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    Wyświetlanie 1-4 z 4
    Tytuł:
    Method of determining photobiological safety of contemporary light sources
    Autorzy:
    Pawlak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/134950.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    photobiological hazard
    ultraviolet radiation
    infrared radiation
    visible radiation
    blue light hazard
    risk group
    safe exposure time
    lighting source
    light emitting diode (LED)
    Opis:
    The article presents a method of evaluating irradiance, spectral irradiance, and spectral radiance, for purposes of determining risk groups of sources of light. The description of the method of measurement of radiance incorporates standard and alternative methods. Measurement methods were developed on the basis of general requirements and diagrams incorporated in the standard PN-EN 62471: 2010. The paper classifies risk groups of sources of light in terms of photobiological hazards and exposure limits when skin is at risk of being damaged by visible and infrared radiation. Threshold values of emissions for the continuous sources of radiation studied are presented. The article describes environmental conditions under which the measurements are to be taken, and requirements applicable to the process of light source aging. In addition, technical assumptions are presented, and the design of the test stand for measuring optical radiation parameters is described.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 29-36
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of selected parameters of compact fluorescent lamps during their long-term operation
    Autorzy:
    Tabaka, Przemyslaw
    Rózga, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/220694.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lighting technology
    compact fluorescent lamp
    energy efficiency
    light source
    luminous flux
    Opis:
    This article is focused on considerations based on experimental studies concerning changes of selected parameters of identical compact fluorescent lamps (CFLs) intended for use in buildings during their operation. The studies constituted a long-term experiment whose goal was an evaluation of selected operating parameters of the CFLs in terms of meeting the requirements set out in the specified regulations as well as the issue of marking the lamps with the energy efficiency class. The measurements were performed with the authors’ experimental setup consisting of original equipment designed and made especially for the purpose of the measurements. The studies covered registration of the luminous flux as well as selected electrical parameters such as active power, current and the power factor during the so-called “start-up time” and operation time equal to 100 h, 500 h, 1000 h, 2000 h, etc. with a 1000 h step. The studies were finished with the moment of natural burnout of the CFLs tested. The results showed that the biggest drawback of CFLs is lack of preservation of the required time to reach 60% of the stabilized luminous flux just after short time of lamp operation. Similarly when assessing the conformity of the parameters declared by the manufacturer that have been verified, it can be stated that they are true only at the initial stage of lamp operation.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 541-557
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements and analysis selected power quality parameters in systems with LED light sources
    Autorzy:
    Putz, Ł.
    Kurzawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97575.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electroluminescent diode
    experimental setup
    LED source
    higher harmonics
    lighting installation
    power quality
    THD ratio
    Opis:
    The article describes the measurements of power quality parameters of load which is mapping the lighting installation of LED sources. Study were performed on a specially constructed the experimental setup which allows for the measurement of electrical parameters and distortion from electroluminescent lighting. In the paper quoted the legal basis in the field of power quality, referring to the Standards: PN EN 50160 “Voltage characteristics of electricity supplied by public electricity networks” and PN–EN 61000 “Electromagnetic compatibility (EMC)”. Also has been presented a comparative study of LED light sources from various manufacturers, working individually and in a group. Shown the waveforms of current intensity and the bar graphs of higher harmonics of current. Additionally has been plotted the characteristics of total harmonic distortion ratio of current intensity THDi in the relation to the active power cooperating LED lamps. Finally the results of research has been analyzed and summarized.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 551-561
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental setup to research power quality parameters in systems with LED light sources
    Autorzy:
    Putz, Ł.
    Kurzawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97734.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electroluminescent diode
    experimental setup
    LED source
    higher harmonics
    lighting installation
    power quality
    THD ratio
    Opis:
    The article describes the design, construction and research capabilities the experimental setup for measure the parameters of power quality of load which is mapping the lighting installation of LED sources. The standing has been build in order to study the disruption comes from the electroluminescent lighting mostly. The construction of standing also allows conducting the experimental research with the equipment which could improve the quality of electricity. In the paper quoted the concept of the power quality according to suggestion of Advisory Committee on Electromagnetic Compatibility (ACEC). Also has been presented the causes and consequences of exceeding the permissible values of power quality parameters. In the publication has been described the procedure for preparing and setting up the experimental setup for measuring the higher harmonics of current flowing through the tested LED lighting.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 541-550
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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