Cross-Sectional Measuring of Optical Beam

David, Tomas; Látal, Jan; Hanacek, Frantisek; Koudelka, Petr; Vitasek, Jan; Šiška, Petr; Skapa, Jan; Vašinek, Vladimír

doi:10.15598/aeee.v9i4.538

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…Random beam deflections lead to an increase in bit error rate or even to a complete loss of signal [1][2][3][4][5][6]. Turbulence in the atmosphere are very unstable pockets of different sizes and densities unstable in time, continuously forming, changing and disappearing.…”

Section: $Wprvskhulf Wxuexohqfhmentioning

confidence: 99%

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Numerical models and experiment of air flow in a simulation box for optical wireless communications

Látal

Hajek

Bojko

et al. 2016

EPJ Web of Conferences

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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.

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Section: $Wprvskhulf Wxuexohqfhmentioning

confidence: 99%

“…Another method which is focused on the determination of turbulent attenuation is called the method of available power. It is used for the sources with a Gaussian distribution of the optical intensity in the plane perpendicular to the direction of propagation [1][2][3][4][5][6].…”

Section: The Diameter Of the Beam Is Larger Than The Turbulencementioning

confidence: 99%

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Látal

Hajek

Bojko

et al. 2016

EPJ Web of Conferences

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“…This device was manufactured by Festo for movement in two axes with stepper motors. The longer arm of this device is 180 cm long, therefore only a part of optical intensity distribution around the maximum was measured [6]. The measurement was done on 25th April 2011, at 21:00 in following conditions: temperature 11.7 °C, humidity 77 %, southeast wind 0.03 m·s -1 , pressure 1017.8 hPa.…”

Section: Professional Fso Link Mrvmentioning

confidence: 99%

Misalignment loss of Free Space Optic link

Vitasek

Leitgeb

David

et al. 2014

2014 16th International Conference on Transparent Optical Networks (ICTON)

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This article deals with few described loss which can appear in Free Space Optic (FSO) link. It is a misalignment loss which comes on by inaccurate installation of FSO heads. A calculation of this loss is based on power budget. The calculation of misalignment loss was done for professional FSO link which is installed in campus of VSB-Technical University of Ostrava. Results showed that a small misalignment from a straight line causes relatively great misalignment loss.

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“…The fiber optic systems replace the current cable communications because of its advantages and recently wireless optical links are used more often. These communication systems use a laser source that generates electromagnetic waves with Gaussian intensity distribution in the plane perpendicular to the propagation direction [1], [2], [3].…”

Section: Introductionmentioning

confidence: 99%

“…Phenomena such as wind turbulence, absorption, aerosol, mist, insects or birds can cause a decline or disappearance of the signal level or change of the beam spatial coherence. For this reason is necessary thoroughly study of location where is wireless optical link installed to prevent or reduce the degrading influence of the environment on the optical beam [1], [2], [3]. This paper deals possibility of using simulation software ANSYS Fluent 14, which is used for simulating fluid dynamics by using finite volume method (FVM) for numerical modeling of turbulent flow.…”

Section: Introductionmentioning

confidence: 99%

Modelling of airflow in a closed simulation box with regard to atmospheric optical link

Hajek

Látal²,

Bojko³

et al. 2014

EPJ Web of Conferences

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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-İ and k-Ȧ 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.

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Cross-Sectional Measuring of Optical Beam

Cited by 11 publications

References 10 publications

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Numerical models and experiment of air flow in a simulation box for optical wireless communications

Misalignment loss of Free Space Optic link

Modelling of airflow in a closed simulation box with regard to atmospheric optical link

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