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Digital oscilloscope with USB interface
Vadinský, Václav ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
The work deals with design and implementation of hardware and software oscilloscope to a PC. A communication with PC is via USB interface from which is the oscilloscope powered. The oscilloscope is equipped with 2 measuring channels with vertical resolution 12 bits and maximum sampling frequency 80MHz. Any adjustment of parameters is performed using the PC. The work also deals with manner of recording, synchronization of measurements and sending the measured data to PC and its subsequent processing and evaluation.
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Condition monitoring of small ball bearings
Šváb, Štěpán ; Pikula, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The aim of this thesis was to build equipment for testing bearing condition analysis during its life. The theory of bearing parameter and diagnostics methodology for their analysis are discussed. Hardware used for device design and data collection. Finally, the course of measurement and software evaluating the end of the test are discussed.
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Michelson's interferometer
Rýc, Jan ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The diploma work deals with techniques of optical contactless distance and velocity measurement. A basic summary of the methods are involved. The problematic of interferometric methods for vibration measurements is analysed in detail. It contains division of interferometers, description of their function principles and also chapters dealing with elements used in interferometers such as lasers, photodetectors and elements in the ray optical way - polarizers, retarders, optical isolators. The vibration and length measurement methods are described, as well as the conception of homodyne and heterodyne detection. Part of this work focuses on the quadrature signal processing and on the proposal of algorithm for demodulation of velocity/displacement and undergoing simple motioning object deviation. This algorithm is implemented in Labview and the whole software instrument served also for visualisation of measured data of the interferometer model constructed in the laboratory. The way how to build up a model, its setting and two possible configurations suitable for homodyne detection are described. Model of interferometer is built-up on the optical breadboard. Particular components are fixed by the help of mounts. The model and software enable to measure the velocity and the vibration deviation with the light wavelength exactness. Functionality and the exactness of the laboratory model are verified by vibrometer. Effects on the measurement uncertainty are discussed here and ways how to restrain them are proposed.
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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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Effect of vibration on image quality of the electron microscope
Šafář, Pavel ; Horák, Karel (referee) ; Havránek, Zdeněk (advisor)
My thesis focuses on one the parasitic factors influencing an electron microscope during recording - i.e. the vibrations. Their impact on the quality of the shots is crucial and it is thus desirable to discover the origin of the vibrations and the way they are transmitted on the device and also to strive to eliminate this phenomen as much as possible. Measurements to estimate the source of vibration on the device as well as in its surrounding are a part of my work.
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Inclinometers and Gyroscopes
Hývnarová, Irena ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
This study deals with tilt sensors. Besides others methods, accelerometers and gyroscopes are also convenient to solve this problem. Tilt sensors which are described in this thesis are working with capacitive, piezoresistive and thermal method. Capacitive accelerometers from producer Analog Devices, STmicro and Freescale, piezoresistive accelerometers from producer Panasonic Matsushita and gyroscope ADXRS300 are tested by practical measurement. Parameters of these accelerometers are found and they are compared with parameters from producer. Measurement reliability in this study is analysed as well. This thesis is divided in chapters theoretically describing principles of particular accelerometers and the chapters containing measured data evaluation.
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Electronic module for acoustic detection
Maršál, Martin ; Klusáček, Jan (referee) ; Havránek, Zdeněk (advisor)
This diploma thesis deals with the design and implementation of an electronic module for acoustic detection. The module has the task of detecting a predetermined acoustic signals through them learned classification model. The module is used mainly for security purposes. To identify and classify the proposed model using machine learning techniques. Given the possibility of retraining for a different set of sounds, the module becomes a universal sound detector. With acoustic sound using the digital MEMS microphone, for which it is designed and implemented conversion filter. The resulting system is implemented into firmware microcontroller with real time operating system. The various functions of the system are realized with regard to the possible optimization (less powerful MCU or battery power). The module transmits the detection results of the master station via Ethernet network. In the case of multiple modules connected to the network to create a distributed system, which is designed for precise time synchronization using PTP protocol defined by the IEEE-1588 standard.
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Diagnostic module for Single-Wire CAN bus
Jež, Michal ; Doseděl, Martin (referee) ; Havránek, Zdeněk (advisor)
The basic properties of the CAN bus are analyzed in the bachelor's thesis. Furthermore, this work deals with the availability of circuits for the implementation of the CAN bus and the physical layer Single Wire CAN. Subsequently, the design of the diagnostic unit for the CAN bus is processed. It also deals with the design of firmware for the diagnostic module and a PC program for subsequent data analysis. Finally, the compatibility of the Single Wire CAN bus with the Low Speed CAN bus is tested.
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Measurement of very small displacements with fiber-optic interferometer
Vybíral, Dominik ; Šedivá, Soňa (referee) ; Havránek, Zdeněk (advisor)
This master's thesis is focused on optical methods of measurement of very small dynamic displacements. Principles of interfermeters with picometer resolution including Fabry-Pérot interferometer are discussed and an integration using this interferometer was designed. Parasitic influencers of Fabry-Pérot interferometer were described as well as signal processing methods for interferometer's output signal. An interferometric meter for measurement of dynamic displacement was designed with frequency range of several kHz. These parameters are achieved under condition of photonic crystal layer placed on measured sample.
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