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Angular velocity sensor with Sagnac interferometer
Skalský, Michal ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
This thesis deals with theoretical description of fiber-optic angular velocity sensors, or gyroscopes, and further with design and construction of own sensor of this type. The theoretical part describes problematics of interferometric and resonant fiber-optic gyroscopes. Basic principles and physical limits are described for both types. The main focus is then put on analysis of possible conceptions of these sensors. Solutions using different optical configurations as well as various modulation and signal processing schemes are discussed. The practical part deals with design and construction of own interferometric fiber-optic gyroscope in closed-loop configuration. The gyroscope utilizes all-fiber components including piezoelectric phase modulator and unexpensive single-mode fiber, which are commonly used only for open-loop configurations. To realize closed-loop operation, special modulation scheme based on fully harmonic signal was develeped, which yields linear output within wide dynamic range. This type of modulation requires high level of synchronization achieved by using a field-programmable gate array module. The gyroscope utilizes powerful broadband fiber source, polarizer and Lyot depolarizer which ensure good reciprocity of whole architecture. The parameters of the sensor, obtained by measurement, are even comparable to some sensors using PM fiber, which is much more expensive.
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Angular velocity measurement with fiber optic interferometer
Skalský, Michal ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This thesis deals with general theoretical description, design and construction of sensor of angular velocity based on Sagnac interferometer, or interferometric fiber-optic gyroscope. The theoretical part is focused firstly on explanation of basic principles and finding important formulas. Secondly, some state-of-the-art configurations of the fiber-optic gyroscope and their differences are analysed. Limiting factors and parasitic effects are also described. Attention is also paid to properties and suitability of particular optical components. The practical part especially deals with an utilization of common low-birefringent optical fiber in an fiber-optic gyroscope. Firstly, some basic properties of components and the simplest configurations of gyroscope were tested. They provided an important knowledge for design of final solution working in an open loop configuration with phase modulation. Further, specific components used in this demonstration sensor and its construction are described in more detail. Designed gyroscope utilizes all-fiber components made of common low-birefringent fiber so this solution is unexpensive. It uses an unpolarized light and depolarizer to ensure stability. Another specificity is a light source using spontaneous emission of erbium-doped fiber. Finally, some basic parameters of designed gyroscope acquired by measurement as well as record of calibration are stated.
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Angular velocity measurement with fiber optic interferometer
Skalský, Michal ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This thesis deals with general theoretical description, design and construction of sensor of angular velocity based on Sagnac interferometer, or interferometric fiber-optic gyroscope. The theoretical part is focused firstly on explanation of basic principles and finding important formulas. Secondly, some state-of-the-art configurations of the fiber-optic gyroscope and their differences are analysed. Limiting factors and parasitic effects are also described. Attention is also paid to properties and suitability of particular optical components. The practical part especially deals with an utilization of common low-birefringent optical fiber in an fiber-optic gyroscope. Firstly, some basic properties of components and the simplest configurations of gyroscope were tested. They provided an important knowledge for design of final solution working in an open loop configuration with phase modulation. Further, specific components used in this demonstration sensor and its construction are described in more detail. Designed gyroscope utilizes all-fiber components made of common low-birefringent fiber so this solution is unexpensive. It uses an unpolarized light and depolarizer to ensure stability. Another specificity is a light source using spontaneous emission of erbium-doped fiber. Finally, some basic parameters of designed gyroscope acquired by measurement as well as record of calibration are stated.
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Angular velocity sensor with Sagnac interferometer
Skalský, Michal ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
This thesis deals with theoretical description of fiber-optic angular velocity sensors, or gyroscopes, and further with design and construction of own sensor of this type. The theoretical part describes problematics of interferometric and resonant fiber-optic gyroscopes. Basic principles and physical limits are described for both types. The main focus is then put on analysis of possible conceptions of these sensors. Solutions using different optical configurations as well as various modulation and signal processing schemes are discussed. The practical part deals with design and construction of own interferometric fiber-optic gyroscope in closed-loop configuration. The gyroscope utilizes all-fiber components including piezoelectric phase modulator and unexpensive single-mode fiber, which are commonly used only for open-loop configurations. To realize closed-loop operation, special modulation scheme based on fully harmonic signal was develeped, which yields linear output within wide dynamic range. This type of modulation requires high level of synchronization achieved by using a field-programmable gate array module. The gyroscope utilizes powerful broadband fiber source, polarizer and Lyot depolarizer which ensure good reciprocity of whole architecture. The parameters of the sensor, obtained by measurement, are even comparable to some sensors using PM fiber, which is much more expensive.
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