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Interferometric Measurement Of Optical Signal In Turbulence
Kovaľová, Soňa
This project deals with the measuring of the impact of atmospheric turbulence on laser beam used in wireless optical communication. The method is based on interferometry with using of Michelson interferometer. Mathematical apparatus comes from Kolmogorov’s cascade theory and statistical analysis.
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SMV-2019-63: Calibration system of PAZ measuring system
Mikel, Břetislav
Calibration measuring system is designed for calibration of PAZ measuring system. It allows to measure distances up to 3500 mm with an error of + - 5 µm. It uses incremental laser interferometry method. The system consists of several basic components - supporting traveling benches, motorized sliding measuring platforms, static platforms, He-Ne laser, control electronics and control PC. The whole system is equipped with three temperature sensors along the measured path, one humidity sensor and one pressure sensor, which are used to compensate the measured distance by laser interferometers.
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Interferometric measurement of optical signal in turbulence
Kovaľová, Soňa ; Křivák,, Petr (referee) ; Hudcová, Lucie (advisor)
The aim of this thesis is to quantify the impact of atmospheric turbulence on optical signal used in free space optic communication systems. The first part is associated with atmosphere as transmission medium. Following part deals with interferometry and components of interferometers. Various methods of analysis of trasmission environment for optical beam are introduced theoretically and experimentally. Mathematical apparatus based on Kolmogorov’s cascade theory, Rytov’s variance was used to find value of structural parameter of refraction as a main measure of turbulence intensity. Experimentally obtained data were subjected to statistical analysis. The visualization of interference pattern fluctuations under turbulent conditions is shown in the last section. Interferometric method was realized with Michelson interferometer.
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Sensor based on a fiber optic interferometer
Rozsypal, Filip ; Dejdar, Petr (referee) ; Čučka, Milan (advisor)
This diploma thesis deals with comparsion of 2x2 and 3x3 couplers. There is also description of issue of the Michelson interferometer and its use as a sensor. This sensor is very good at detecting vibrations. Part of the work is description of simulation of Michelson interferometer with 3x3 coupler as vibration sensor and localization of vibration on optical fiber by Michelson and Mach-Zehnder interferometer.
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Calibration of the FBG Measuring System by Laser Interferometer
Jelínek, Michal
This work deals with calibration method of the FBG based sensors and the nuclear power plant containment shape monitoring system. The design and the implementation of this system with the optical filter thermal compensation is described. The measurement of length changes is compared with the Michelson interferometer. The control system was programmed in LabVIEW.
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Fiber Optic Michelson Interferometer
Dorazin, David
The aim of this paper is to theoretically desribe function of the Optic fiber Michelson interferometer and its parts with description of the most important issues which can occure due to bad design. Second part of this paper is dedicated to simulation of the optic fiber Michelson interefometer in professional simulation software VPIphotonics.
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Processing of signals from fiber optic sensors
Sikora, Vojtěch ; Urban, František (referee) ; Čučka, Milan (advisor)
First two chapters of this paper deals with the division of optical fiber sensors, digital signal processing and includes price comparison of four experimental sensors. In chapter three analysis, description and evaluation of measurment has been demonstrated on Mach - Zehnder interferometer. Last chapter is about application for signal analysis from vibration sensors. Description contains snippets from source code and graphical user interface. This paper includes three fields - fiber optics, digital signal processing and creation of application - and thanks to them it provides solid basis for study of optic fiber sensors.
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Interferometric measurement of phase changes of optical beam in turbulence
Děcká, Klára ; Křivák,, Petr (referee) ; Hudcová, Lucie (advisor)
This master’s thesis deals with the impact of atmospheric turbulence on phase changes of a free space optical signal. This problematic is investigated by the interferometric method. A part of the thesis is focused on the phenomenon of atmospheric turbulence. Then the physical effect of interference is discussed and optical interferometers are described. The experimental part of the thesis is focused on measurement of phase shift of optical signal by interferometric method. The result of the thesis is to determine how phase shift of an optical beam depends on the strength of turbulence.
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Simulation of Mach Zehnder interferometer
Rozsypal, Filip ; Münster, Petr (referee) ; Čučka, Milan (advisor)
This bachelor thesis deals with the simulations of Mach-Zehnder and Michelson interferometer. These simulations are realized by VPIphotoncs and MatLab. The thesis also describes the optical and physical phenomena, the usage and the principle of operation of interferometers and results of measurements with validation of the basic work of both interferometers.
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Mechanical design of measurement system for reactive ion etching system
Maňka, Tadeáš ; Antoš, Martin (referee) ; Šerý, Mojmír (advisor)
The aim of this work is to design fully working measuring system for the reactive ion etching system (RIE). The Michelson interfometer, previously developed in Ústav přístrojové techniky, v.v.i., is used in this work. The theoretical part is aimed at description of interferometric methods for precise measuring of length. In next part the etching proces with RIE is described. In practical part the testing system was constructed from the parts of Thorlabs company . The functionality was controlled with this system and the results of measuring were compared with the profilometer. In next step technical drawings were created and the whole system was made.
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