LED modules emitting a luminous flux, implement near-field luminance distribution or colorimetric distribution depending on emitters location. In the far field there is complete mixing of luminous flux, both in terms of quantity as well as because of distribution color parameters. To achieve these mixing light in a short distance of the LEDs is necessary to use optical elements. The article presents the results of creating light distribution and luminance by using the ring optical elements with truncated outer surfaces.
An optical guide, in which propagated light beams undergo spectral distortion due to dispersion and nonlinear damping of the optical medium. This results in a change to the colorimetric parameters of the white light introduced into the optical path. The geometric shape of the end-face optical fiber as well as the position of the source influence the change of the distribution of the primary source spectrum. The article presents measurements of colour temperature nearest to CCT as well as the colour rendering index Ra (CRI) of the light-and-true optical for a number of selected optical guides.
This article presents basic metrological properties of selected integrated color sensor models. The study involved MTCSiCS and MMCS6 sensors, produced by MAZeT. Describes electronic circuits necessary for reading data from the color sensor. The analysis shows the relative characteristics of spectral sensitivity of the detectors, the linearity characteristics of the output signal as well as the useful range.
KEYWORDS: Sun, Solar energy, Servomechanisms, Global Positioning System, Solar radiation, Solar cells, Photovoltaics, Sensors, Microcontrollers, Amplifiers
Actinometric station is using for measuring solar of radiation. The results are helpful in determining the optimal position of solar panels relative to the Sun, especially in today’s world, when the energy coming from the Sun and other alternative sources of energy become more and more popular. Polish climate does not provide as much energy as in countries in southern Europe, but it is possible to increase the amount of energy produced by appropriate arrangement of photovoltaic panels. There is the possibility of forecasting the amount of produced energy, the cost-effectiveness and profitability of photovoltaic installations. This implies considerable development opportunities for domestic photovoltaic power plants. This article presents description of actinometric system for diffuse radiation measurement, which is equipped with pyranometer - thermopile temperature sensor, amplifier AD620, AD Converter ADS1110, microcontroller Atmega 16, SD card, GPS module and LCD screen.
During the past years significantly increased the number of LED models available on the market. However, not all of them have parameters which allow for use in professional lighting systems. The article discusses the international standards which should be met by modern LEDs. Among them, one of the most important parameters is factor of luminous flux decline in value during the operation of the LEDs. Its value is influenced by many factors, among others, the junction temperature of the diode and average and maximum values of supply current. Other important, for lighting reasons, parameters are stability of correlated color temperature and stability of chromaticity coordinates of the emitted light. The paper presents a system to measure luminous flux and colorimetric parameters of LEDs. Measurement system also allows for measuring a change in these parameters during operation of the LED.
The basic, well-known of the fiber task is to transmit the optical signal along an optical fiber. To achieve this, you should reduce energy losses which result from reflections on the border of core - clad. However, in some cases, the light output can be derived by side surface the fiber. Luminous flux through side surface of optical fiber is realized in many ways. It is possible to change local shape of cylindrical fiber or scattering light on border between core and clad. Side optical fiber with helical spiral core have a different way of side emission. It is the result of controlled scattering inside the optical fiber [1].
Side optical fibers developed at the University of Technology in Bialystok allow the absorption of light. This enables the construction of safe sensors with a distributed detection surface and unique properties. Rotationally - symmetric geometry of the fiber allows the construction of measuring heads for mean cylindrical and semi-cylindrical illuminance . This article presents the construction and measurement results for the application of side optical fiber in measurements of cylindrical and semi-cylindrical illuminance.
This paper describes electrical method for measuring junction temperature of high power LEDs. Designed and
constructed system with thermal chamber and performed a number of studies in typical operating conditions luminaires
with LEDs. The results allow for proper construction of a complete LED lighting system using for operation in ambient
temperatures ranging from -10ºC to 100ºC, especially in terms of matching the effective supply.
The advantage of fiber optic data transmission systems is their insensitivity to electromagnetic radiation, in which
the optical fiber. Some exemplary applications of fiber optic transmission in power electronics and electric drives
which due to their specific job bring significant electromagnetic interference. Electrical signal wires are in an area
of very strong electromagnetic field so that the transmission distortion may occur. The paper presents existing and
possible applications of optical links using optical fibers, in the control of power systems.
Control systems of our computers are common devices, based on the manipulation of keys or a moving ball. Completely
healthy people have no problems with the operation of such devices. Human disability makes everyday activities become
a challenge and create trouble. When a man can not move his hands, the work becomes difficult or often impossible.
