National Repository of Grey Literature 101 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Multi-channel polarization optical fiber sensors in wave multiplex technique
Švehlík, Martin ; Grenar, David (referee) ; Filka, Miloslav (advisor)
The diploma thesis deals with the optical fiber sensor system assembly and its possibilities using 100 GHz wavelength multiplexing (DWDM), when using standard single-mode communication fibers. In the introduction, the necessary theoretical knowledge is discussed. The aim of the work is to design a temperature field violation sensor with remote excitation and detection. The practical part of the thesis contains the design and assembly of the measuring workplace. Also, the results of each measurement are presented, and at the end, they are compared and assessed.
Optical fiber polarization sensor optimalization for detection of fast and small temperature changes in military objects
Sergeev, Roman ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This bachelor thesis deals with the design of an optical fiber thermal (temperature) sensor suitable for application in a military building. The thermal sensor detects even slight temperature changes based on the change in the polarization state of the light. The thesis describes the basic theory, which serves as a source for understanding the principle of operation of the fiber optic sensor. In the practical part, the basic quantities describing the polarization state of light were measured. The measured values were plotted in graphs to illustrate the dependence. This thesis aims to measure the designed variants of the sensor connection and select the most suitable for temperature measurement.
Tolerance zone measurement on polarization multiplex
Soktueva, Galsana ; Grenar, David (referee) ; Filka, Miloslav (advisor)
The thesis deals with the measurement of tolerance zone of a polarization multiplex. The theoretical part deals with polarization of light, mathematical description using Stokes and Jones vectors and the representation of the instantaneous state of polarized light using a Poincaré sphere. It also deals with optical transmission and multiplexing. The final part of the thesis describes the design of the measuring workplace and its implementation.
Design of optical fiber temperature sensor for detection of defense perimeter
Zámečník, Ondřej ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with the issue of measuring the ambient temperature using a~single-mode optical fiber used as a temperature sensor. The thesis describes the basic knowledge about polarized light, its propagation in optical fiber and describes special fibers that preserve polarization. It also deals with the representation of polarization states on a Poincaré sphere and the use of Stokes and Jones vectors. In the practical part, several selected methods of optical signal supply to the temperature sensor are measured. Subsequently, the suitability of the given methods is evaluated from the measured results and the courses are compared with the records measured from real routes. This thesis aims to select a suitable connection of a temperature sensor for a long route of optical fiber and verify its functionality.
Measurement of polarized light properties on the dense wavelength division multiplexing in optical-fiber sensor systems
Bučko, Kristián ; Grenar, David (referee) ; Filka, Miloslav (advisor)
The polarization of light is one of the most remarkable phenomena in nature and has led to many discoveries in the optical-telecommunications sphere. The master's thesis describes the basic knowledge about polarized light, which includes the types of light polarization, the issue of Poincaré sphere, polarizing ellipse, etc. Emphasis is also placed on the measurement of optical power, where the analysis of various types of photodetectors and also polarimeters was performed. In the practical part of this work, the design of the workplace itself is described in the diagrams. Also, all devices in the workplace are analyzed and subsequently demonstrated measurement in several scenarios. The final chapter is a discussion with the measured results and graphical dependencies, comparison and analysis of results.
Long optical fibre routes influence on the polarizing state of light and uses it for powering polarization sensors
Panascí, Marco ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with the influence of long fiber optic paths on the polarization state of light and their use for powering polarization sensors. The aim of the diploma thesis was to design the arrangement of optical fiber components so that the polarization properties of light at the end of the path are further usable for sensory purposes. Four partial measurements with a long path (in a laboratory setting, laying in the ground, on a curtain, under the influence of external influence) and one measurement without a path under the influence of external influence were designed. The overall measurement results demonstrate that for the functional power supply of long-distance sensor systems, an existing single-mode fiber can be used (laid by laying in the ground), into which a light source for a given sensor system would be multiplexed. In the discussion, all types of measurements are analyzed and compared with each other. Finally, the overall result is summarized and applications are described in which such a sensor system could be used.
Measurement of polarized light properties on the opticla fiber sensor output
Velič, Ladislav ; Grenar, David (referee) ; Filka, Miloslav (advisor)
birefringance, degreeofpolarization, polarization, Stokesvectors, Poincarésphere, state of polarization, optical power, sensoric fibre, polarization-maintaining fiber, polaroid, poalrimeter
Birefringence Influence on Polarization Changes and Frequency on Optical Fiber Sensors
Panascí, Marco ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This bachelor thesis deals with birefringence influence on polarization changes and frequency on optical fiber sensors. The objective of the thesis is to design and implement a set of measurements that analyze these effects. The theoretical part deals with analyzing the polarization-maintaning fiber, the polarization of the light, and the sensory optical fibers, with some research. The practical part deals with design of the workplace, control measurement and sensor response at different temperatures. After the practical part there is a discussion over the measured values. It was found that this sensory optical fiber responds to a change in the ambient temperature of the optical fiber. The main result is that the wavelength varies with temperature.
Tolerance zone and birefrigence influnce measurement on polarization multiplex
Štohl, Jakub ; Grenar, David (referee) ; Filka, Miloslav (advisor)
The thesis deals with the measurement of tolerance zone and the influence of birefringence on the activity of polarization multiplex. The theoretical part deals with polarization of light, mathematical description using Stokes and Jones vectors and its representation by Poincaré sphere. It also deals with optical transmission and channel merging. The final part describes the designed measuring workplace and the measurement itself.
Measurement of polarized lightparametrs measurement on the optical-fiber sensor output
Drábek, Jakub ; Čučka, Milan (referee) ; Filka, Miloslav (advisor)
This master's thesis deals with the analysis of the optical power measurement using an optical fiber sensor. The thesis contains the theoretical background to understand the origin of polarization and its representation in space using Poincaré’s sphere and Stokes vectors. There is also a part describing optical performance measurement and the preview of analog measurements from various researches. Practical part focuses on verification of changes of fiber sensor parameters at temperature change in its surroundings and this part includes also additional suggestions for various types of measurements and verification of the function of the photodiode as an optical power transducer. Most measurements are based on the comparison of results obtained with the polarimeter. The results were plotted and discussed.

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