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Temperature Dependence Analysis of Mode Dispersion in Step-Index Polymer Optical Fibers

100%
Kovacevic M., Djordjevich A.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 4
649-651
EN
Temperature dependence of the mode dispersion is investigated for commercially available polymethyl methacrylate (PMMA) based step-index polymer optical fibers. An analytical expression is proposed describing the thermal variation of the fiber refractive index. This index decreases with increasing temperature as density of the polymer material drops. The study covered the temperature range from -60°C to 100°C. Results show that the modal dispersion decreases and the bandwidth increases with rising temperature.
2
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Radiation Absorption Characteristics of Titanium Alloys

61%
Stankovic S., Ilic R., Davidovic D., Petrovic M., Tadic S., Kovacevic M.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 4
820-822
EN
Titanium alloys have found numerous applications in space research, and nuclear industry and research. Since X-rays constitute an important part of the space radiation environment, numerical simulations of radiation absorption characteristics of titanium alloys were studied in this paper. The photon transport Monte Carlo software was used for determining the energy deposited in titanium samples. The numerical results show the pronounced dependence of radiation absorption properties of different combinations of components in alloy. The results obtained are encouraging in respect of optimization of structure of alloys regarding their required features in radiation shielding.
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