1. Institute of Sensors, Signals and Electrotechnics (SENSE), The Faculty of Engineering, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
2. Danish Technological Institute, Dept. of Plastics Technology, Taastrup, Gregersensvej 32630 Taastrup, Denmark
3. New Energy Technologies, Department of Applied Physics, Aalto University, P.O. Box 15100, FIN-00076 Aalto, Finland
4. Department of Science, Systems and Models, Roskilde University, 4000 Roskilde, Denmark