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Wyszukujesz frazę "LED source" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
An accurate model of LED luminaire using measurement results for estimation of electrical parameters based on the multivariable regression method
Autorzy:
Sikora, Roman
Markiewicz, Przemysław
Rózga, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2106413.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LED light source
LED luminaire
linear regression
electrical parameters measurement
Opis:
Light sources and luminaires made in the LED technology are nowadays widely used in industry and at home. The use of these devices affects the operation of the power grid and energy efficiency. To estimate this impact, it is important to know the electrical parameters of light sources and luminaires, especially with the possibility of dimming. The article presents the results of measurements of electrical parameters as well as luminous flux of dimmable LED luminaires as a function of dimming and RMS supply voltage. On the basis of the performed measurements, a model of LED luminaire was developed for prediction of electrical parameters at set dimming values and RMS values of the supply voltage. The developed model of LED luminaire has 2 inputs and 26 outputs. This model is made based on 26 single models of electrical parameters, whose input signals are supply and control voltages. The linear regression method was used to develop the models. An example of the application of the developed model for the prediction of electrical parameters simulating the operation of an LED luminaire in an environment most similar to real working conditions is also presented.
Źródło:
Metrology and Measurement Systems; 2022, 29, 2; 251--269
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of multi-emitter tuneable led source for endoscopic applications
Autorzy:
Błaszczak, Urszula J.
Gryko, Łukasz
Zając, Andrzej S.
Powiązania:
https://bibliotekanauki.pl/articles/220437.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
measurement
medical applications
LED
tuneable source
Opis:
In this paper we describe our own construction of a tuneable light source based on a set of light emitting diodes covering the visible spectrum using a homogenizing rod instead commonly used low energy-efficient integrating spheres. The expected prime application of the source is a medical endoscopic system, however it is possible to use it also for other purposes requiring both multispectral operation and a tuneable white light source. We describe the construction of the source and include precise characterization of the output white light - distribution of CCT, Duv, ∆u’v’ and colour rendering indexes (Ra, R9, Rf, Rg) of light in several planes located at various distances. The obtained results prove that our source is characterized by very good colour rendition according to the Ra and Rf method for various correlated colour temperatures (2700-6500) K. As an example of application images of the Macbeth colour chart registered with an RGB camera included in the laboratory measurement stand are presented. The obtained results prove that, after whole system calibration, this source can be used in many applications, where evaluation of objects requires precise analysis of their colour and multispectral procedures.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 153-169
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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