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Programmable I/O control module for driving electrical machines
Jež, Roman ; Šandera, Josef (referee) ; Stehlík, Jiří (advisor)
This work deals with design and realization device intended for control of procesess in automation. The general aim is design and development of device containing digital inputs, digital outputs, analog outputs, LCD display and keyboard communicating with standard elements in automation. This device use serial line RS232 for communication with aplication executed in program Control Web 2000.
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Vibration system control through embedded system
Genčanský, David ; Stehlík, Jiří (referee) ; Szendiuch, Ivan (advisor)
The importance of vibration and vibration tests is increasingly relevant given th growing number of mobile electronic devices. This thesis descibes the design of control vibrating shaker table, which is an essential element for vibration testing. At the beginning is an initial look on the problematics of vibration, vibration test and influences of vibrations on electronic components, solder joints and other parts uses in microelectronics. Provides insight to the principles of vibration measurement and controlling system used in industry. The workplace is designed for testing and measuring of vibrations. The workplace designed and developed in the LabVIEW enviroment based on CompactRIO platform.
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Methods of frequency stabilization of semicondutor lasers
Kozelský, Adam ; Stehlík, Jiří (referee) ; Mikel, Břetislav (advisor)
The main aim of the thesis is a frequency stabilization of the DFB semiconductor laser diodes. The temperature stability of the laser diode chip, the stability and the noise of the injection current and the backward reflections are the crucial parameters which affects the frequency stability. These influences are described and the resolution is proposed. The theory of the external methods of the frequency stabilization and the comparison of these methods is presented. One method was choosed and this method was realized for 760 and 1540 nm wavelength laser diodes. In this method was used the frequency stabilization based on the linear absorption to the spectral lines of the gases. The diploma work is closed by the measured results of the frequency stability of the used laser diodes and by the comparison of level of stability achieved by the other methods.
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VFA and CFA comparison
Vystrčil, Marek ; Hubálek, Jaromír (referee) ; Stehlík, Jiří (advisor)
This bachelor's thesis is focused on comparison of operational amplifiers structures with voltage (VFA) and current (CFA) feedback. In the theoretical part there is an analysis properties of operational amplifiers. Attention is paid to advantages of particular amplifiers in concrete networks. The practical part contains the simulations of those networks with an aim to assess characteristic properties and a difference between applied circuits. I used the operational amplifier µA741 for the simulation of the structure VFA. I used the amplifier AD8011 for the simulation with current feedback. I added the theoretical and practical differences between comparative structures.
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CFA application
Mikláš, Jan ; Havlíček, Tomáš (referee) ; Stehlík, Jiří (advisor)
The project is aimed at detailed analyse characteristics of (CFA – Current Feedback Amplifier) and realize an fitting aplication to demonstrate accomplishments as compared with voltage feedback amplifier (VFA).
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Electronic detector for thin-film gas microsensors
Rozštípil, Jakub ; Stehlík, Jiří (referee) ; Hubálek, Jaromír (advisor)
The general aim of Master’s thesis is to design and execute electronics in the SMT device view for thin film gas sensors and to study principle of gas sensor functionality based on semiconducting oxides. The SMT device contains temperature controller and electronics which is able to scan the concentration of gas on the sensor surface. It is designed for controlling of four sensors and has to communicate with computer for setting of initial conditions and scanning of concentration of gas. The practical part of Master’s thesis contains design and construction of electronics and software making.
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