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Photometry and spectroradiometry of LEDs
Vysoudil, Martin ; Škoda, Jan (referee) ; Drápela, Jiří (advisor)
This thesis deals with the processing of light technical parameters and performance of key LED chips for their applications in lighting systems. The aim is to create a laboratory model for measuring the qualitative and quantitative parameters of highly luminous light LED emitted depending on the angle, using a spherical integrator 0.3 m, goniometer and fiber spektroradiometr /luxmeters. Goniometer is designed using modular optomechanical parts company Thorlabs. Due to the current passing through the LED chips heat up considerably. To light LED chip parameters tested were not affected by heat from the chip is required to pay the heat generated by a passive radiator. Another part of this thesis is the reconstruction of an older model spherical integrator. Reconstruction must be undertaken so as to ensure sufficient cooling again tested LEDs. Light scattered in the ball of the integrator is led by the optical cable to the spektroradiometr that are subsequently recorded its parameters. The second element used to measure the light produced by the LED source is photocell. Spherical integrator must be appropriately modified to indicate the two measuring elements and also meet the standards of determining the correctness of measurement. At the end of the measurement results will be compared with catalog values provided by the manufacturer.
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Measurement of Operational Parameters of Light Sources
Motyčka, Martin ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
This semestral thesis is focused on description of operating parameters of light sources and their measurements. There are descripted light-technical, electrical and other parameters of light sources and methods of their measurements and evaluations. In tables there are ranges of fotometric quantities for most types of light sources. This thesis is also focused on functional explanation of photometric measuring instruments.
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Inovating methods for color fidelity index evaluation of LED.
Novák, Filip ; Škoda, Jan (referee) ; Motyčka, Martin (advisor)
This bachelor thesis is aimed to compare different methodologies of calculating color rendering indicators, because for modern light sources based on LED the traditional color rendering index Ra might be insufficient. The first part of this paper is based on explaining the basics, such as different methods of producing visible light, photometric quantities, or various CIE color spaces. The second and main part revolves around description of spectroradiometers, and calculation procedures for calculating color rendering indicators according to CIE 013.3-1995, CQS, IES TM-30-15, and CIE 224:2017. In the next chapter the mentioned indexes are then calculated for a given sample of light sources, and the results are subsequently evaluated.
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Light Sources
Janík, Daniel ; Bejček, Ludvík (referee) ; Havlíková, Marie (advisor)
The aim of the thesis is to introduce the basic photometric quantities and measurement of these quantities. Next target is to get acquainted with the basic types of light sources, including various types, their construction and principle of their function. The work also deals with the measurement of electrical and photometric parameters of nine samples of concrete light sources. Measured sources in terms of energy and terms of quality of the light are compared with each other and with the data supplied by the producer.
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Comparing Different Types Of Light Sources
Janík, Daniel
This article deals with the choice of an appropriate light source. Nine samples were measured and the results offer a comparison of different light sources and describe their differences. The results furthermore compare given light sources in terms of color rendering of light and luminous efficiency.
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Inovating methods for color fidelity index evaluation of LED.
Novák, Filip ; Škoda, Jan (referee) ; Motyčka, Martin (advisor)
This bachelor thesis is aimed to compare different methodologies of calculating color rendering indicators, because for modern light sources based on LED the traditional color rendering index Ra might be insufficient. The first part of this paper is based on explaining the basics, such as different methods of producing visible light, photometric quantities, or various CIE color spaces. The second and main part revolves around description of spectroradiometers, and calculation procedures for calculating color rendering indicators according to CIE 013.3-1995, CQS, IES TM-30-15, and CIE 224:2017. In the next chapter the mentioned indexes are then calculated for a given sample of light sources, and the results are subsequently evaluated.
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Light Sources
Janík, Daniel ; Bejček, Ludvík (referee) ; Havlíková, Marie (advisor)
The aim of the thesis is to introduce the basic photometric quantities and measurement of these quantities. Next target is to get acquainted with the basic types of light sources, including various types, their construction and principle of their function. The work also deals with the measurement of electrical and photometric parameters of nine samples of concrete light sources. Measured sources in terms of energy and terms of quality of the light are compared with each other and with the data supplied by the producer.
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Measurement of Operational Parameters of Light Sources
Motyčka, Martin ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
This semestral thesis is focused on description of operating parameters of light sources and their measurements. There are descripted light-technical, electrical and other parameters of light sources and methods of their measurements and evaluations. In tables there are ranges of fotometric quantities for most types of light sources. This thesis is also focused on functional explanation of photometric measuring instruments.
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Kvalita osvětlení a hodnocení zrakové pohody na pracovišti
Králiková, Ružena ; Badida, Miroslav ; Konkoly, Tomáš
The contribution deals with the evaluation of illumination of work in the manufacturing organization. The evaluation was performed by questionnaire survey and objectivised by measuring. The object of the investigation were all the staff who were willing to participate in an anonymous survey valuation visual comfort at your workplace. For the evaluation of the questionnaires were used basic statistical methods and evaluation methods of qualitative data.
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Photometry and spectroradiometry of LEDs
Vysoudil, Martin ; Škoda, Jan (referee) ; Drápela, Jiří (advisor)
This thesis deals with the processing of light technical parameters and performance of key LED chips for their applications in lighting systems. The aim is to create a laboratory model for measuring the qualitative and quantitative parameters of highly luminous light LED emitted depending on the angle, using a spherical integrator 0.3 m, goniometer and fiber spektroradiometr /luxmeters. Goniometer is designed using modular optomechanical parts company Thorlabs. Due to the current passing through the LED chips heat up considerably. To light LED chip parameters tested were not affected by heat from the chip is required to pay the heat generated by a passive radiator. Another part of this thesis is the reconstruction of an older model spherical integrator. Reconstruction must be undertaken so as to ensure sufficient cooling again tested LEDs. Light scattered in the ball of the integrator is led by the optical cable to the spektroradiometr that are subsequently recorded its parameters. The second element used to measure the light produced by the LED source is photocell. Spherical integrator must be appropriately modified to indicate the two measuring elements and also meet the standards of determining the correctness of measurement. At the end of the measurement results will be compared with catalog values provided by the manufacturer.
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