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Tilt sensors
Hájek, Tomáš ; Caha, Luděk (referee) ; Beneš, Petr (advisor)
The topic of the Bachelor's thesis are MEMS sensors of inclination, which find their use inside integrated circuits, equipment of aerospace and automobile industry, but also in ordinary electrical appliance. The work serves the reader to build a grasp over production, usage, basic principles. Finally, it offers an overview of sensors to ease the orientation on the market. The design of the physical model, which can be used to prevent the sensor from apperance of mathematical errors, is tested in the practical part.
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Modelling of differential current amplifier
Polák, Josef ; Šotner, Roman (referee) ; Jeřábek, Jan (advisor)
The aim of my diploma thesis was programming of systems for measuring AC, DC and impedance measurements. Each measuring system measures selected characteristics of current amplifier with controllable amplification DACA_N. Control programs I have created in Agilent VEE Pro 9.2. The measured data are stored to executable files in MS Excel for further processing. With created measurement programs I made measurements of eight current amplifiers. The results of individual measurements I compiled into graphs and compared with each other circuit characteristics of amplifiers. Then there is described controlling and connection of current amplifier and its construction. At the end the diploma thesis describes amplifiers with the worst and the best measured circuit characteristics. The measured values show that the amplifier DACA_N with slight differences works by theoretical assumptions and measurement systems suggested by me work with no problem.
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Modeling of Inertial Sensors
Trličík, Jakub ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This master thesis deals with measurement and modeling of MEMS inertial sensors. This paper describes basic principles of inertial sensors along with their most often errors. The next part shows results from inertial sensor market analysis, which enabling a selection of sensors to be measured. The following two chapters present methods for inertial sensor modeling and testing. The biggest part of text is dedicated to presentation of measurement results showing us static measurement of Allan variance, Earth rotation, temperature dependent bias and dynamic measurement of gyroscope sensitivity testing over temperature. In the last part of the thesis is presented a design of sensor error model by autocorrelation function and Allan variance and also an evaluation of achieved results.
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Controlling of camera
Tylš, Ladislav ; Valach, Soběslav (referee) ; Richter, Miloslav (advisor)
This thesis describes the principles of making application which is able to set and control camera. The first part describes basic camera connections and it explains definition and specification of camera’s features. The second part of my thesis describes implementation of application, which can use more cameras to image preview, image acquisition and to simply set of camera’s features. To implement the applications we can use MATLAB and C++BUILDER uses opencv libraries.
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Strain Gage amplifier
Kneblík, Adam ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The thesis deals about method of gain signals from strain gauge bridges. There are mentioned some signal conditioning methods for bridges amplifiers and charactered their properties. In the next part of this thesis are calculated the amplifier errors for various temperature. There are projected individual variants of strain gage amplifiers (instrumentation amplifier AD524, isolation amplifier, switched capacitor based instrumentation amplifier), their properties are compared with strain gage amplifier Vishay P-3500.
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Countertrade
Žižková, Alena ; Tlapa, Martin (advisor) ; Krčál, Adam (referee)
The topic of this bachelor thesis is a countertrade with a focus on offsets. The first chapter generally describes the countertrade and its different types and motives that lead to the use of these operations. The second and third chapter focuses on the legislation in the field of offset programs, examples of real offsets and at the same time it tries to evaluate their impact on the economy of the Czech Republic and Switzerland. The fourth chapter tries to compare the offsets programs in both countries simultaneously emphasizing the pros and cons that these operations can bring to these countries.
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Comparison of hip joint offset in resurfacing arthroplasty and standard total hip arthroplasty
ČERNÁ, Helena
Comparison of hip joint offset in resurfacing arthroplasty and standard total hip arthroplasty. Summary The subject of this work is to compare a hip joint biomechanical parameters after two different operations, after a standard total hip arthroplasty and after hip surface replacement. Material and method: A group of twenty five patients with a hip surface replacement has been processed in a statistical way, their average age was 55 years (from 34 to 66 years), next a group of thirty patients with a standard total hip arthroplasty and the average age was 62 years in this group (from 46 to 72 years). Anteroposterior radiographs of the pelvis with inside rotation about 15{$\rm^o$} was taken of all patients. The measured biomechanical parameters were femoral offset and femoral length, cup offset and cup height. For statistical processing the total offset was defined as a sum of the femoral offset and cup offset, hip length was defined as femoral length minus cup height. Postoperative measured data of an operated hip joint were compared with preoperative data. Statistical analysis has been done by a paired t-test. Results: The patients, who underwent an operation of hip surface replacement, were in average by 7.8 years younger than the patients with a standard total hip arthroplasty. Men predominated in the group with surface replacement and women predominated in the group with a standard total hip arthroplasty. Preoperative measured data were approximately identical in both groups. In the group with a surface replacement the postoperative total offset has increased in average by 0.04 cm (p=0.79) and hip length has decreased in average by 0.41 cm (p=0.0001). The postoperative total offset has decreased in average by 0.83 cm (p=5x10-5) in the group with a standard total hip arthroplasty and the postoperative hip length has decreased in average by 1.49 cm (p=6.17x10-5). Conclusion: On the basis of taken paired t-tests the hypothesis can be substantiated that a surface replacement restores hip joint physiological conditions better than a standard total hip arthroplasty.
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