Controlled optical keyboard is a modern device that allows to bypass the limitations of disability limbs. The use of
wireless optical transmission allows to control computer using a laser beam, which cooperates with the photodetectors.
The article presents the construction and operation of non-contact optical keyboard for people with disabilities.
This paper presents information about detection of radiation by using side light optical fibers. The idea of the angular dislocation sensor is based on utilization of cylindrical optical fibers with performed prismatic disturbance. Shaped side optical fibers are used mainly in lighting, but they can be also applied in angular detection of radiation.
In the paper the battery energy storage system is presented. 40 kVA BES was installed in Electrical Drive and Power
Electronics Department of Bialystok Technical University. The article presents the new way of control the battery energy
storage through the active power filter. Because of the power coefficient cosφ decrease and input current deformation the
battery energy storage system was equipped with active filter to current distortion elimination. The active power filter's
control system uses the optical track which is based on optical fibre. Insensibility important is on the large
electromagnetic field in the arrangement of control. This assures the optical system. The test of the implementation of the
optical track was introduced in the arrangement IPM among the control system and inverter.
The article presents information about shaped optical fibers, which emit radiation light across side, cylindrical surface
of optical fiber. Be presented the examples - solutions of measurements of shaped optical fiber.
Article presents new method of design light flux emission in forming optical fibers, with side light emission. This method of design gave a possibility to design side surface of core, to obtain assumption of light flux distribution.
Article presents new method of design light flux emission in forming optical fibers, with side light emission. This method of design gave a possibility to design side surface of core, to obtain assumption of light flux distribution.
The work presents the analysis of the luminous flux distribution in the transverse section of a fibrous optical fibre, in the function of
distance from the fibre input face. The simulation is based on the Monte Carlo method of light calculations carried out with the use
of specialist software. The simulation results refer to the distribution of luminance and the fibre efficiency depending on the applied light source.
The following paper presents results of simulations and calculations of the Monte Carlo based flux method employed for analysis of the luminous flux distribution in "side-light" optical fibers. The characteristics of the luminous flux emitted from the side surface of the optical fiber were presented for various total, internal reflection coefficients and variable geometric parameters.
The article presents the results of examinations concerning distribution of the luminous flux in the end-light lighting optical fibers, in which the end-surface was subject to deliberate shaping. A method for shaping the distribution of the luminous flux in lighting optical fibers was designed, devoid of using sockets and any additional heads shaping luminous intensity distribution.
This article aims at presenting the attempt of quantitative description of luminous flux distribution in the side-light optical fibers. The basic relations, regarding emission of the luminous flux are presented here. Construction of an algorithm, aiming at calculating balance of the radiation emitted from side-light optical fiber, was proposed.
In this paper, opto-technical properties of a modern material for optical energy transmission -- Optical Lightning Film -- were described. Luminous intensity index curves for the OLF film samples were presented. Various usages of the given material both in lighting and optical fiber areas were discussed.
This paper discusses reasons for changes in spectral composition of optical radiation emitted from side-surfaces of side-light optical fibers. Results of measurements of radiation spectrum against distance from the front-surface of the side-light, solid-core optical fiber were presented.
The following article presents the results of research connected with modeling lighting optical fibers of the "side-core" type. Distribution of the luminous flux was caused by its emission from the surface of the cladding, which is modified in such a way that its refractive index is larger than the refractive index of the material of the core. Luminous intensity and luminance of the model optical fiber curves were also determined; their suitability for lighting was also evaluated.
The following article presents the results of research connected with modeling lighting optical fibers of the 'side-core' type. Distribution of the luminous flux was caused by its emission from the surface of the cladding, which is modified in such a way that its refractive index is larger than the refractive index of the material of the core. Luminous intensity and luminance of the model optical fiber curves were also determined, their suitability for lighting was also evaluated.
KEYWORDS: Optical fibers, Light sources and illumination, Solar radiation, Solar concentrators, Solar energy, Optical fiber cables, Sun, Sensors, Signal attenuation, Light sources
This paper presents concepts of lighting systems using artifial light and natural solar radiation in illuminating rooms; it shortly exhibits systems for obtaining energy of solar radiation with the use of concentrators and heliostats following the Sun in its movement.
Article introduces description of position to marking of basic parameters of light lightings' optical fibers. Acquaintance of photomoetric parameters gives use of optical fibers to lightings' aims.
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