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Automated measurement with monochromator in LabVIEW
Jakeš, Libor ; Vágner, Martin (referee) ; Havránek, Zdeněk (advisor)
This bachelor´s thesis is dealing with plan and realization of automated measuring with monochromator. The next goal of this thesis is familiarizing us with control programs, which I have created in LabVIEW. I am going to control the monochromator by means of measuring card NI myDAQ and at the same time acquisition data from the optical photodetector.
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Compact datalogger with flash memory
Vágner, Martin ; Hynčica, Ondřej (referee) ; Bradáč, Zdeněk (advisor)
This thesis deals with design of small datalogger with flash memory card. At first are discussed parameters, functions and features of dataloggers. The second part deals with a problem of digital measurement of analog signals. The rest of this thesis gives attention to main goal which is design of datalogger. It consists of circuit diagram, layout of printed circuit board, firmware for microcomputer and software for PC.
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Current sensor with digitized output signal
Hanuš, Ivan ; Vágner, Martin (referee) ; Havránek, Zdeněk (advisor)
The objective of this thesis is to describe principles of measuring of alternating current in low voltage power supply network with Rogowski coil and to study details of requirements for electronic current sensor with digital output. Furthermore to study the current solution of digitalization of output signal from Rogowski coil and to determine metrological characteristics of the digitalization module for processing the signal from the Rogowski coil as current sensor and to design a concept of an electronic current sensor unit with Rogowski coil and the digitalization module with the expected optical output. The theoretical part deals with the measurement of current using Rogowski coil, its characteristics and advantages compared to conventional current transformers. Further in the thesis there are specified the requirements for current sensor. The practical part deals with the design of digitalization module consisting of a pair of AD converters, a microcontroller and output circuits. Furthermore, the thesis deals with digital signal processing of signal from Rogowski coil. Furthermore, the thesis describes firmware for microcontroller and PC application. The result of thesis is functional circuit of electronic current sensor that processes signal from Rogowski coil and converts it to digital form.
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Automatic calibration of inercial sensors
Hamada, Vladimír ; Vágner, Martin (referee) ; Macho, Tomáš (advisor)
The main aim of this thesis is to design and build automatic calibration system for inertial measurement sensors. The calibration system is intended to support the development of devices with inertial measurement sensors. The great emphasis is placed on the configurability of system and for this reason all calculations are realized by Matlab system, which is well known by engineers. There is also presented design of inertial measurement unit, which is used as a~model sensor unit for calibration system development.
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Stroboscope tachometers
Hortai, František ; Vágner, Martin (referee) ; Beneš, Petr (advisor)
This bachelor’s thesis describes the design of a rotation measuring device using stroboscopic effect. In the first part of my work I have studied the solutions to the problems of rotation measuring, followed by description of the stroboscopic effect. Individual chapter presents a market research of the commercial strobe tachometers. The practical part proposes and designs an own stroboscope. The stroboscope allows manual adjustment, external synchronization, phase shifting. Electronics is controlled by a microcontroller from Atmel, the light source are power LEDs. It was designed a two-sided circuit board by using Eagle Professional 6.1.0. The circuit board was brought to function by planting the components on it. Development continued by creating the driving program for the microcontroller. The end result of my work is functional stroboscopic tachometer in a box together with the necessary electronic components serving for its proper functioning.
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User-defined Measurement Modules for cRIO
Pivnička, Martin ; Vágner, Martin (referee) ; Havránek, Zdeněk (advisor)
This thesis describes design and manufacture of measuring and communication modules for CompactRIO platform. In the first section is described platform from National Instrument suitable for measurement and control technology. There is written more fact about CompactRIO. The second part is focused on description of the hardware requirements needed to construct the module, communication and working modes. The third part describes information about support programs. At the end of third part is describes practical application of input digital card. Next section consists of practical proposal modules (input / output analog module, GPS modulu) and achievements.
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Analysis of dynamic parameters of laser vibrometers
Pavloň, Martin ; Vágner, Martin (referee) ; Havránek, Zdeněk (advisor)
This diploma thesis deals with the theoretical description of interference methods used to measure vibrations, examines main parasitic effects and analyses its contribution to achievable the resolution. In the practical part, it uses several measurements to verify the effects of the level of reflected beam, stand-off distance and speckle noise. It also proposes a practical experiment for measuring dynamic parameters and signal-noise ratio. Results show that, the noise is exponentially dependent on the level of the reflected beam. The visible maximum of the vibrometer proved to be critical in terms of time stability of the measured signal level in two of the three measurements. Results of the dynamic measurement show that, the measured deviations were not degraded or significantly disturbed by the noise signal. From the measurement of the speckle noise, it emerged that the lowest level of noise is achieved with smooth and highly reflective materials.
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An Extended Model of a MEMS Gyroscope: Design and Identification
Vágner, Martin ; Sopata,, Milan (referee) ; Tůma, Jiří (referee) ; Beneš, Petr (advisor)
The thesis is aimed on measurement and modeling of MEMS gyroscopes based on input-output characteristics. The first part briefs the state of the art. The second part is dedicated to measurement methodology. Critical points and sources of uncertainty are discussed and evaluated using measurements or simulations. The last part shows key characteristics of MEMS gyroscopes based on the survey of a group of different sensor types. The results have revealed significant influence of supply voltage that causes bias drift of the gyroscope and bias drift of the internal temperature sensor. The error can be comparable to temperature drift; however, this effect is not addressed in the literature. The second observed effect is temperature dependency of angle random walk. In the last part, a general model of a MEMS gyroscope is rewritten to reflect observed effects. Moreover, the structure is selected to be easily extendable and the coefficients are expressed to allow a comparison of nominal parameters of different sensors.
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Datalogger for UL aircraft
Marek, Michal ; Vágner, Martin (referee) ; Klusáček, Stanislav (advisor)
This thesis describes the design of flight data recorder for UL aircraft. The theoretical part describes the basic principles of measurement of the quantities in relation to the operation of the aircraft, such as altitude, air speed. A separate chapter deals with systems for determining of GPS position. Furthermore, there are examples of instruments measuring these quantities. The practical part is focused on the description of selected components and their connection to PIC24FJ64GA004 microcontroller. This is followed by a description of the control of USB drives with USB Controller Vinculum-II. The work is finished by the functional test of the device.
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Software for an automatic testing of valves
Mudroch, Andrej ; Havránek, Zdeněk (referee) ; Vágner, Martin (advisor)
In this paper the software design and implementation of automated control system for test device is discussed. The device will serve for tests of drinking water valves. As regards the control and software design, the important parts are identified and their functions are discussed in details. As part of software design, the basic system structure and it`s modules` functions are described using UML diagrams. Because of implementation reasons, ways of communication – such as M-BUS are described; as well as acquiring, processing and writing data to output. User interface created in LabVIEW is created as well. All mentioned application blocks were implemented. In addition, in this paper there is overview of testing methods for drinking water valves.
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