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Measurement of conifers needles surface by MR tomography
Hladík, Roman ; Kubásek, Radek (referee) ; Mikulka, Jan (advisor)
This bachelor thesis deals with the tomography based on magnetic resonance and evaluation of scanned images of conifers needles. At first, it is described the physical basis and methods of magnetic resonance scanning of objects. Another part is devoted to graphical preprocessing, which consist of noise suppression and image segmentation. After that there are described the design and algorithm for parameter estimation implemented to the application. The first experimental measurements were lightly discussed and evaluated in the last part of the work. In the last part there are discussed results of the experimental measurement. The attached documents contain the source code in Matlab language.
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Time-frequency analysis
Tráge, David ; Hadinec, Michal (referee) ; Kubásek, Radek (advisor)
The aim of this bachelor`s thesis is to explore possibilities of solving time-, frequency analysis a their combination time-frequency analysis by different methods for example Fourier transform a Wavelet transform. Going through this project we will get know each transformation and we will make clear procedure of their solving and first of all their advantages and disadvantages in view of accuracy of frequention`s mark in time.
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Methods of weighting the magnetic resonance signal
Filla, David ; Kubásek, Radek (referee) ; Hadinec, Michal (advisor)
The objective of this project is introduction to the fundamental principle of magnetic resonance and to the basic measuring methods used in MR. There is also described how to set parameters of pulse sequences in different measuring methods to obtain an image weighted by relaxation T1, relaxation T2, diffusion and eventually proton density. In the experimental part, we have measured images of three samples (tomato, pepper and mandarin) by four methods (SE, GE, IRSE and IRFSE). For obtained measured images we have proceed phase correction, created T2 and T2* maps. Then we consider the images obtained in terms of quality and compare with each other.
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Mapping and homogenity correction of basic magnetic field in tomograph
Žůrek, Dalibor ; Kubásek, Radek (referee) ; Hadinec, Michal (advisor)
This work focuses on a search of available literature in the field of mapping the magnetic field and the degradation of the field gradients. Initially on introduction to basic concepts in the field of magnetic resonance imaging, which are important for understanding the problems and become familiar with the principles of measurement of magnetic fields on the selected surface. Furthermore, there are described two basic measurement techniques, magnetic resonance imaging. The work is analyzed the degradation patterns of magnetic field gradients using the Taylor series and spherical functions. The second part describes how to obtain readings in the tomograph, which together with the previous decomposition of the field then used to describe a numerical calculation of magnetic induction on the surface of a sphere. Values measured and calculated values are compared at the end.
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Realization of noise generator
Kalánek, Jakub ; Hadinec, Michal (referee) ; Kubásek, Radek (advisor)
This work occupy practical realization noise generator. The first part is concentrated on description accidental signal. In the second are color and sorts noises. The third part is concentrated on usage noise in practices. In the fourth part are sorts sources noise. The fifeth part is concentrated on circuit design and design easy noise generator and test Zener diode and set work point.
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Logger pulse from wattmeter
Severa, Pavel ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
Most electronic wattmeter contains output for processing information on the con- sumption of other devices. The aim of this semestral project is to create a suitable device for reading output from power meter, store this information on the removable medium in size and ability to integrate into the distribution cabinet. Among other things, will monitor and record mode cheaper electricity, known as night mode.)
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Measurement of biological structures humidity
Vlk, Jáchym ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
The work summarizes known methods about measuring liquids and humidity in complicated biological structures. Particular methods and their principles are stated and described here. This work includes description and creation of inductive and capacitive sensor as well as information for creating inductive and capacitive sensor.
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Application for magnetic field mapping using F.W.BELL 9950
Kohnheiser, Jan ; Kubásek, Radek (referee) ; Hadinec, Michal (advisor)
The aim of this project is to acquaint the reader with the possibilities of controlling gaussmeter FW Bell 9950 by computer. The thesis analyzes the problems of measurement of magnetic flux density and the measuring instrument itself and its ability to communicate with the PC will be introduced. Next part of the thesis deals with the description and control of the application designed for communication and mapping magnetic field with F.W. Bell 9950.
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Sensor for sensing of the one-time fast events
Kočí, Radek ; Kubásek, Radek (referee) ; Klusáček, Stanislav (advisor)
In this thesis are analyzed and compared currently used methods for measuring the speed of moving objects. These are primarily optical and electromagnetic methods. In the practical part is made a design of a new electromagnetic sensor arrangement on the inductive principle using modeling in program FEMM, through the compilation and verification of practical functionality.
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Contactless Wiegand Effect DC and AC current sensor
Štefánek, Martin ; Szabó, Zoltán (referee) ; Kubásek, Radek (advisor)
The paper describes the types of magnetic sensors, which are used for measuring magnetic fields. The document is divided into chapters, which describe Wiegandův sensor and its implementation into the magnetic sensor in this document is designed magnetic circuit design for this sensor. The work evaluates the progress in the design of contactless ammeter that measures AC and DC current via Wiegand effect. Experimental verification principle and its function for DC current is described in the penultimate chapter.
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