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296 results on '"Vasinek, Vladimir"'

12. Fluorescent response of dye-filled suspended-core microstructured polymer optical fiber

Author

Vanda, Jan, Skapa, Jan, Vasinek, Vladimir, Argyros, Alex, Large, Marianne, and Lwin, Richard

Subjects
Fiber optics -- Research, Fiber optics -- Equipment and supplies, Fiber optics -- Methods, Fiber optics -- Materials, Fiber optics, Astronomy, Physics
Abstract

Microstructured polymer optical fibers represent quite new technology that is still in the research and development stage. However, some advances and possible applications are available even now. One of these is the possibility of filling the fibers with various fluids to enhance or modify some of their characteristics. Filling fibers with fluorescent dyes is a good method to describe how the filled fiber behaves and to demonstrate sensing applications. OCIS codes: 060.4005, 060.2400.

Published
2009

13. Measurement of the Effect of Luminescent Layer Parameters on Light and Communication Properties

Author

Jargus, Jan, Tomis, Martin, Baros, Jan, Danys, Lukas, Jaros, Rene, Martinek, Radek, Vasinek, Vladimir, and Nedoma, Jan

Abstract

This publication describes the measurement of the effect of selected luminescent layer parameters on the light and communication characteristics of light generated by a luminescent layer using a light-emitting diode (LED) as a radiation source. The luminescent layers were implemented based on a combination of polydimethylsiloxane (PDMS) polymer and YAG:Ce and CaS:Eu phosphors by spin coating. For the chosen weight ratios of PDMS and phosphors, a set of test samples of luminescent layers was implemented whose thicknesses differed from each other in the order of units to tens of micrometers. Experimental measurements have clearly shown that even a slightest change in the thickness of the luminescent layer has a nonnegligible effect on the change of the luminous and communication parameters of the light generated by the luminescent layer. The colorimetric parameters of the color colorimetry temperature (CCT), color rendering index (CRI), and color coordinates $x$ and $y$ [Commission Internationale de l’Eclairage (CIE) 1931] were recorded for the investigated luminescent samples. The communication parameters were evaluated by measuring the error vector magnitude (EVM), modulation error ratio (MER), phase error, bit error rate (BER), and normalized signal-to-noise ratio $E_{b}/N_{0}$ .

Published
2023
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14. Numerical models and experiment of air flow in a simulation box for optical wireless communications

Author

Latal Jan, Hajek Lukas, Bojko Marian, Vitasek Jan, Koudelka Petr, Kepak Stanislav, Vanderka Ales, and Vasinek Vladimir

Subjects
Physics, QC1-999
Abstract

In this article, the authors focused on real measurements of mechanical turbulence generated by ventilators in the simulation box for Optical Wireless Communications. The mechanical turbulences disturb the optical beam that propagates along the central axis of the simulation box. The aim of authors is to show the effect of mechanical turbulence on optical beams at different heights in the simulation box. In the Ansys Fluent, we created numerical models which were then compared with real measurements. Authors compared the real and numerical models according to statistical methods.

Published
2016
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18. Modelling of airflow in a closed simulation box with regard to atmospheric optical link

Author

Hajek Lukas, Latal Jan, Bojko Marian, Poboril Radek, Koudelka Petr, Vitasek Jan, Siska Petr, and Vasinek Vladimir

Subjects
Physics, QC1-999
Abstract

Article is dealing with defining of mathematical turbulent air flow numerical model in the laboratory box with help of ANSYS Fluent software application. The paper describes real measurement of parameters of mechanical turbulences created by high-speed ventilator mounted on the simulation box. The real measurement took place in two planes perpendicular to each other, input and output slot. Subsequently the simulation of mechanical air flow was performed by the help of k-ε and k-ω turbulent models. The results of individual simulations were evaluated by statistical model in the same points, planes respectively, in which the real measurement was made. Other simulation was dealing with effect of heaters inside of closed laboratory box with regards to optical beam degradation. During real measurement was performed temperature point measurement by probe placed inside of the box. The probe was recording air temperature every one second during seven minutes long measurement. The results comparison of simulated and measured data was made in the end. The maximal temperature reached approximately 50 °C in both cases. Also the air flow character in dependence on the number of hot-air extraction ventilators was monitored.

Published
2014
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