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Research and Development of Modern Emission MEMS Sensors
Pekárek, Jan ; Husák, Miroslav (referee) ; Vlach, Radek (referee) ; Vrba, Radimír (advisor)
The dissertation thesis is focused on research and development of modern emission MEMS sensors. The emission sensor based on the field emission from nanostructured materials represents innovative approach to pressure sensing. The nanostructures serve as electron emitter in an electric field between the cathode and anode in the pressure sensor. This electric field is constant and the change in ambient pressure causes the change of distance between electrodes, thereby the electric field is increasing. This intensity is proportional to the emission from the cathode made of nanostructured material. Changing the distance between the electrodes is caused by the deflection of the deformation element - the membrane, which operates the measured pressure. In the current state of the art an extensive research is carried out to find new nanostructured materials with good emission properties. Four nanostructured materials have been chosen and then experimentally prepared and characterized inside the vacuum chamber. For the simulation of diaphragm bending, the chamber is equipped with linear nano-motion drive SmarAct that enables precise changes of the distance between two electrodes inside the vacuum chamber. The computer model to predict the deformation of diaphragm was prepared in the simulation program CoventorWare. The behavior of diaphragm in a wide range of dimensions of the membrane, its thickness and the applied pressure are possible to predict. The dependencies of the current density on the electric field are plotted from the measured emission characteristics of nanostructured materials and thus characterized nanostructured materials can be compared. The dependencies are further converted by Fowler-Nordheimovy theory on the curve (ln(J/E2) vs. 1/E), whose advantage is linear shape. Basic parameters describing the emission properties of characterized nanostructured materials are deducted. Two methods for vacuum packaging of the sensor electrodes are designed. Anodic bonding technology and encapsulating using glass frit bonding are tested. To evaluate the bonding strength, the bonded substrates are tested for tensile strength.
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Automatized working place for measuring of airflow parameters
Smělý, Jakub ; Vejlupek, Josef (referee) ; Vlach, Radek (advisor)
This thesis describes the design work for the measurement of air values. The first part describes the airflow, pressure build-up in pipes and losses due to airflow losses. There is also a description of fans and explain their characteristics depending on the pressure generated by airflow. The next part describes the design of the measuring chamber, electronics and control for fully automatic measurement of air quantities.
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Development of Laser Welded Common Rail with Radial Connected Pressure Sensor (RPS)
Šantavý, Ivo ; Skrutek, Ivo (referee) ; Ramík, Pavel (advisor)
This dissertation deals with a development of a laser welded common rail with a radially attached RPS sensor of pressure. The new concept required by Bosch Diesel s.r.o. Jihlava should be more modifiable and it should be easily integrated with the engine compartment. In this dissertation I suggested a number of concepts that I further analysed, verified in appropriate software, developed, and finally narrowed the selection down to the most suitable solution, which is recommended and justified in the conclusion.
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Pressure sensor made 3D structure
Hanus, Martin ; Pekárek, Jan (referee) ; Kosina, Petr (advisor)
This thesis deals with the points at issue of a 3D structure pressure sensor. The pressure sensor converts pressure into another physical quantity which is easier measure and which is processed subsequently. Usually ways of pressure sensing is for example capacitive, strain-gauge and optical. The 3D structures are constructed through the use of a LTCC technology, which can be laminated to create multi-layer structures, compared to standard high-temperature ceramics. Passive circuit components can be applied onto particular ceramic layers using either thin-layer or thick-layer technology. Practice part of thesis deals with several ways of construction a pressure sensor. First of all capacitive, strain-gauge and optical sensor and possible problems with construction individual sensors above all problems with lamination, cavity or burning
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Project Pretrigger
Veverka, David ; Pavlík, Michal (referee) ; Háze, Jiří (advisor)
Práce se zabývá návrhem stabilního a rychlého bezdrátového spojení mezi dvěma body. K vytvoření tohoto spojení bude použita technologie Bluetooth a nebo její moderní alternativy vzhledem k tomu, že tato technologie již byla v daném pracovním prostředí testována a byla prokázána její stabilita. V této práci a v navazující diplomové práci budou diskutovány výsledky časových analýz zvolených senzorů, komunikace mezi senzorem a zvoleným mikrokontrolerem a nakonec návrh kompletního řešení, na jehož základě bude vytvořen funkční prototyp požadovaného zařízení.
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Application of Thick Films in the Modern Electronics
Somer, Jakub ; Urban, František (referee) ; Szendiuch, Ivan (advisor)
Tato diplomová práce se zabývá technologií tlustých vrstev a jejím možným použitím pro nekonvenční aplikace. První část práce je rešeršní a zaměřuje se především na aplikace tlustovrstvé technologie v různých oblastech použití. V teoretické části práce je dále popsána technologie LTCC, včetně technologických postupů výroby. V praktické části jsou řešeny dvě aplikace v tlustovrstvé technologii. Jedná se návrh a výrobu vysokofrekvenčního filtru a optického senzoru tlaku technologií LTCC. V závěru práce jsou provedena měření a jsou zhodnoceny dosažené výsledky.
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Digital signal of pressure senzors processing using CPLD
Zátura, Michal ; Fedra, Zbyněk (referee) ; Kováč, Michal (advisor)
The goal of this bachelor’s thesis is to design electronic part of the scanning system used to measure altitude. The electronic part is designed as module connected to the development platform XC2-XL. This module is realized like PCB. The principles of the signal processing of the signal from the pressure sensor MPXH6250, particular blocks of the designed module and principle of the barometrical altitude measuring are also described in this thesis. Thesis briefly informs about designing environment Xilinx ISE, VHDL language, the principle and the application of the pressure sensors, the structure of the programmable logic device CPLD and FPGA, the development platforms XC2-XL, the Xilinx Spartan-3 Starter Kit, the programmable logic devices CPLD Coolrunner-II XC2C256 and Spartan-3 XC3S200 FPGA used on the development platforms. The very important part is to design algorithm for processing the logarithm in the digital logic and it´s implementation in VHDL language.
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Fuel Systems of SI-engines
Faiman, Jiří ; Drápal, Lubomír (referee) ; Dundálek, Radim (advisor)
The aim of this work is to create a list of fuel systems used in modern gasoline engines and describe the basic components of these systems. It will then be described the function of each of these components and modes of operation of the fuel system at different modes of engine operation. Finally, will be characterized by the selected engines with these systems.
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