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Laser Sheet Scattering and the Cameras' Positions in Particle Image Velocimetry

100%
Ilić J., Čantrak D., Srećković M.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1113-1118
EN
Simulations of laser sheet scattering by microparticles, based on the generalized Lorenz-Mie theory for the case of numerous random spatial distributions of scattering particles, were done, using the novel computational time saving strategy. This type of scattering by particles immersed in a fluid flow and its recording on cameras, presents the essence of particle image velocimetry systems. The continuous and large change of the intensity of a scattered light falling on the camera causes the sequences of images of varying quality, which makes many of them useless. This paper shows how the problem could be alleviated by determining the angles of low relative standard deviation of scattered light intensity and using them for recording, as well as by avoiding the angles of high relative standard deviation of scattered light intensity.
2
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Laser-PMMA Interaction and Mechanical Stresses

88%
Kovačević A., Srećković M., Gospavić R., Ristić S., Jovanić P.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
981-986
EN
The polymethylmetacrylate samples were exposed to laser beams of various types of lasers. The modifications of the surfaces of the samples were analyzed by light microscopy and scanning electron microscopy. Numerical approach to thermal distribution for specified power ranges of selected lasers was obtained. The results of polymethylmetacrylate drilling and cutting performed by laser and non-laser means were compared by photoelastic methods.
3
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Laser Interaction with Material - Theory, Experiments and Discrepancies

76%
Srećković M., Ilić J., Davidović M., Djokić B., Tomić Ž., Latinović Z., Družijanić D.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
618-621
EN
The experimental treatment of chosen material with laser beams, starting from continuous wave up to fs pulses, produces the necessity to find the common and sophisticated theoretical approaches to interaction modeling. For chosen materials, some laser treatment and damage analyses are performed. The provoked stresses and parameters of transport processes (penetration depth) are calculated by using the programs for electrical circuit analyses. Some inconsistencies in the treatment of large area laser-material interaction are discussed.
4
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Models of Interactions of Laser Beams with Materials of Interest for Optical Components and Provoked Damages

76%
Srećković M., Ilić J., Kovačević A., Pantelić S., Latinović Z., Borna N., Ćosović V.
Acta Physica Polonica A
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2007
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vol. 112
|
issue 5
935-940
EN
Models of interactions of laser beams with materials of interest for optical components are presented in this paper. Special attention is paid to damages which appear within both active materials and optical components along the path of a propagating beam with theoretical treatment via various models.
5
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Ruby Laser Interaction with Austenite Structural Materials

76%
Milosavljević A., Petronić S., Srećković M., Ristić S., Nešić I., Pljakić R., Negovanović V.
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EN
The investigations were carried out on chrome nickel steel and nickel based superalloy samples thermo-mechanically treated to obtain optimal mechanical properties and surface stability. Chrome nickel steel and a few nickel based superalloys samples were exposed to the laser beam before creep deformation process. The second group of nickel based superalloy samples were exposed after the creep deformation. The damages occurred by exposing of chrome nickel steel and nickel base superalloy samples to the ruby laser were analyzed by scanning electron microscope and energy-dispersive X-ray spectrometry. In this paper, the influence of laser dynamical regime (MW/mm^{2}) to the microstructural changes of heat treated chrome nickel steel and nickel based superalloy are analyzed and discussed.
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