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System for measuring properties of electronic transformers
Němec, Ondřej ; Havránek, Zdeněk (referee) ; Klusáček, Stanislav (advisor)
The purpose of this thesis was to study the properties of electronic current and voltage transformers, choose the method for temperature cycle accuracy test and the development of the measuring software. Measuring software was realized in LabVIEW version 8.2. The first part describe the topic of this thesis. The second part describes various kinds of sensors and describtion of functions and specifications. The third part describe programming system LabVIEW. The fourth describe design of connection supply and measurement part of circuit. The fifth part describes used instruments. The sixth part is about used methods measuring. In the seven part is the description of the functions of this program and its control. In eight part is evaluated measurement uncertainty. In the last part are shown examples of the application program.
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Light wavelength measurement module
Matoušek, Vojtěch ; Štohl, Radek (referee) ; Havránek, Zdeněk (advisor)
Measurement of the wavelength of light source by means of dual-wavelenght photodiode sensor is easy and fast. From the dependencies of the measured voltages corresponding to generated photocurrents of both elements of dual-wavelength sensor it can be calculated the information about wavelenght and intensity of the measured light source. Evaluation, displaying on LCD and sendind of measured information to PC are ensured with microcontroller from the AVR family – ATMega32. One part of the project is also visualization software for PC. Measurement module can be powered with wall socket power adaptor or with battery.
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Frequency measurement
Milota, Martin ; Havránek, Zdeněk (referee) ; Čejka, Miloslav (advisor)
The theme of this thesis is presentation of the CompactRIO platform by National Instruments with its range of hardware and the possibility of using this platform for the frequency measurement of analog signals. The result of this thesis is software equipment for this device focusing on the frequency measurement of analog signals and experimental verification of posibilities of a specific configuration of this platform in the range of measurable frequencies.
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Impact hammer calibration
Šafář, Jakub ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The aim of this thesis is verification of sensitivity of an impact hammer ENDEVCO 2302-5. The tesis also discusses the possible negative influences of the experiment. Calibration of an impact hammer was performed using known mass.
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Data acquisition modules
Štreit, Zdeněk ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
This bachelor’s study focuses on design, realization and practical measurement of galvanic isolation temperature transmitter’s accuracy for the Pt 100 platinum resistance temperature detector. The beginning of the study describes the kinds of sensors for resistance temperature measurement, their division and charecteristics, whereby the stress is put on platinum resistance temperature detectors. The other part of this bachelor’s study depicts methods of connecting the platinum detector to a measuring circuit and evaluation of such a signal. It contains options of further processing of the measured signal using either various connections of operating amplifiers or specialised circuits. Issues with evaluation of the platinum detector’s signals as compensation of an input conductors‘ resistance and linearization of a platinum detector‘s course are solved. The following chapter introduces causes of galvanic isolation in a measurement chain and its principle. Electronic components and circuits that ensure the galvanic isolation are also discussed. The final part the this bachelor’s study is devoted to my practical proposal of a circuit solution for the platinum detector’s with galvanic isolation transmitter. It describes my proposed design of the transmitter’s input part, possibility of the Pt 100 detector’s linearization and galvanic isolation using a linear optocoupler. The transmitter was measured at several surrounding temperatures and the results were processed into tables and charts that are presented in an appendix to this study. This bachelor’s study goal was met as I have managed to produce the temperature transmitter according to the request. The worsened accuracy of the output voltage at temperatures lower or higher than +20°C can be eliminated by using resistors with lower temperature coefficient in a measurement bridge.
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Measurement of the centrifugal acceleration
Košta, Ondřej ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
This work is concerned with design and realization of rotational speed sensor based on measuring of the centrifugal acceleration. The measuring chain is designed as wireless, because it is needed to transfer the information about acceleration from rotating shaft, so connection by wire is impossible. The measuring chain is realized by using convenient MEMS accelerometer, that's why the first chapter is dedicated to short introduction of MEMS technology. Then the reader is introduced to methods and physical principles of acceleration measurement. The two most used types of accelerometers, piezorezistive and capacitive, are described deeper. The last theoretical chapter deals with two ways how to determine rotational speed from acceleration. The process of design of the measuring chain is described in the practical part of work. There are reasons for choosing a microcontroller. Sampling and message sending algorithms are described, there is also a description how AP receives messages. The AP serves as bridge between transmitting part and PC. Measured data are processed by PC in developing environment LabVIEW. Then the virtual instrument, which process measured data and represents them on screen for the user, is described. Finally the mechanical parts of the centrifugal acceleration measurement tool are described.
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Practical verification of EMAT transducer parameters
Zlámal, Michal ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The challenge is familiar with EMAT transducers, their basic characteristics and principles of operation. Inclusion of the theoretical knowledge acquired in Semester work 1 is based on the practical measurement of the frequency characteristics of transmitting and receiving part of laboratory made EMAT transducers. Based on the measured results should be followed by an improved design of sensor to achieve higher sensitivity with the appropriate shape of frequency response. For generating of exciting signal is expected to use LabVIEW programme environment. For credible results of the measurements in a broad range is needed to make broadband power amplifier for the transmitting and low-noise broadband amplifier for receiving part of EMAT transducer.
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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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