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Detection of closure of chamber doors for an electron scanning microscope
Obšitník, Michal ; Drexler, Petr (oponent) ; Nešpor, Dušan (vedoucí práce)
The aim of this work is to design a suitable sensor for the detection of the chamber door position in an electron scanning microscope when the pressure in the vacuum chamber is changed and a control program is assembled to the selected sensor. The detected motion is within one millimeter. In the first part, the work is aimed at getting acquainted with the principle of functioning of the electron scanning microscope and with the basic types of sensors for position and mechanical force detection. Subsequently, the sensors are compared according to three basic categories: price, range, and resistance to external influences. Selected theory-based sensors are tested to exclude inappropriate sensors from use. After testing, the Interlink FSR-402 resistance sensor is selected. The scheme is connected to the sensor and the operation control program is created. The result of this work is a force sensing sensor, which is triggered by the pressure of chamber door on the chamber wall when creating a vacuum and a control program that controls the results measured from the sensor and adjusts them as required.
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RFID Reader for 13.56 MHz Band
Obšitník, Michal ; Zamazal, Michal (oponent) ; Povalač, Aleš (vedoucí práce)
The aim of this thesis is to design an RFID reader for the 13.56 MHz band and to compile a control program. In the first part, the work is aimed at getting acquainted with the principle of operation of RFID and NFC technologies, together with the related international standard, and at getting familiarized with the various transceivers available to operate these technologies. Because the transceiver for the further evaluation is clearly specified in the assignment, their comparison serves a purely informational purpose. In the practical part, the task is to design and revive a prototype RFID reader. The base of the project is a reader board carrying out RFID communication, audiovisual response, and connection to an OLED display. This board is connected to a microcontroller, which controls the whole device. Another part of the project is set of different antennas that can be connected to the reader board and replaced at any time. The manufactured antennas are subject to a testing of how two different tuning methods affect their operation. The maximum reading distance, success of the performed readings and value of the electrical current that is a result of the calibration process are being tested. The output of the thesis is an RFID reader with a control program.
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RFID Reader for 13.56 MHz Band
Obšitník, Michal ; Zamazal, Michal (oponent) ; Povalač, Aleš (vedoucí práce)
The aim of this thesis is to design an RFID reader for the 13.56 MHz band and to compile a control program. In the first part, the work is aimed at getting acquainted with the principle of operation of RFID and NFC technologies, together with the related international standard, and at getting familiarized with the various transceivers available to operate these technologies. Because the transceiver for the further evaluation is clearly specified in the assignment, their comparison serves a purely informational purpose. In the practical part, the task is to design and revive a prototype RFID reader. The base of the project is a reader board carrying out RFID communication, audiovisual response, and connection to an OLED display. This board is connected to a microcontroller, which controls the whole device. Another part of the project is set of different antennas that can be connected to the reader board and replaced at any time. The manufactured antennas are subject to a testing of how two different tuning methods affect their operation. The maximum reading distance, success of the performed readings and value of the electrical current that is a result of the calibration process are being tested. The output of the thesis is an RFID reader with a control program.
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Detection of closure of chamber doors for an electron scanning microscope
Obšitník, Michal ; Drexler, Petr (oponent) ; Nešpor, Dušan (vedoucí práce)
The aim of this work is to design a suitable sensor for the detection of the chamber door position in an electron scanning microscope when the pressure in the vacuum chamber is changed and a control program is assembled to the selected sensor. The detected motion is within one millimeter. In the first part, the work is aimed at getting acquainted with the principle of functioning of the electron scanning microscope and with the basic types of sensors for position and mechanical force detection. Subsequently, the sensors are compared according to three basic categories: price, range, and resistance to external influences. Selected theory-based sensors are tested to exclude inappropriate sensors from use. After testing, the Interlink FSR-402 resistance sensor is selected. The scheme is connected to the sensor and the operation control program is created. The result of this work is a force sensing sensor, which is triggered by the pressure of chamber door on the chamber wall when creating a vacuum and a control program that controls the results measured from the sensor and adjusts them as required.
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