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Tin dioxide based semiconducting gas sensors
Gablech, Imrich ; Pytlíček, Zdeněk (referee) ; Prášek, Jan (advisor)
This project is aimed at semiconductive gas sensors based on tin dioxide. In the first part, gas sensors are divided depending on their principal of functionality. Next part is about functionality of tin dioxide gas sensors and the possibilities of active layer modification. Experimental describes gas sensor from its drawing until construction, testing and characterization. Several microelectronic technologies such as thin-film, thick-film, LTCC, spray-coating or wire-bonding were used for constructing the sensor. In the last part properties of gas sensors and differences in functionality between modified and unmodified gas sensor are summarized.
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High resolution ammeter
Honek, Marek ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
A transmission electron microscope is a device operating on a similar principle as an optical microscope. The fact that electrons wavelength is much shorter than the wavelength of photons is used to obtain huge magnifications. Glass lenses commonly used in the optical microscope are therefore replaced by magnetic coils in the electron microscopes. A magnetic field is directly proportional to the current passing through these coils. It is important to the current supplied to the coils to be as stable as possible to achieve high resolution. The goal of this thesis is to analyze usable current measurement methods and to design a current stable measuring device with a resolution of 1 ppm.
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High resolution ammeter
Honek, Marek ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
A transmission electron microscope is a device operating on a similar principle as an optical microscope. The fact that electrons wavelength is much shorter than the wavelength of photons is used to obtain huge magnifications. Glass lenses commonly used in the optical microscope are therefore replaced by magnetic coils in the electron microscopes. A magnetic field is directly proportional to the current passing through these coils. It is important to the current supplied to the coils to be as stable as possible to achieve high resolution. The goal of this thesis is to analyze usable current measurement methods and to design a current stable measuring device with a resolution of 1 ppm.
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Tin dioxide based semiconducting gas sensors
Gablech, Imrich ; Pytlíček, Zdeněk (referee) ; Prášek, Jan (advisor)
This project is aimed at semiconductive gas sensors based on tin dioxide. In the first part, gas sensors are divided depending on their principal of functionality. Next part is about functionality of tin dioxide gas sensors and the possibilities of active layer modification. Experimental describes gas sensor from its drawing until construction, testing and characterization. Several microelectronic technologies such as thin-film, thick-film, LTCC, spray-coating or wire-bonding were used for constructing the sensor. In the last part properties of gas sensors and differences in functionality between modified and unmodified gas sensor are summarized.
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