetation needs to be taken into account by models. Consequently, these models affect greatly the quality of the satellite-based measurement results and thus the decisions made based on these data.
The angle-resolved measurements of luminescence were used to propose a new type of luminescent reference standard material, which may improve the quality control of products making use of luminescent pigments. Luminescent pigments are used in different fields of science and industry e.g.in paper industry to make paper appear whiter and in textiles and safety signs to make the colors more vibrant and noticeable. With luminescent pigments widely used in many industrial fields, accurate colorimetric measurements of appearance of luminescent surfaces are needed to dose the pigments efficiently. Accurate measurements of luminescence leading to accurate dosing of the pigments may lead to significant savings in the multi-billion-euro pigment industry.
Opponent: Dr. Joanne Zwinkels, National Research Council of Canada (NCR), Canada
Supervisor: Professor Erkki Ikonen, Aalto University School of Electrical Engineering, Department of Signal Processing and Acoustics.