19 September 2016 Optical intensity scintillation in the simulated atmospherical environment
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Abstract
There are several parameters of the atmospheric environment which have an effect on the optical wireless connection. Effects like fog, snow or rain are ones of the effects which appears tendentiously and which are bound by season, geographic location, etc. One of the effects that appear with various intensity for the whole time is airflow. The airflow changes the local refractive index of the air and areas with lower or higher refractive index form. The light going through these areas refracts and due to the optical intensity scintillates on the detector of the receiver. The airflow forms on the basis of two effects in the atmosphere. The first is wind cut and flowing over barriers. The other is thermal flow when warm air rises to the higher layers of the atmosphere. The heart of this article is creation such an environment that will form airflow and the refractive index will scintillate. For the experiment, we used special laboratory box with high-speed ventilators and heating units to simulate atmospheric turbulence. We monitor the impact of ventilator arrangement and air temperature on the scintillation of the gas laser with wavelength 633 nm/15 mW. In the experiment, there is watched the difference in behavior between real measurement and flow simulation with the same peripheral conditions of the airflow in the area of 500 x 500 cm.
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Lukas Hajek, Lukas Hajek, Jan Latal, Jan Latal, Ales Vanderka, Ales Vanderka, Jan Vitasek, Jan Vitasek, Marian Bojko, Marian Bojko, Lukas Bednarek, Lukas Bednarek, Vladimir Vasinek, Vladimir Vasinek, } "Optical intensity scintillation in the simulated atmospherical environment", Proc. SPIE 9979, Laser Communication and Propagation through the Atmosphere and Oceans V, 997915 (19 September 2016); doi: 10.1117/12.2237969; https://doi.org/10.1117/12.2237969
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