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Optical connections and their influence on transmission
Jaroš, Pavel ; Šporik, Jan (referee) ; Tejkal, Vladimír (advisor)
The aim of this bachelor‘s thesis is to evaluate the current options of connecting optical fibres and their application in specific situations. Firstly, I will deal with fiber optic system and its components in detail. Then, this topic will be futher developed by discussing fibre connection problems, fusion splicing for making permanent fiber join, mechanical splice and, most of all, optical connectors. In following chapters I introduce mathematical dependence of attenuation on the relative possition of the ends of fibers. Another aim of the work was to create an application in a suitable programming enviroment, which will be used for design of optical path.
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Optical fibres for ionising radiation measurements
Zbožínek, Tadeáš
The work focuses on studying methods of measuringionizing radiation using optical fibres. More attention is paidto their use, together with scintillation materials. The proposedmethod allows the connection of an electronic detector witha scintillation sensor by optical means. The interconnectionprovides the possibility of shielding the detector from the effectsof high ionizing radiation activities. The shielded detector will thusnot be subject to the adverse effects of this radiation and can beused even for long-term measurements of high activities. Firstexperimental measurements of reference sources verifythe principle of the proposed method.
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Evaluation of selected load tests of ductile piles instrumented with distributed fibre optic sensors
Genzer, Christian ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
Despite the fact that the use of driven ductile piles is not as widespread in the Czech Republic as in surrounding countries, this method provides a fast and reliable solution for foundation structures. To verify and optimise the design, in-situ load tests are often carried out on a realistic scale. As a standard, string or resistance strain gauges are used to measure the resulting deformations. Although their use is cheap and relatively simple, the measured results do not provide a complex view of the behaviour of the structure over its entire length and with sufficient accuracy. Therefore, in recent years, the application of fiber optic-based measurement systems has been increasing. The goal of this bachelor thesis was to evaluate several load tests of driven ductile piles fitted with fibre optic sensor systems, considering a number of factors that negatively affect the measurement results. Examples of these include pile bending, measuring oscillations due to the technology of execution and the method of measurement, or the development of tension cracks in the grouting. For each load test, the site geology and test pile parameters were specified first. Afterwards, the technology of the performed load test was described and the results of standard monitoring were presented. Based on the measuring from distributed fibre optic sensors, the relative strain and axial force curves were constructed, from which the ultimate skin friction values were determined. These values were correlated with the driving times in each pile section and based on this relation the K_SHAFT coefficients were set. At the end of the thesis is presented a summary of the collected data and their comparison between each other.
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Optical fibres for ionising radiation measurements
Zbožínek, Tadeáš ; Jelínek, Michal (referee) ; Mikel, Břetislav (advisor)
The work focuses on studying methods of measuring ionizing radiation using optical fibres. More attention is paid to their use, together with scintillation materials. The proposed method allows the connection of an electronic detector with a scintillation sensor by optical means. The interconnection provides the possibility of shielding the detector from the effects of high ionizing radiation activities. The shielded detector will thus not be subject to the adverse effects of this radiation and can be used even for long-term measurements of high activities. First experimental measurements of reference sources verify the principle of the proposed method and help to select the best choice for the type of optical fibre.
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Příprava optické dráhy pro experimenty z kvantové mechaniky
ŠTĚPÁNEK, Jan
The aim of this bachelor thesis is to build an optical path (for further experiments of quantum physics), which was demonstrated on non-linear experiment - spontaneous parametric down-conversion (SPDC). The main theoretical part summarizes the basic characteristics (types, usage, limits) of optical fibres and theory of SPDC experiment. In the experimental part is briefly described process of optical fibres construction, which were hand-made and polished in laboratory conditions. These optic fibres were used for SPDC experiment, which occurs when the light of high intensity passes through BBO crystal. It contains the results of exploring the efficiency of down-conversion process.
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Optical connections and their influence on transmission
Jaroš, Pavel ; Šporik, Jan (referee) ; Tejkal, Vladimír (advisor)
The aim of this bachelor‘s thesis is to evaluate the current options of connecting optical fibres and their application in specific situations. Firstly, I will deal with fiber optic system and its components in detail. Then, this topic will be futher developed by discussing fibre connection problems, fusion splicing for making permanent fiber join, mechanical splice and, most of all, optical connectors. In following chapters I introduce mathematical dependence of attenuation on the relative possition of the ends of fibers. Another aim of the work was to create an application in a suitable programming enviroment, which will be used for design of optical path.
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Tapered optical fibers
Martan, Tomáš ; Kaňka, Jiří ; Podrazký, Ondřej ; Kašík, Ivan ; Matějec, Vlastimil
A paper is focused on a design and manufacturing microstructure optical fibers with a high nonlinear coefficient, which was reached by using a nonlinear glass and tapering a microstructure optical fiber section. In designed highly nonlinear fiber taper, supercontinum generation was simulated. Designed tapered microstructure optical fiber was manufactured with using constructed tapering apparatus. The tapering apparatus was also employed for producing fiber tips, as probes for pH measurement.
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Autofluorescenční spektroskopie plicní tkáně
Votruba, J. ; Zavadil, Jiří ; Javorský, Stanislav ; Kostka, František ; Klimtová, E. ; Brůha, T.
In-vivo investigation of bronchial tissue by autofluorescence (AF) spectroscopy is reported. The study demonstrates differences of both the spectral shape and of signal intensity in photoluminescence spectra emitted from tissue affected by carcinoma as compared to healthy bronchial mucosa. It turns out that point measurements of AF spectra significantly increase the diagnostic utility of the AF method in discrimination of malignant and benign tissue as compared to commercial AF imaging systems.
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Optické senzory pro monitorování bioprocesů
Podrazký, Ondřej ; Matějec, Vlastimil ; Kuncová, Gabriela ; Pospíšilová, Marie ; Mrázek, Jan ; Kašík, Ivan ; Rose, K. ; Jaffrezic-Renault, N. ; Dzyadevych, S. ; Šašek, L. ; Scully, P. J.
The contribution presents results of the research of an optical glucose sensor. The detection of oxygen depletion caused by glucose oxidation under glucoseoxidase catalysis was used in the glucose sensors. Fluorescence quenching of ruthenium complexes by oxygen was used for the oxygen detection. The complexes and enzyme were immobilized in inorganic-organic ORMOCER membranes. Developed fiber-optic sensors enable to detect glucose in concentrations up to 3 mmol/L and with response times of about 20s.
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