10:30am - 11:00amINVITEDto be announced
Daoxin Dai
Zhejiang University, China, People's Republic of
11:00am - 11:15amExploring and evaluating extremely efficient designs for filter-based spectral modules
Aliaksei Kobylinskiy1,2, Sebastian Henkel1, Marcel Binder1, Xavier Uwurukundo1, Lukas Werner1,2, Hartmut Hillmer2, Jens Bliedtner1, Robert Brunner1,3
1University of Applied Sciences Jena, Carl-Zeiss-Promenade 2, 07745 Jena, Germany; 2Institute of Nanostructure Technologies and Analytics (INA) and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany; 3Fraunhofer Institute for Applied Optics and Precision Engineering (IOF), Albert-Einstein-Straße 7, 07745 Jena, Germany
Filter-based spectral systems are highly competitive due to their compactness, simplicity, and well-defined spectral characteristics. However, their primary drawback remains low detection efficiency. This work explores various strategies to enhance detection efficiency. While an additional row of beamsplitters can significantly improve illumination, alternative folded beam path designs—eliminating the need for beamsplitters—prove to be far more effective. Additionally, a novel approach utilizing a freeform mirror is introduced, enabling differential adjustment of detection efficiency across different spectral regions. For the first time, a comprehensive comparison of these strategies is presented.
11:15am - 11:30amSafe and effective UVB module for integration in office luminaires to support Vitamin D production
Annemieke Wondergem-de Best, Grigory Onushkin, Rémy Broersma
Signify, Netherlands, The
Exposure of the human skin to sunlight is essential for Vitamin D production. Due to our modern indoor lifestyle an increasing part of the population shows insufficient Vitamin D levels, especially in wintertime. Exposure to artificial UVB radiation can help in maintaining a sufficient Vitamin D level. The provided dose should be high enough to be effective, but low enough not to cause damage to skin or eyes. We designed a UVB module for integration in office luminaires that provides a very low UVB irradiance level that leads to an effective dose in a full working day. Ideally, the intensity distribution for a ceiling-mounted UVB module provides a uniform irradiance level on the face and hands of a sitting person. The final design is a balance between UVB LED availability, optical material use, manufacturing considerations, and required light distribution.
11:30am - 11:45amInfrared Thermography of Cement Mortar with Phase Change Fibres
Nathalia Hammes1,2, Vitor M. M. Araújo1, Orlando Lima Jr1,3, Behzad Zahabizadeh4, Vítor M. C. F. Cunha4, Eduardo Pereira4, Aires Camões5, Elina Marinho2, Helena Prado Felgueiras2, Manuel F. M. Costa6, Iran Rocha Segundo7, Joaquim Carneiro1
1Centre of Physics of Minho and Porto Universities (CF-UM-UP), Azurém Campus, University of Minho, Guimarães, Portugal; 2Centre for Textile Science and Technology (2C2T-UMinho), Azurém Campus, University of Minho, Guimarães, Portugal; 3ARISE, Department of Civil Engineering (ISISE-UMinho), Azurém Campus, University of Minho, Guimarães, Portugal; 4ISISE, Institute of Science and Innovation for Bio-Sustainability (IB-S), Department of Civil Engineering, University of Minho, Guimarães, Portugal; 5Centre for Territory, Environment and Construction (CTAC), Department of Civil Engineering, University of Minho, Azurém, Guimarães, Portugal; 6Centre of Physics of Minho and Porto Universities (CF-UM-UP), Gualtar Campus, University of Minho, Braga, Portugal; 7CERIS, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal
Urban Heat Islands (UHIs), aggravated by intense urbanisation and heat-retaining materials from buildings and roads, affect the thermal comfort of human beings. To mitigate this issue, this study aims to study the thermal performance of cement mortars with coaxial polymeric fibres produced by wet spinning and containing polyethylene glycol (PEG 600 and 1000) (CM_PCF) as phase change material. Samples were irradiated with a solar simulation lamp and monitored through infrared imaging and a thermometer. The CM_PCFs showed surface temperature reductions of up to 1°C. The results suggest that the phase change fibres can increase energy efficiency and support sustainable strategies for mitigating UHIS.
11:45am - 12:00pmOptimization of laser-induced printed colors for industrial applications
Robin Mermillot-Blondin1,2, Nicolas Dalloz2, Mathieu Hébert1, Alain Trémeau1, Rémi Emonet1,3,4, Nathalie Destouches1,3
1Univ Lyon, UJM-Saint-Etienne; 2TOPPAN Security SAS; 3Institut Universitaire de France; 4Inria
Laser-induced printing is an affordable, fast, and non-contact method for creating high-resolution images. Using plasmonic nanocomposite thin films, it enables the printing of color images with visual effects. However, the color gamut of these images is limited compared to inkjet printing. Therefore, it is necessary to optimize this gamut in order to print images that contain the widest range of colors and are closest to the original. There is currently no model to directly infer the color from the laser parameters used. Instead, a lookup table is required to associate these parameters with actual colors. Since colors vary depending on the type of sample used, it is essential to have a reliable method to quickly determine the laser parameters that produce the best colors. Two methods have been implemented to optimize the color gamut: a genetic algorithm approach to find colors that both increase both hue diversity and saturation, and a Bayesian approach to increase the size of the color gamut. Gamut mapping is then used to print the image, and the quality of the final printed image is assessed using metrics obtained from a psychophysical study.
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