Wyniki wyszukiwania - BazTech

1

Flex Fatigue Behavior Of Plastic Optical Fibers With Low Bending Cycles

Huang J., Křemenáková D., Militký J.

Autex Research Journal

|

2015

|

Vol. 15, no. 2

112--115

EN

Flex fatigue behaviour of plastic optical fibres (POFs) with the diameters of 0.2 and 0.3 mm under different pretensions is measured with fatigue life curve by flexometer. The fatigue sensitivity coefficient is calculated by the linear fitting curve of normalised stress versus logarithm of bending cycles. The residual modulus is investigated during the flex fatigue processes. The results exhibit the exponential relationship between applied pretension and numbers of bending cycles at break. It is indicated that the flex fatigue of POFs might be sensitive with high swing angle or swing speed. There is an evident loss of modulus for two POFs with pretensions of 4 and 10% of ultimate tensile strength during 10-times bending cycles. The values of residual modulus of two POFs almost keep constant after 10-times bending cycles.

2

Evaluation of Illumination Intensity of Plastic Optical Fibres with TiO2 Particles by Laser Treatment

Huang J., Křemenáková D., Militký J., Zhu G., Wang Y.

Autex Research Journal

|

2015

|

Vol. 15, no. 1

13--18

EN

CO2 laser treatment can increase the surface roughness of plastic optical fibres (POFs) with the diameter of 0.5 mm and enhance the input intensity and attenuation coefficient accordingly, which is supposed to weaken the side emission of POFs in long distance above 375 mm. TiO2 particles were applied to improve the increasing optical loss of POFs by laser treatment. POFs were first modified with fine TiO2 particles and then treated by CO2 laser with the pixel time from 30 to 120 ìs. The surface morphology was observed by scanning electron microscopy to investigate the changes of micro-structure before and after laser treatment and the distribution of TiO2 particles. The illumination intensity and attenuation coefficient were calculated and compared in two methods. It is visible that the evaluation by model LLF2 with two parts is more suitable for the fitting of experimental data and shows higher input intensity and lower attenuation than that by standard power function. Both the evaluation methods exhibit that the utilization of TiO2 particles could play an active role in the enhancement of side emission of POFs treated by CO2 laser.

3

Technologia światłowodów dla potrzeb metrologii

Wójcik J.

Pomiary, Automatyka, Komputery w Gospodarce i Ochronie Środowiska

|

2008

|

nr 1

3-7

PL

Zostały przedstawione aspekty materiałowe technologii światłowodów produkowanych na dużą skalę z dwóch najważniejszych tworzyw konstrukcyjnych włókien optycznych w kontekście tłumienności jako ich najważniejszego parametru użytkowego. Wyjaśniono w ten sposób, dlaczego są produkowane określone rodzaje światłowodów a inne znamy tylko z publikacji lub ich produkcja jest jednostkowa i cena wysoka. Metrologia musi bazować na światłowodach dostępnych na rynku kształtowanym przez produkcję na rzecz telekomunikacji. Jednak w niektórych przypadkach właśnie zastosowania w metrologii determinują produkcje określonych rodzajów włókien optycznych.

EN

The paper presents material aspects of technology of optical fibers fabricated from two the most significant materials in the context of their attenuation as the most important parameter. In this way it was explained why some kinds of fibers are fabricated, but another are known from scientific papers only, or their price is very high. Metrology should be and have to be based on the commercially available fibers on the market which is determined by mass production for telecommunication purposes. But in some cases just applications in metrology imply production of some special optical fibers.