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Pulse Oxymeter in LabVIEW
Synek, Josef ; Chmelař, Milan (referee) ; Čmiel, Vratislav (advisor)
One of the most important vital functions of the human body is providing sufficient oxygen to all its parts. Oxygen in the blood binds to hemoglobin and it is transported to tissues. Oxymetry is non-invasive method for measuring the amount of oxygen bound to hemoglobin. Oxygenated hemoglobin and deoxygenated have different absorption characteristics for light of different wavelengths. Therefore, pulse oxymetry transmits tissue with red and infrared light. Signal passing through the tissue is affected by the absorption properties of hemoglobin and heart pulse. These signals are measured and the ratio of their size allows us to calculate blood oxygen saturation.
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Fundamental properties of semicomductor materilas
Kahánek, Tomáš ; Jirák, Josef (referee) ; Špinka, Jiří (advisor)
This work deals with fundamental properties of semiconductors materials and methods of their measuring. This work is focused on non-contact methods using light to generate electric charge in semiconductor. Tests were focused on measuring characteristics of PN transition light diods and semiconductor specimen with big resistivity, there was founded absorption edge of silicon.
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Simulation of solar cells using in electrocars
Obadal, Petr ; Křivík, Petr (referee) ; Vaněk, Jiří (advisor)
The thesis deals with the question of the production of electric energy in electromobiles by the means of photovoltaic cells and its using. The thesis presents the model of photovoltaic system composed of the three photovoltaic fields incorporated in the electromobile model and it considers its maximum usable surface and efficiency. The thesis also includes the calculations concerning the charging time of accumulator, the amount of energy gained from photovoltaic fields – comparison of practical energy gain, the electric parameters in general and the overall performance of electromobile model. The aim of the thesis was to design an electromobile model which would serve as a model for actual-sized electromobiles using the renewable source of electric energy.
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Contactless Device for Multispectral Hand Scanning
Hlavačka, Marek ; Kanich, Ondřej (referee) ; Sakin, Martin (advisor)
This bachelor thesis concerned to design and implementation of a contactless device for multispectral hand scanning. The first part was focused on the necessary knowledge of biometrics, properties of human skin and electromagnetic radiation. When designing the work, emphasis was placed on user comfort and quality of processing. A modifiable solution sensing both visible light and near infrared radiation has been developed. As part of the work, a database of hands of 21 different people was created with a size of 400 images.
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Nanoelectrodes for biophysical measurements
Márik, Marian ; Hrdý, Radim (referee) ; Hubálek, Jaromír (advisor)
The aim of the project is formation of nanoelectrodes on the silicon wafer surface by thin-film techniques combined with lithography and nanotechniques developed in LabSensNano. Project is engaged in lithography and in preparation of silicon wafers. Furthermore is proposed a brief proposal of electrodes, proposal of realization and current state of the experiment.
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Biometric Liveness Detection for the Fingerprint Recognition Technology
Brabec, Lukáš ; Váňa, Jan (referee) ; Drahanský, Martin (advisor)
This work focuses on liveness detection for the fingerprint recognition technology. The first part of this thesis describes biometrics, biometric systems, liveness detection and the method for liveness detection is proposed, which is based on spectroscopic characteristics of human skin. The second part describes and summarizes performed experiments. In the end, the results are discussed and further improvements are proposed.
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Optical spectrometer designing
Dohnal, Marek ; Křivák, Petr (referee) ; Hudcová, Lucie (advisor)
This project focuses the problems of projection and design of optical instruments being instrumental to determination of elements in various material compounds. There are described here the structures of fundamental optical instruments and their possible variants, one of which has been chosen and further entered into details. The work specifically refers to an optical spectrometer, which by its nature, ranges the bands both of visible and near-infrared radiation. The work presents basic principles of particular parts, which the existent instrument can consist of, the advantages and disadvantages brought by the single parts. For specifically proposed configuration, intentionally set in such a way it uses state-of-the art measurement methods obtaining the best possible measurement results, the work analyzes in details the method of operation and solves numerically the theoretical assumptions for correct operation of the spectrometer. A constituent of the project is an experimental measurement testifying, with certain errors, to the theoretical solutions. The measurement errors that could result from chosen arrangement and chosen measurement method are numerically expressed in a separate sub-chapter. Further various calibration methods are mentioned, based on which the calibration method used during the experimental measurement was selected. The last part of project is focused on circumferential design of the optical spectrometer, where series of suitable circumferential elements was scrutinized. For basic elements there are presented their parameters and possible troubles related to the implementation. Furthermore the realisation of project was carried out and the spectrometer was assembled with the parts available in laboratory. The results were elaborated with a computer programme created specially for this application and then compared to a professional spectrometer.
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Model of the metropolitan optical network
Prudík, Jiří ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan area network – passive planar PCL splitter. One of the passive planar splitter are used to increase optical fibre channel. At the end of the collection a simplified examples of used measurements – optical time domain reflectometry and optical fibre transmission. Contains standard protocols or reflectogram. The conclusion of this thesis summarizes costs of FTTb (Fibre To The Building) model of optical metropolitan area network in Czech republic and future contribution for society.
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Spectrophotometry of ROS species with focus on hydrogen peroxide
Zhorný, Lukáš ; Hořavová, Lenka (referee) ; Provazník, Ivo (advisor)
The main theme of this work is spectrophotometry. The first chapter describes the theoretical problems of the topic, relevant units and formulas for calculating the absorbance of the solutions of given concentrations. Further disclosed herein is a spectrophotometer, its individual parts, and the principle on which the unit is based. The last chapter of the theoretical introduction to this work is focused on the production of ROS in living organisms and especially in plants, and then there are some spectrophotometric methods for determining the concentration of ROS. The practical part describes the method using TiCl4 and method using KI. Both methods were used to determine the hydrogen peroxide concentration and subsequent measurement of absorbance of solutions of standard hydrogen peroxide added interfering substances. Then, the statistical analysis of the measured data and the assessment of the impact of these interferents to measure absorbance. The first of these methods proved to be suitable for a given measurement.
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