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Fresnel Incoherent Correlation Holography (FINCH)
Bouchal, Petr ; Zemánek, Pavel (referee) ; Chmelík, Radim (advisor)
This master’s thesis develops a novel method of digital holography, from recent studies known as Fresnel Incoherent Correlation Holography (FINCH). The method enables the reconstruction of the correlation records of three-dimensional objects, captured under quasi-monochromatic, incoherent illumination. The experimental system is based on an action of a Spatial Light Modulator, driven by computer generated holograms to create mutually correlated beams. Both optical and digital parts of the experiment can be carried out using procedures of classical holography, diffractive optics and digital holography. As an important theoretical result of the master’s thesis, a new computational model was proposed, which allows to describe the experiment completely with respect to its two basic phases. The proposed model allows to understood the method intuitively and can be used additionally for analysis and interpretation of the imaging parameters and the system optimalization. The theoretical part of the master’s thesis also presents a detailed description of the correlation imaging based on an appropriate reconstruction process. Computational models were developed for both monochromatic and quasi-monochromatic illumination. In experimental part, all theoretical results were verified. The imaging parameters were examined using standard resolution target tests and appropriate biological samples. As an original experimental result, spiral modification of the system resulting in a vortex imaging was proposed and realized. Here, a selective edge enhancement of three-dimensional objects is possible, resulting in a significant extension of possible applications of the method.
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Optimization of technological parameters of injection plastic parts
Hamáček, Richard ; Hlaváček, Martin (referee) ; Kandus, Bohumil (advisor)
This project is dealt with optimalization of moulding procedure of plastic housing of headlamp for project DCW 204 Mopf halogen. The aim is reach a shorter injection moulding cycle time with keeping of claim quality of plastic part. Optimalization will be done based on modification of moulding pressing time. We observe warpage in axis X in the most problematical points of housing by using of contactless measuring optical technologie ATOS III Triple Scan. Simulation analysis for injection moulding was used for prediction of housing warpage up to unforming in every chosen moulding pressing time. According to reaching data in this way comparison of predicted warpage was able to done up to unforming time and real warpage of housing after unforming. According to reaching data in a different period of time warpage of housing during time flowing was observed.
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New Experimental Setup for Study of Physical Processes Preceding Specimen Failure
Vavřík, Daniel ; Bryscejn, Jan ; Holý, T. ; Jakůbek, J. ; Jakůbek, M. ; Valach, Jaroslav ; Vykydal, Z.
Failure of a high ductile specimen usually precedes a decrease of the loading force under the condition of displacement control in the monotonic loading. Unfortunately, the elastic energy stored in the standard loading equipment can result in sudden failure within very short time corresponding to the loading unstability. We can prolong this time interval by reducing the elastic energy in the loading equipment. The proposed new loading frame fulfils the indicated requirement and enables extraordinary precise displacement loading control even beyond the maximal loading force. Plastic deformation on a surface is investigated by the optical Method of Interpolated Ellipses and together with damage processes inside of the specimen are simultaneously observed by the X-ray Dynamic Defectoscopy method.
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Optical Convertors
Chleboun, Jan ; Dostál, Otto (referee) ; Filka, Miloslav (advisor)
Optical converters are used in various types of optical networks to provide end-users of data and voice services and also allow reception of television broadcasting, which is transmitted through optical media. The current trend is the construction of FTTH networks (Fiber To The Home), which, thanks to optical fibre, have reduced the speed or capacity, as in the case with metallic networks. The proposal is the need to consider positive and negative factors associated with building of concrete network with a specified number of users and location. Each network consists of passive and active components. Passive can be used for transmission of information, therefore they are mainly elements transmission medium. Active part includes elements for sending and receiving information transmitted by optical media. Transmitters vary their technical implementation, quality and reliability. This obviously affects the price of both active and passive parts. The cost of the operation of the network are also increased with demands of control. The advantage is the efficient management, which is guaranteed by return of the cost to build a FTTH network. Optical network with a system of remote management converters is a new trend of optical communications.
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CWDM technology for optical wireless links
Kumpán, Vítězslav ; Zvánovec, Stanislav (referee) ; Wilfert, Otakar (advisor)
In this work an optical wireless test link for studying of atmospheric phenomena in the optical bands of 830 nm and 1550 nm is described. The WDM technology involving technology of optical fibers is included into transmitter of the link. The measuring devices for measuring power, spectrum and polarization control are included into receiver of the link. The outcomes of this work are both measuring chain design and verification of its functionality.
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Magnetic nanostructures for recording and optical sensors
Lišková, Eva ; Višňovský, Štefan (advisor) ; Maryško, Miroslav (referee) ; Postava, Kamil (referee)
Title: Magnetic nanostructures for recording and optical sensors Author: Eva Lišková Department: Institute of Physics, Charles University Supervisor: Prof. Ing. Štefan Višňovský, DrSc. Abstract: Magneto-optical (MO) spectra of multilayered structures with enhanced MO effect were studied using the polar and longitudinal Kerr spectroscopy with oblique angle of light incidence in the photon energy range 1.2 eV to 5 eV. The samples with Fabry- Perot cavity like architecture, were modeled using Yeh matrix formalism. Two sets of samples, with composition FeF2/Fe/FeF2 and AlN/Fe/AlN, were prepared by molecular beam epitaxy and sputtering. The relations were studied between the position of the enhanced peak in the MO spectra and the structure. Second part of this work was devoted to the Pt/Co/Pt structures and the influence of the ion implantation on MO spectra and structural composition. The studied multilayer structures present interest for MO sensor and memory applications. Keywords: Magneto-optical Kerr effect, Magneto-optical sensor, Fabry-Perot resonator, Ion implantation
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Confirmation of presence of chemical grouts in grouted rocks - proving methods
Ščučka, Jiří ; Vaculíková, Lenka
The confirmation of a presence of chemical grouts in the pore system of fine-grained soils or in the fine cracks of grouted rocks and engineering constructions is a common requirement in the laboratory analyses of geocomposite material (polyurethane resin+rock/soil, polyurethane resin+building material). The combination of two analytical methods can be used for the reliable detection of the injection medium in the grouted rock environment: optical fluorescence microscopy+digital image processing, - Fourier transform infrared (FTIR) spectroscopy of the powdered rock/soil sample.
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