Mr. Bogdan J. Rosa Profile

Bogdan J. Rosa

at Univ Warszawski

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Author

Publications (5)

Proceedings Article | 14 October 2005 Paper

Simulation and analysis of dynamic heating in the ultrafast aircraft thermometer measurements

Bogdan Rosa, Konrad Bajer, Krzysztof Haman, Tomasz Szoplik

Proceedings Volume 5981, 598102 (2005) https://doi.org/10.1117/12.627038

KEYWORDS: Sensors, Temperature metrology, Ultrafast phenomena, Ultrafast measurement systems, Clouds, Numerical simulations, Diffusion, Particles, Thermal effects, Fluid dynamics

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Proceedings Article | 11 November 2004 Paper

Optimization of the atmospheric temperature field measurements

Bogdan Rosa, Konrad Bajer, Krzysztof Haman, Tomasz Szoplik

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.565246

KEYWORDS: Temperature metrology, Clouds, Resistance, Turbulence, Spatial resolution, Atmospheric optics, Atmospheric propagation, Aerodynamics, Sensors, Geophysics

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Small-scale inhomogeneities of the atmospheric temperature field are caused by air turbulence and result in refractive index fluctuations, which in turn influence the propagation of optical beams. Understanding small density fluctuations in the atmosphere is important for the free-space laser communication and for high-resolution imaging through the atmosphere. The ultra-fast aircraft resistance thermometer constructed in the Institute of Geophysics, Warsaw University, measures the temperature of cloudless air and of warm clouds with 10 kHz sampling frequency. During a flight at the speed of 100 m/s, at low altitudes up to 2 km, this corresponds to the spatial resolution of the order of one centimeter. This resolution is sufficient for studying small density fluctuations in the atmospheric boundary layer. A streamlined shield protects the sensing wire of the thermometer from cloud droplets and other small particles suspended in the air but introduce aerodynamic disturbances in the form of vortices. The thermometer records the resulting fluctuations of temperature as noise. The shield sucks air and water collected on its surface through the suction slits. This suction also suppresses the disturbances. In this paper we analyze how the temperature measurements are influenced by: (i) turbulence generated behind the shield placed in front of the sensing wire; (ii) suction of air through the shield slits; (iii) cloud droplets of various space distributions, masses and velocities. We have carried out the 2D numerical simulations of the time-dependent, incompressible, viscous flow (the Navier-Stokes equation) around the shield placed in a uniform stream. We solved the particle path equations for an ensamble of droplets in the Stokes approximation. All the simulations are oriented toward optimization of the shield shape in order to (i) reduce noise in measurements at low and high altitudes and (ii) protect the sensing wire against ice crystals in flights at high altitudes.

Proceedings Article | 6 February 2004 Paper

Visualization of small density fluctuations of the atmosphere with spatial frequency filters

Bogdan Rosa, Arkadiusz Sagan, Krzysztof Haman, Tomasz Szoplik

Proceedings Volume 5237, (2004) https://doi.org/10.1117/12.509599

KEYWORDS: Phase shifts, Visualization, Spatial filters, Turbulence, Resistance, Optical filters, Protactinium, Linear filtering, Spatial frequencies, Ultrafast phenomena

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Proceedings Article | 21 November 2003 Paper

Visualization of phase objects with real semiderivative and schlieren filters: a comparison

Slawomir Nowicki, Arkadiusz Sagan, Bogdan Rosa, Ryszard Buczynski, Marek Kowalczyk, Tomasz Szoplik

Proceedings Volume 5259, (2003) https://doi.org/10.1117/12.545099

KEYWORDS: Optical filters, Phase shifts, Visualization, Phase shift keying, Image filtering, Transmittance, Spatial frequencies, Modulation, Imaging systems, Diffraction

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Proceedings Article | 19 January 2001 Paper

Semiautomatic preparation of a 3D terrain model based on hand-drawn topographical maps

Jacek Pniewski, Bogdan Rosa, Tomasz Szoplik

Proceedings Volume 4170, (2001) https://doi.org/10.1117/12.413905

KEYWORDS: 3D modeling, Lithium, Digital Light Processing, Image processing, Signal processing, Remote sensing

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