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Analyse of photovoltaic solar cells by the photoluminescence method
Baura, Tomáš ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This thesis deals with the analysis of solar cells by photoluminescence method. Photoluminescence method is based on the excitation of luminescence radiation of the solar cell material by an external excitation light source. This method can detect various types of defects in the material solar cells. The main objective is the design and realization of a measuring system defects of solar cells, which is based on this method. For excitation of luminescence is used LED array. For the detection of luminescence is used CCD camera with IR optical filter. To filter out the excitation light radiation is used disc screen and optical interrupter. The parameters and options of this measuring system are verified and characterized by test measuring for example the achievable rotation speed of screen and response of optical interrupter. At the end is tested detection of luminescence radiation of solar cells in the measuring system. The measured images are compared with the method of electroluminescence.
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Diagnostic methods for the evaluation of the state of a timber structure
Balas, Ondřej ; Anton, Ondřej (referee) ; Heřmánková, Věra (advisor)
This thesis is focused on the description and evaluation of selected diagnostic methods used for a survey of timber structures in the field. The first part of the thesis describes a structure and characteristics of wood; the other part provides a description of diagnostic methods followed by determination a level of injury and verification material characteristics of the particular element in the timber structure. The main aim of the thesis is to compare the diagnostic methods for the evaluation of the state of timber structures and verification of their application in practice.
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Diagnostic method of solar cells operating at very low temperatures
Bartoň, Jiří ; Stojan, Radek (referee) ; Veselý, Aleš (advisor)
This work deals with the modern diagnostic methods of defects detection of solar cells. Defects are detected by electroluminescence and photoluminescence methods. The main focus of this work is an innovation workplace for measuring solar cell defects at very low temperatures using photoluminescence. Liquid nitrogen is used to cooling solar cells. By using low temperatures can be detection methods to obtain more objektive results of diagnostic defects.
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Software for LBIC method
Kučera, Filip ; Veselý, Aleš (referee) ; Vaněk, Jiří (advisor)
This thesis is focused on one of the diagnostic methods of fotovoltaic cells the LBIC (Light Beam Induced Current) method and the experimental measurement set-up for this method, which is operated by the Department of Electrical and Electronic Technology in Brno. The principle of photovoltaic cells function, the possibly used material and the problems usually encountred during production are described in this work,. There is also a review of methods that can be used to detect defects in photovoltaic cells. The main part is devoted to the proposal of a new experimental set-up for the measuring LBIC method and software development for this set-up. There is a proposal of a new method of measurement, which is also implemented using the development environment Borland C + +. Newly developed software for this method allows simpler operation and more efficient measurements.
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Diagnostic methods for the evaluation of the state of a timber structure
Rusz, David ; Komárková, Tereza (referee) ; Heřmánková, Věra (advisor)
This thesis is focused on implementation and subsequent evaluation of selected diagnostic methods for a survey of timber structure. The first part of thesis describes wood structure and characteristics, the next part is about diagnostic methods followed by diagnostics of specific element of timber structures. The main aim of the thesis is to compare nondestructive, minor destructive and destructive methods for timber structures and their application in the practice.
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The possibilities of diagnosis of dyslexia in children
Matějovská, Lucie ; Morávková Krejčová, Lenka (advisor) ; Mertin, Václav (referee)
The research study focuses on the development of new appropriate tools suitable for dyslexia assessment of primary school children (grades sixth to ninth), and a process of their pilot standardization. The inspiration was found in the existing tests for different age groups and methods used abroad. Four newly created tests were included into the test battery (test of visual perception, phonological manipulation, auditory segmentation and rapid automatized naming) as well as two already existing tests, which are a part of the validation study (test of auditory discrimination from Novak's Diagnosis of specific learning disabilities battery and Symbol search subtest from Wechsler intelligence scale for children). The research group consisted of 155 students of primary school (grades sixth to ninth), 61 dyslectics and 94 intact students. The results between the intact group and the dyslexic group differed significantly in all tests. The test of phonological manipulation showed the strongest differentiation. The study includes a correlation analysis between the tests and norms created for both groups. The presented predictive model was able to correctly identify 77.4 % of "cases" in relation to the criterion dyslexic - intact group.
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The possibilities of diagnosis of dyslexia in children
Matějovská, Lucie ; Morávková Krejčová, Lenka (advisor) ; Mertin, Václav (referee)
The research study focuses on the development of new appropriate tools suitable for dyslexia assessment of primary school children (grades sixth to ninth), and a process of their pilot standardization. The inspiration was found in the existing tests for different age groups and methods used abroad. Four newly created tests were included into the test battery (test of visual perception, phonological manipulation, auditory segmentation and rapid automatized naming) as well as two already existing tests, which are a part of the validation study (test of auditory discrimination from Novak's Diagnosis of specific learning disabilities battery and Symbol search subtest from Wechsler intelligence scale for children). The research group consisted of 155 students of primary school (grades sixth to ninth), 61 dyslectics and 94 intact students. The results between the intact group and the dyslexic group differed significantly in all tests. The test of phonological manipulation showed the strongest differentiation. The study includes a correlation analysis between the tests and norms created for both groups. The presented predictive model was able to correctly identify 77.4 % of "cases" in relation to the criterion dyslexic - intact group.
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Analyse of photovoltaic solar cells by the photoluminescence method
Baura, Tomáš ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This thesis deals with the analysis of solar cells by photoluminescence method. Photoluminescence method is based on the excitation of luminescence radiation of the solar cell material by an external excitation light source. This method can detect various types of defects in the material solar cells. The main objective is the design and realization of a measuring system defects of solar cells, which is based on this method. For excitation of luminescence is used LED array. For the detection of luminescence is used CCD camera with IR optical filter. To filter out the excitation light radiation is used disc screen and optical interrupter. The parameters and options of this measuring system are verified and characterized by test measuring for example the achievable rotation speed of screen and response of optical interrupter. At the end is tested detection of luminescence radiation of solar cells in the measuring system. The measured images are compared with the method of electroluminescence.
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Diagnostic method of solar cells operating at very low temperatures
Bartoň, Jiří ; Stojan, Radek (referee) ; Veselý, Aleš (advisor)
This work deals with the modern diagnostic methods of defects detection of solar cells. Defects are detected by electroluminescence and photoluminescence methods. The main focus of this work is an innovation workplace for measuring solar cell defects at very low temperatures using photoluminescence. Liquid nitrogen is used to cooling solar cells. By using low temperatures can be detection methods to obtain more objektive results of diagnostic defects.
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Software for LBIC method
Kučera, Filip ; Veselý, Aleš (referee) ; Vaněk, Jiří (advisor)
This thesis is focused on one of the diagnostic methods of fotovoltaic cells the LBIC (Light Beam Induced Current) method and the experimental measurement set-up for this method, which is operated by the Department of Electrical and Electronic Technology in Brno. The principle of photovoltaic cells function, the possibly used material and the problems usually encountred during production are described in this work,. There is also a review of methods that can be used to detect defects in photovoltaic cells. The main part is devoted to the proposal of a new experimental set-up for the measuring LBIC method and software development for this set-up. There is a proposal of a new method of measurement, which is also implemented using the development environment Borland C + +. Newly developed software for this method allows simpler operation and more efficient measurements.
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