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Longitudinal structures in optical fibres with the use in sensorics
Falešník, Vlastimil ; Čučka, Milan (referee) ; Urban, František (advisor)
This semestral work describes key concepts, principles and basic characteristics of optical fibers. Furthermore, the principles of phase mask and subsequent records of perpendicular or tilted structures in fiber are being discussed. The work also introduces the use of such structures in sensorics as well as its connection to Bragg grating. Considerable part of this thesis is dedicated to analysis and production of longitudinal structures in fibers.
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Critical infrastructure protection using distributed temperature sensing
Holcman, Jiří ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This master thesis aims to show the possibility of practical use of an optical fiber as a distributed temperature sensor. The main goal is the possibility of protection of waste pipes (critical infrastructure) against leaks, fluid leaks, line disturbances, fires, freezing, etc. The first part describes the basic elements of the system for distributed temperature measurement using optical fiber such as optical fiber sensor, block diagram involvement and theoretical basis on which the measurement is based. The physical principle of temperature sensing using an optical fiber using Raman backscattering of light is explained, as well as Rayleigh and Brillouin scatterings, which, however, are not used in this thesis. Furthermore, the main advantages of DTS systems are presented, such as the possibility of detection over long distances, almost maintenance-free operation with a long service life and easy installation in practice. Next, some global DTS manufactures of equipment for the implementation of these distributed temperature measurement systems. To verify the main parameters, a reference measurement was designed and implemented. In the next part of the work is assembled a simple DTS system simulating the practical implementation of pipelines in laboratory conditions. The possibilities of measured quantities such as sensitivity to temperature changes, resolution and measurement accuracy were verified on this system. All these values were recorded, graphically represented and evaluated. The investigated quantities were clearly marked and described on the graphs of the results. At the end of the work, the results of measurements were clearly summarized and the possibilities of practical use for the protection of critical infrastructures were indicated.
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Distributed temperature sensor
Holík, Tomáš ; Čučka, Milan (referee) ; Münster, Petr (advisor)
Distributed temperature sensors are currently widely used. They are used for measuring temperature using optical fiber. DTS systems measure the temperature along the optical fiber. Optical fiber is used as a direct source of information, not as a carrier. That is, optical fiber is used as a sensor measuring the temperature. This work includes designs of the measuring system DTS using Raman scattering and Mach-Zehnder modulator in a single-mode fiber.
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Optical fiber point sensors
Okoun, Petr ; Čučka, Milan (referee) ; Urban, František (advisor)
This diploma thesis analyzes a structure of spot optical sensors with longitudinal grid and multiple Bragg grating and possibilities of spot optical sensors use and implementation in the industry. Basic principles of light propagation through optical environment are described in the introduction part, followed by description of phenomena in optical fibers and sensors. The distribution of fiber optic sensors and the use of optic fiber in spot mode is described further. The optical sensor system is designed on the basis of analysis with description of its construction at the end of this work. A significant part is devoted to the analysis of longitudinal structures in the fiber in response to multiple Bragg gratings, their subsequent manufacture and suggestion of use in sensors industry.
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Applications of optical fibre sensors
Ráboňová, Jana ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This master's thesis deals with the measurement of soil temperature. In the theoretical part, optical fiber systems were explained, with a focus on DSTS systems and their use. In the practical part, a functional system was created to measure the soil temperature at depths of 0.1-1~m using the Arduino platform. Furthermore, the temperature measurement was demonstrated on the test polygon using the optical fiber of the FTB 2505 instrument in laboratories.
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Distributed optical fiber sensors
Hynek, Jiří ; Šifta, Radim (referee) ; Münster, Petr (advisor)
Nowdays, optical fibers are one of important parts of computer networks, especially for their ability to transfer information for long distance. This thesis doesn´t utilize optical fibers as carriers, but as sources of information, specifically as sensors intended to detect physical effects acting on the optical fiber, which is usually used for telecommunication purposes. Linear and nonlinear properties of the fiber are used to gain information about acting effects on the optical fiber.
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Fiber optic perimeter intrusion detection systems
Duisenbekova, Karina ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
Tato bakalářská práce se zaměřuje na aplikaci optických vlaknových senzorů v perimetrickém zabezpečení s cílem zabránit neoprávněnému přístupu a intruzi. Tyto systémy dokážou rozlišovat různé typy vloupání a narušení, čímž zvyšují bezpečnost chráněných objektů. Teoretická část práce popisuje dva prototypy senzorů - distribuované akustické a interferometrické senzory. Praktická část se opírá o Mach-Zender interferometrický optický vlaknový senzor, jehož citlivost je testována skákáním a chůzí poblíž senzorových kabelů.
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Applications of optical fibre sensors
Ráboňová, Jana ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This master's thesis deals with the measurement of soil temperature. In the theoretical part, optical fiber systems were explained, with a focus on DSTS systems and their use. In the practical part, a functional system was created to measure the soil temperature at depths of 0.1-1~m using the Arduino platform. Furthermore, the temperature measurement was demonstrated on the test polygon using the optical fiber of the FTB 2505 instrument in laboratories.
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Critical infrastructure protection using distributed temperature sensing
Holcman, Jiří ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This master thesis aims to show the possibility of practical use of an optical fiber as a distributed temperature sensor. The main goal is the possibility of protection of waste pipes (critical infrastructure) against leaks, fluid leaks, line disturbances, fires, freezing, etc. The first part describes the basic elements of the system for distributed temperature measurement using optical fiber such as optical fiber sensor, block diagram involvement and theoretical basis on which the measurement is based. The physical principle of temperature sensing using an optical fiber using Raman backscattering of light is explained, as well as Rayleigh and Brillouin scatterings, which, however, are not used in this thesis. Furthermore, the main advantages of DTS systems are presented, such as the possibility of detection over long distances, almost maintenance-free operation with a long service life and easy installation in practice. Next, some global DTS manufactures of equipment for the implementation of these distributed temperature measurement systems. To verify the main parameters, a reference measurement was designed and implemented. In the next part of the work is assembled a simple DTS system simulating the practical implementation of pipelines in laboratory conditions. The possibilities of measured quantities such as sensitivity to temperature changes, resolution and measurement accuracy were verified on this system. All these values were recorded, graphically represented and evaluated. The investigated quantities were clearly marked and described on the graphs of the results. At the end of the work, the results of measurements were clearly summarized and the possibilities of practical use for the protection of critical infrastructures were indicated.
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