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This paper is focused on the description and comparison the alternative photometric and radiometric methods for liquid dielectric quality diagnostic and parameters measurement, long-term practical verification and comparison of obtained data with conventional methods. The proper function and accuracy of the measured methods are verified in the Light Laboratory and in the CVVOZEPowerLab in Brno University...
This paper is focused on the description of phenomenon called "floating water bridge" and several experiments in our high voltage laboratory which are joined with this phenomenon. Water bridges bring some new knowledge in chemistry, electrochemistry, lighting technology and high voltage field. In this paper we will be dedicated space for describing the properties of water bridges in the...
This paper deals with theme of measuring of photobiological safety. For evaluating of photobiological safety is important determination of visual angle of source. Paper is describing effect of visual angle change on measured data. Visual angle was changed by changing of measuring distance and by changing of field stop diameter. All measurement was realized on double monochromator spectroradiometer.
This article has task to inform a reader of uncertainties of measurement in laboratory of light, especially in integrating sphere. In the first part there are mathematical descriptions of different types of uncertainties, including the methodology for their determination. The second part is focused on detailed description of particular standard uncertainties for measurement of the luminous flux in...
The aim of this paper is to determine the amount of materials which are used in the light sources construction. Another aim of this paper is to identify environmental demands in the production and disposal of light sources on the basis of the material composition.
Laboratory testing of high voltage tested objects often leads to creation of discharges. Discharges are generated by breakdowns or flashovers outer insulation of the tested objects. These discharges generate emission in the IR, UV and also in the spectrum of light. The spectrum and intensity of radiation is dependent on the duration and level of passing current discharge. The shape, density and the...
High voltage capacitors are widely used in middle and high voltage laboratories and testing rooms. Capacitors are used for measurement of voltage in the form of voltage dividers. Injection and blocking capacitors are placed in the galvanic systems of partial discharges. And high voltage capacitors are also used in the high voltage as the part of laboratory bridge circuits. Common characteristics of...
The aim of the paper is to compare of light sources for household use. These sources are compared due to content of blue light in their spectrum. Classical bulb, halogen bulb, linear fluorescent lamp and LED retrofits were used for spectrum measurement. It was used fluorescent lamp and LEDs with various colour temperature.
The aim of the paper is to find out how the luminous flux of fluorescent lamps depends on the change of the source position. Linear fluorescent lamps, compact fluorescent lamps and circular fluorescent lamps were used for measurement. Linear and circular fluorescent lamps were measured in the horizontal and vertical position, the compact fluorescent lamp was measured with the slot facing down, and...
Article describes the design of lighting in growth chamber with low energy consumption. For this purpose we created a special luminaire that allows during different phases of plant life, regulate the spectrum of emitted energy and thereby effectively utilize light without wasting electricity. It is also important light intensity for proper growth of plants, respectively incident radiation. The paper...
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