National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Inductive Sensors
Šimberský, Michal ; Havránek, Zdeněk (referee) ; Bejček, Ludvík (advisor)
Bachelor thesis deals with inductive sensors. The thesis introduced the history of sensors, their advantages and disadvantages over other types of sensors. There are described different types of inductive sensors. Each type of sensor is described in terms of physical principles. In thesis there are listed examples of using different types of practice. Preparation was constructed to demonstration the characteristics and differences between eddy currents sensors and inductive oscillator sensors.
Remote fault monitoring system
Jarůšek, Jakub ; Trčka, Tomáš (referee) ; Škarvada, Pavel (advisor)
In practice, optical non-contact measurement of distance and displacement is divided into various methods that use a different parameter of the optical (light) signal. Some methods are explained in the work. The triangulation method is described in more detail. This method is used to measure and monitor the displacement of geological faults. For this monitoring, a low-budget device is designed, which uses lasers and a sensor to determine the displacement of the measured object in a certain time interval. The whole system will serve as verification of data measured by magnetoresistive sensors.
Long term optical monitoring technique of displacement fields based on ArUco markers
Kunecký, Jiří
In structural engineering it is often needed to measure tiny displacements of parts of the structure extremely precisely. For such a purpose it is often needed to use some type of sensor attached to the surface of the structure. This paper presents a new technique which simply uses computer vision libraries to measure displacement of markers originally developed for robotics. Such analysis can be under specific circumstances (2D planar movement) valid if we compare two images taken at different times with the same camera. Main advantage of this method is simplicity of use and low cost of markers, which can be printed in a standard office laser printer. The resolution (error) can be for standard cameras around 0.1 pixel. The method is especially developed for research of timber frames/joints behavior in real structures, because displacements of joints in creep or under load can reach an amplitude which is perfectly detectable by this method.
Remote fault monitoring system
Jarůšek, Jakub ; Trčka, Tomáš (referee) ; Škarvada, Pavel (advisor)
In practice, optical non-contact measurement of distance and displacement is divided into various methods that use a different parameter of the optical (light) signal. Some methods are explained in the work. The triangulation method is described in more detail. This method is used to measure and monitor the displacement of geological faults. For this monitoring, a low-budget device is designed, which uses lasers and a sensor to determine the displacement of the measured object in a certain time interval. The whole system will serve as verification of data measured by magnetoresistive sensors.
Large displacement and deformation measurement by frequency sweeping digital holography
Psota, P. ; Lédl, Vít ; Kaván, František ; Matoušek, O. ; Doleček, R.
Recently, a digital holographic method called Frequency Sweeping Digital Holography (FSDH) for high precision measurements of surface topography of mechanical parts has been introduced. The greatest advantage of the presented FSDH is the fact that the measurement is absolute. i.e. optical path difference is independently retrieved in every single pixel. This approach can therefore be used also for measurement of large displacements and deformation. FSDH is particularly suitable in cases where the common digital holographic methods fail due to e.g. 2π unambiguity problem or speckle decorrelation. Measurement method principles, setup details, an some features of the method are discussed.\n
Inductive Sensors
Šimberský, Michal ; Havránek, Zdeněk (referee) ; Bejček, Ludvík (advisor)
Bachelor thesis deals with inductive sensors. The thesis introduced the history of sensors, their advantages and disadvantages over other types of sensors. There are described different types of inductive sensors. Each type of sensor is described in terms of physical principles. In thesis there are listed examples of using different types of practice. Preparation was constructed to demonstration the characteristics and differences between eddy currents sensors and inductive oscillator sensors.
Determination of vertical displacements of the building for the purpose of real estate management.
PAZDEROVÁ, Veronika
This bachelor thesis called Determinatoin of vertical displacements of the building for the purpose of real estate management deals with measurement of vertical displacement of the building. The thesis introduces also legal enactments, public notices and standards associated with the measurement of vertical displacements of the building. It describes the mistakes in measurement and accuracy rate in detail. The aim of this thesis is to assess the results of measurement documents created in individual stages of the costruction and compare them with the values and results of the every measurement.
Optimalizace měření rychlosti pulzní vlny v tepnách
Macková, H. ; Chlup, Hynek ; Hulan, M. ; Žitný, R.
Measurements of the pulse wave velocity (PWV) in human arteries are important for two different reasons: an early diagnostics of atherosclerosis and identification of material properties of the vessel wall for numerical simulations. The PWV in blood vessels is not constant and classical methods of pressure wave shift between two points are not sufficient. We consider three methods: optical measurements of vessel wall displacement in several points by high speed camera, continual optical measurements of vessel wall displacement by correlator Q-450 and measurements of flow rate and displacements by ultrasonic device. The first method can determine the PWV only between several points. The second method can show 3D reconstruction of displacements with very good resolution. The ultrasound measurements need combination of Doppler ultrasound velocimetry and B-scan imagining. However, the common devices used in medicine do not have any data output. It causes bad resolution.

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