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Evaluation of standard uncertainty of Climatic Chamber
Dojava, Václav ; Havránek, Zdeněk (referee) ; Šedivá, Soňa (advisor)
The thesis deals with the problematics of confirmation of the climatic chamber CTS 65/50, which is a component of CVVOZE testing laboratory. Theoretical part deals with the analysis and description of methods of confirmation of climatic chambers based primarily on technical standards. This part then contains a brief description of a theory of measurement uncertainty. Practical part deals with the design of measurement procedure, which was used for confirmation measurement of ten temperature setpoints. This section then also contains an analysis of the measured data with the evaluation of standard combined uncertainty of temperature measurement. The last part contains an evaluation of the confirmation results, which were the basis for the determination of whether the climatic chamber meets the requirements for the steady-state temperature stability inside the workspace resulting from the standards for the climatic testing
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Strain Gage amplifier
Kneblík, Adam ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The thesis deals about method of gain signals from strain gauge bridges. There are mentioned some signal conditioning methods for bridges amplifiers and charactered their properties. In the next part of this thesis are calculated the amplifier errors for various temperature. There are projected individual variants of strain gage amplifiers (instrumentation amplifier AD524, isolation amplifier, switched capacitor based instrumentation amplifier), their properties are compared with strain gage amplifier Vishay P-3500.
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Simultaneous bidirectional transfer of data and power supply over one fiber
Baura, Tomáš ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This Bachelor’s Thesis deals with projecting and implementation of transmission systems using a single optical fibre for parallel bidirectional transmission of optical power and data signal. These systems include Polarization Division Multiplexing (PMD), Wave Division Multiplexing (WDM) and Time Division Multiplexing (TDM). The theoretical part of the thesis closely describes and specifies optical fibre, optical radiation sources and detectors as well as passive optical components suitable for transmission system implementation. Further, the thesis describes principles of individual transmission systems including a selection of particular optical and optoelectronic parts for the TDM and WDM transmission composition. Each chapter of the practical part of this document describes methods and processes used for individual measurements. First the individual parameters of individual optoelectronic and optical components of transmission systems are verified and characterized. This is followed by measuring the parameters of the composed TDM and WDM transmission systems such as optical loss, transmitted electric power efficiency, transfer speed etc. Finally, the possibility of outer optical signal detection on an integrated photodiode PIN of the laser diode is tested and verified, which could be used for both transmission and reception of data signal.
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Current sensor with digitized output signal
Poruban, Milan ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The main aim of this thesis is to describe principles of measuring of alternating current in low voltage power supply networks with Rogowski coil and study in detail the requirements for electronic current transformer with digital output. Farther confirm the basic parameters of Rogowski coil as an current sensor and creating its alternate electric model. Theoretical part deals issue of measuring alternating current with Rogowski coil, its properties, characteristics, construction and advantages over conventional current transformers of alternating current. There are also listed requirements for alternating current transformers and requirements for their digital output. A/D converters are also discussed. Practical part deals with measuring of parameters of Rogowski coil and creating its alternate electric model. Furthermore, the design and implementation of the input circuit for a pair of A/D converters, which represents a measurement card from NI. Data from the measuring card is processed by the program LabVIEW. The outcome of this thesis is a functional circuit that provides an analog signal pre-processing of Rogowski coils represented by installed PCB designed for 18-bit AD7690 converter and technology demonstrator, which processes the digitized signal from the measuring card.
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Motion activated measurement module with wireless interface
Novotný, Josef ; Krajsa, Ondřej (referee) ; Havránek, Zdeněk (advisor)
This semestral project deals with the selection of a suitable MEMS mechanical motion sensor with verylow power consumption. The market research is mainly about sensors that can be activated by motion. Project also contains description of motion activation function of the sensor ADXL362. Project also contains verification of datasheet data of the sensor ADXL362 for the motion activation. Further It also includes a market survey of microcontrollers with ARM Cotex M4 core. Furthermore, the wireless transmission via Bluetooth is tested and a measurement unit is designed and implemented. At the end of the thesis are achived results summarized.
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Programmable resistance decade
Rusnák, František ; Havránek, Zdeněk (referee) ; Kunz, Jan (advisor)
Goal of this work is design of programmable resistance decade controlled by microprocessor from the family STM32. The resistance decade will be used for testing energy harvesters. The theoretical parts deals with market research of commonly available resistor decades. The first designs of resistance decade were created. The principles of working can be multiple. The standard principle of working resistance decade is based on resistor rows switched by relays. The work also deals with solutions where is complex resistor rows replaced by electronics active components. In the practical part of this thesis, active design was designed builded and measured for all its range. Resistor decade can generate resistance from 100 Ohms to 10 mega-Ohms. Protocol SCPI allows to use this device in automated measurement.
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Measuring system for acoustic characterisation of materials
Plánka, Mikuláš ; Havránek, Zdeněk (referee) ; Klusáček, Stanislav (advisor)
The diploma thesis deals with the measurement of acoustic parameters of the material using the B\&K 4206 impedance tube, specifically the absorption and reflection coefficients. The theoretical part provides a basic overview of the measurement methodology and a description of measurement quantities related to acoustic materials characterization. The measurement procedure using the PULSE LabShop software is also described in this work. The main focus of this thesis is the design and implementation of a custom open measurement system created in LabVIEW used to determine the aforementioned materials parameters. The results of the measurements using the custom implementation and the PULSE LabShop software are compared and evaluated in this diploma thesis.
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Measurement system with preamplifier for calibration of vibration sensors
Kaštovský, Jan ; Doseděl, Martin (referee) ; Havránek, Zdeněk (advisor)
This thesis deals with the design and implementation of a preamplifier for vibration sensors with IEPE interface and also for vibration sensors with charge output. The thesis also deals with a modification of a computer application for a measuring system in LabVIEW. The thesis builds on the already implemented measuring system for secondary calibration of vibration sensors. The results of the secondary calibration of this system with the added preamplifier are compared with the results of a primary calibration.
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Analysis of liquid electrolyte electrical parameters using impedance spectroscopy
Brabenec, Josef ; Pikula, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The bachelor thesis deals with impedance spectroscopy of electrochemical systems, especially liquid electrolytes. The method of impedance spectroscopy is widely used to describe electrochemical cells, batteries and electrolytes for diagnostic purposes over a wide range of frequencies. This thesis presents the main types of impedance imaging in the complex and frequency domain, as well as basic information on the measurement methods used and the methods for impedance analysis. The main part of the thesis was the development of software for automated impedance measurements and estimation of equivalent circuit parameters using basic and specialized circuit elements. A workplace with fabricated electrodes for liquid electrolyte measurements was prepared for the application. The functionality of the application was verified by real measurements of different concentrations of water and salt solutions. The validity of the estimated equivalent circuit parameters was verified on measured simple circuits connected from basic circuit elements and was also verified using the commercially used ZView software.
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Angle of arrival calculation methods for localization using UWB technology
Žaludek, Ivo ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The thesis describes UWB technology, compares available hardware platforms and describes UWB localization methods. The practical part compares the methods of calculating the angle of arrival from the phase difference of signal arrival on the two-element antenna array. The calculation is performed using the analytically obtained arc sine function and also using the look-up table and the polynomial function. The content of the look-up table and the coefficients of the polynomial function are based on the measured characteristics of the UWB receiver (anchor). The best result was obtained using the look-up table. More accurate results were obtained when the phase difference of arrival values were averaged.
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