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Angular velocity measurement with fiber optic interferometer
Sodomka, Pavel ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This bachelor thesis deals with the proposal and implementation of optic-fibre interferometer using the Sagnac phenomenon which measures the angular speed. In the theoretical part of this work, the possible interferometers are closer described and specified, base of wave interference, problems of the rotatory movement. The Sagnac phenomenon is explained and described here. Further the possible constructions of the optical-fibre interferometers for the measurement of the angular speed, including the described errors, which prevent the correct assembling and the implementation of the sensor. In the practical part of this work, the optical-fibre interferometer with the minimal balanced configuration. The individual optical and optical-fibre elements are selected and described to the given configuration, such as the source of radiation, polarizer, controller of polarization, divider, phase modulator, isolator, detector, optical fibre and optical-fibre coil. There is the specified and based problem which did not allow to successfully finish the assembled optical-fibre interferometer. In conclusion of this work there is the recommendation how to solve the caused problem.
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Measurement of the piezoelectric charge coefficient
Stehno, David ; Uher, Miroslav (referee) ; Fialka, Jiří (advisor)
The thesis aim was to study in theory the determination of piezoelectric coefficients, in particular piezoelectric coefficient of charge and to use different measurement methods to determine this factor. Also to further study the issue of determining the uncertainties and determine the measurement uncertainty. Measurements were conducted on cylinder-shaped samples, with different dimensions of individual samples. With type material PCM51 and PCM41. Piezoelectric coefficient measurements of charge was carried out using three methods: frequency, direct and quasi-static. The results achieved by all methods are compared at the end of this study and the measurements uncertainty are calculated and discussed for each method.
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Processing of digital signals from interferometer
Trličík, Jakub ; Čejka, Miloslav (referee) ; Havránek, Zdeněk (advisor)
Abstract This bachelor thesis deals with the S/PDIF digital signal processing from interferometer Polytec OFV-5000, by measurement application created in LabVIEW. This paper describes the theory of laser vibration measurement and encoding S/PDIF digital signal. Text also introduces a Polytec system for vibration measurement and system for data acquisition by National Instruments. The following is a description of the created measurement application, divided into three parts: decoding an S/PDIF, acquisition and display of digital data and acquisition and display of analog data to compare with digital output. In the last part of the thesis are presented the results of comparing analog and digital output, and an evaluation of the achieved results.
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Dynamic laser interferometer
Chovaneček, Libor ; Drexler, Petr (referee) ; Fiala, Pavel (advisor)
The theme of this bachelor´s project is dynamic laser interferometer. The project is firstly focused on theory, where it explains the term of interference and principle of operation of interferometer on specific types of interferometers. Different types of lasers used in interferometers are mentioned there. The next part of this paper is focused on assemblage of interferometer with description of particular parts. There are mentioned two methods of signal processing. The last part deals with confirmation of proper functioning of measuring system.
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The holographic interferometer of Mach - Zehnder type
JINDRA, Petr
The goal of my bachelor{\crq}s work is process of holografic interferometr Mach {--} Zehnder{\crq}s type and exact description all of its parts and its application in practice. Another goal of my work is evaluation of measured values in program DIPS and Matlab.
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