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Very low temperature measurement
Mráz, Dominik ; Harabiš, Vratislav (referee) ; Chmelař, Milan (advisor)
This bachelor thesis is focused on low temperature measurement, respectively on temperature sensors classsification, their accuracy, temperature range and linearity. It deals especially in use of these sensors in cryogenic applications. It contains temperature sensor block diagram, including the description of each block. It also contains schematic designs with description of each design’s function, components and the reason why it’s used. Additionally the realization of the temperature sensor is described and it’s testing.
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Realization of the control device for a temperature chamber
Obšil, Martin ; Levek, Vladimír (referee) ; Čožík, Ondřej (advisor)
The bachelor‘s thesis deals with the realization of the temperature chambre control. In first part there are definitions of different types of the power regulation. In the second part of this work are approached an infrared ceramic heaters and a heat transfer by radiation. The third section is about realization this device. There are explanations of realization of each part. The whole circuit is controlled by a microprocessor which also controls the power section with triac which regulates power on the infrared ceramic heater. The next part deals with a design of the printed circuit boards. In the fifth section is desctription of the software and in conclusion there are demonstrated results of the work.
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Microsolder controlled by microprocessor
Stavělík, Jiří ; Petyovský, Petr (referee) ; Macho, Tomáš (advisor)
This thesis describes circuit design and realization of the power and control system, which can hold constant temperature of solder tip. Control system is based on microcontroller Atmega328 of company Atmel, part of the work is the implementation and debugging control software. This solution allows to enter temperature by rotary encoder and to show the real temperature on LCD displey. This hardware also detects disconnection of solder tip, acoustic signals when the required temperature is reached and it holds last set temperature.
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Using the infrared camera in the measuring technique
Bayer, Robert ; Šedivá, Soňa (referee) ; Bejček, Ludvík (advisor)
The goal of this thesis is to get acquainted with contactless methods of measuring a temperature and give the reader an idea of it. Next goal is to master the working with IR visual display terminal FLUKE Ti55FT (and program equipment SmartView) a describe it to the reader too. Last goal is to translate the booklet "Introdution to Thermography Principles", published by FLUKE company, which will be enclosed in electronic form to the thesis in the appendix.
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Optimization of location specimens in temperature chamber
Severa, Tomáš ; Pulec, Jiří (referee) ; Šandera, Josef (advisor)
This work is focused on the temperature distribution in thermal chamber CTS. The temperature in the chamber is measured using thermocouples. The measured values are graphically plotted and evaluated. The temperature distribution in the chamber is simulated in ANSYS Workbench. After optimization of the thermal decomposition, is carried out simulations with DPS. It describes the temperature chamber CTS module Omega TC - 08 and software for the thermal simulation ANSYS Workbench.
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Calculations of temperature fields on the model of induction motor
Koníček, Pavel ; Makki, Zbyněk (referee) ; Janda, Marcel (advisor)
The aim of this work is to get acquainted with the construction of induction motor, the calculation of temperature fields in the motor model in ANSYS Workbench and subsequent evaluation of the results for different operating conditions. There is provided a general description of the function and design of induction motor, a summary of sources of heat inside the engine design, heat transfer theory, the basic description of the finite element method and ANSYS Workbench description. Furthermore, comparison of temperatures measured on a real engine with the values obtained from the calculation program.
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Response time of thermometers
Novák, David ; Radil, Lukáš (referee) ; Foral, Štěpán (advisor)
The aim of the work is the analysis of the characteristics of resistive and termočlánkových sensors, the description of their principle, basic parameters, structural design and last but not least is probably the most important part of the work of the explanation, analysis and practical experiment to see the time constant of the sensor. In the first part of the thesis explains the basic concepts and principles of thermal quantities of phenomena. Then it is done the basic classification of methods of measuring temperature with the inclusion of the main points of the content of this work. The next section will deal with the main issues of the work. First comes an explanation of the nature of resistive sensors and is explained in the next chapter the principle of thermocouples. The following is the chapter on the construction of the sensors. Here is a design of the sensor for the dismantled the practical use in industry and in other applications.. In the next chapter is described in detail at the issue of the time constants of the sensor. This chapter contains not only an explanation of this concept, but also to derive equations for the description of sensor behavior important in changing the conditions of real traffic. The following is the part where they are dismembered influences affecting the time constant of the device. These effects can significantly affect the otherwise high accuracy thermometers mentioned above. The last chapter deals with practical measurement of time constants specified thermometers. The measurement was carried out in two different environments, in boiling water and warm air. The assessment of the results of the measurements showed that the time constant in an environment of boiling water is significantly smaller than in the case of hot air, and that for all of the measured objects.
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Emisivity and its Impact on the Heat Conductivity
Gančev, Jan ; Hejátková, Edita (referee) ; Szendiuch, Ivan (advisor)
This work deals with the issue of emissivity and its impact on the heat dissipation.The first part describes the basics of thermal management, the issue of emissivity and its measurement. In the second, experimental part, are dedicated the emissivity values of examined specimens. These values are then used as initial conditions for the thermal simulation. In the last part are compared the measured results and the simulated results and is evaluated the impact of emissivity for the heat dissipation.
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Loop Powered Field Instrument with HART Interface
Kunz, Jan ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
This diploma thesis describes design and development of creating field instrument demonstration kit. Kit is capable of measuring multiple sensors such as thermocouples, RTDs, or pressure sensors, analogue sensor simulation is also provided. Sensor’s side is isolated from output, which is composed of 4 - 20 mA current loop and HART interface. Current loop also provides power supply and kit can communicate via HART also when alarm current (3,2 mA) is set. Basic safety features like open wire detection, over and undervoltage protection are also implemented.
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