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Monitoring equipment of degradation processes for material of animal origin
Chmelař, Vít ; Skácel, Josef (referee) ; Adámek, Martin (advisor)
The diploma thesis introduces the reader to the problems of chemical sensors and the basics of degradation processes in materials of animal origin. It describes some types of sensors and their principles. Atmel ATmega328 microprocessor, its parameters and programming are described. In the next part of the thesis there is a proposal and production of equipment for monitoring of degradation processes in materials of animal origin. Sample sof chicken and milk were mesuared. From these measurements, the gas concentration values were determined, where samples can be considered suitable for consumation.
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Hot plate with power regulation
Lacika, Marek ; Skácel, Josef (referee) ; Búran, Martin (advisor)
This thesis deals with issues of used hot plates and thick-film technology. The theoretical part of diploma thesis contains a theoretical analysis and description of corresponding technology and usage of materials. The practical part of the thesis focuses on the design of the resulting device, which forms design of the test and optimized hot element, the initial design of the device and the design of models for temperature simulations. Then follows description of the practical realization of the motifs and testing of the created thick-film structure on a ceramic substrate. In the last part are shown simulations of heat transfer in the proposed model of the device.
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Design of a fluidizing device for encapsulation
Lizúch, Ján ; Skácel, Josef (referee) ; Otáhal, Alexandr (advisor)
The aim of a bachelor´s thesis is to design and construct a model of fluidized bed for encapsulating a hybrid integrated circuits. A theory about hybrid integrated circuits, their packages, principles of fluidized bed and about organic materials suitable for fluidization is included in a first part of the thesis. Next parts of the thesis discusses a design of a theoretical model and its practical construction part. Thesis also contains a part about fluidization process optimalization for a specific encapsulating material.
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Prediction of resistivity for thick film rezistor
Kolařík, Jaroslav ; Otáhal, Alexandr (referee) ; Skácel, Josef (advisor)
This work deals with issue the thick-film technology. Especially this work focuses on trimming value of resistance thick-film resistors. First part is dedicated to create the thick-film and thick-film resistors, trim technology and trim cuts. Next part is design of thick-film resistor and test substrate with resistors. The following is a description of the production the test substrate. Next part thesis deals with practical creation cuts into thick-film resistors by AUREL ALS300. The following is an experimental part dealing with the simulation of thick-film resistor with different trim cuts in the ANSYS Workbench. The last part is for practical verification of simulations measurement by the FLIR SC660 thermovision camera. At the end are evaluated knowledge of the properties of the trim cuts.
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Design of a device for scratch tests
Brandejs, Petr ; Otáhal, Alexandr (referee) ; Skácel, Josef (advisor)
This thesis deals with designing a scratch tester. Theoretical part introduces scratch testing, with focus mainly on testing adhesion and layer toughness in microelectronics. Second chapter deals with research of commercially available scratch tester parameters. Based on the findings, construction, and electronics of a device capable of performing scratch tests with required parameters were designed. In the end, a few scratch tests were performed to show capabilities of the device.
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Optimization of the switching power supplies with synchronous rectifier
Skácel, Josef ; Macháň, Ladislav (referee) ; Žák, Jaromír (advisor)
This thesis deals with switching circuit topic, especially switching power supplies. There are switching circuits without inductance and their benefits presented in the thesis. Basic topologies of switching power supplies, their properties, application area and functions of basic types of converters are also described. The next section focuses on special resonant switching power supplies and synchronous. The main part of the work is carried out simulations using three synchronous rectifiers. The work includes practical design of an SMPS with synchronous rectifier.
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Submicrosecond digita trigger
Valík, Jan ; Skácel, Josef (referee) ; Levek, Vladimír (advisor)
The bachelor thesis deals with theoretical basis to design and manufacture the device, which triggers digital edges at 32 inputs in total, timestamps them at submicrosecond time base and sends out via EtherCAT industrial protocol to superior control system. The research on existing solutions and the design based on their selection and task limitations will be done, the device will be manufactured and measurements will be taken to provide final judgement on their fit of task definition.
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Software for the processing of multidimensional data from gas sensors
Almazov, Denys ; Skácel, Josef (referee) ; Adámek, Martin (advisor)
This work deals with realization and testing software for processing multidimensional data from a gas sensor. This work introduces readers to some multidimensional data processing method. The part of work is a description and usage PCA method, description of the smell or taste detection device – electronic nose, realisation and testing of the program for preprocessing and processing data. Preprocessing data program can visualise data from device on the graf in real time and save it to the file. Data processing program can read data from file, decrease their dimensionality and visualize results in 2D graf. This program was tested on a simple electronic nose that contains three sensors.
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Study of BGA and QFN package properties
Skácel, Josef ; Psota, Boleslav (referee) ; Szendiuch, Ivan (advisor)
This work deals with the issue of packaging and heat transfer. Especially this work focused on QFN and BGA packages. Nowadays most sophisticated conventional solution. First part deals with analysis of the current status of packages. Next part is analyze the issue of heat transfer in electronic systems. The following section is an experimental dealing with simulation in ANSYS Workbench and validation of these simulations by designed test structures. At the end is evaluated properties and behavior of these packages.
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Development and characterization of new method of interconnection between leads and thick film layer
Hurtík, Pavel ; Skácel, Josef (referee) ; Otáhal, Alexandr (advisor)
This work deals with different ways of interconnection between leads and thick film. It also includes the development and characterization of a new method of connecting leads, namely spot welding on thick film technology. The tips of the welding pen were modified to reduce the size of the resulting welds. To achieve a better-quality connection is used galvanic platting of contact pads. Final welds were then tested by mechanical strength testing (shear test, peel-test) and the optical method of evaluating the quality of the weld using metallographic cutting was used. Using this technology, a new inseparable connection can be achieved.
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