The quality and value of precious stones is determined by a set of indicators such as color, purity, dimension, type and quality of cut. This article is devoted to the problem of assessment of the color of precious stones as one of the crucial quality indicators. To date, the color is usually evaluated by an expert who relies on his/her own color perception and a set of master stones (precious stones color standards). The authors propose an alternative way of determining the color using special hardware and software and standard colorimetric techniques. On the example of green ("emerald") shades the possibility of digital classification of precious stones by color is shown.
Scientific and technological progress of recent years in the production of the light emitting diodes (LEDs) has led to the expansion of areas of their application from the simplest systems to high precision lighting devices used in various fields of human activity. However, development and production (especially mass production) of LED lighting devices are impossible without a thorough analysis of its parameters and characteristics. There are many ways and devices for analysis the spatial, energy and colorimetric parameters of LEDs. The most methods are intended for definition only one parameter (for example, luminous flux) or one characteristic (for example, the angular distribution of energy or the spectral characteristics). Besides, devices used these methods are intended for measuring parameters in only one point or plane. This problem can be solved by using a dome diagnostics system of optical parameters and characteristics of LEDs, developed by specialists of the department OEDS chair of ITMO University in Russia. The paper presents the theoretical aspects of the analysis of LED’s spatial (angular), energy and color parameters by using mentioned of diagnostics system. The article also presents the results of spatial), energy and color parameters measurements of some LEDs brands.
Scientific and technological progress of recent years in the production of the light emitting diodes (LEDs) has led to the expansion of areas of their application from the simplest systems to high precision lighting devices used in various fields of human activity. However, development and production (especially mass production) of LED lighting devices are impossible without a thorough analysis of its parameters and characteristics. There are many ways and devices for analysis the spatial, energy and colorimetric parameters of LEDs. The most methods are intended for definition only one parameter (for example, luminous flux) or one characteristic (for example, the angular distribution of energy or the spectral characteristics). Besides, devices used these methods are intended for measuring parameters in only one point or plane. This problem can be solved by using a dome diagnostics system of optical parameters and characteristics of LEDs, developed by specialists of the department OEDS chair of ITMO University in Russia. The paper presents the theoretical aspects of the analysis of LED’s spatial (angular), energy and color parameters by using mentioned of diagnostics system. The article also presents the results of spatial), energy and color parameters measurements of some LEDs brands.
The urgency of the task of analyzing the foodstuffs quality is determined by the strategy for the formation of a healthy lifestyle and the rational nutrition of the world population. This applies to products, such as chicken eggs. In particular, it is necessary to control the chicken eggs quality at the farm production prior to incubation in order to eliminate the possible hereditary diseases, as well as high embryonic mortality and a sharp decrease in the quality of the bred young. Up to this day, in the market there are no objective instruments of contactless express quality control as analytical equipment that allow the high-precision quality examination of the chicken eggs, which is determined by the color parameters of the eggshell (color uniformity) and yolk of eggs, and by the presence in the eggshell of various defects (cracks, growths, wrinkles, dirty). All mentioned features are usually evaluated only visually (subjectively) with the help of normalized color standards and ovoscopes. Therefore, this work is devoted to the investigation of the application opportunities of contactless express control method with the help of technical vision to implement the chicken eggs’ quality analysis. As a result of the studies, a prototype with the appropriate software was proposed. Experimental studies of this equipment on a representative sample of eggs from chickens of different breeds have been carried out (the total number of analyzed samples exceeds 300 pieces). The correctness of the color analysis was verified by spectrophotometric studies of the surface of the eggshell.
One of the results of intensive development of led technology was the creation of a multi-component, managed
devices and illumination/irradiation used in various fields of production (e.g., food industry analysis, food
quality). The use of LEDs has become possible due to their structure determining spatial, energy, electrical,
thermal and other characteristics. However, the development of the devices for illumination/irradiation require
closer attention in the case if you want to provide precise illumination to the area of analysis, located at a
specified distance from the radiation source. The present work is devoted to the development and modelling of a
specialized source of radiation intended for solving problems of analysis of food products, medicines and water
for suitability in drinking. In this work, we provided a mathematical model of spatial and spectral distribution of
irridation from the source of infrared radiation ring structure. When you create this kind of source, you address
factors such spectral component, the power settings, the spatial and energy components of the diodes.
The description of the LED optical-electronic lighting system of plants for stimulation of growth and maturing of fruits of different cultures is provided in this work. Also the results of experimental research on the selection of components are presented. The results of energy calculations and 3D modeling of the distribution of the radiation fluxes generated from the source are included. Moreover, the design of optoelectronic plant lighting system layout was proposed.
The problems of dressability the solid minerals are attracted attention of specialists, where the extraction of mineral raw materials is a significant sector of the economy. There are a significant amount of mineral ore dressability methods. At the moment the radiometric dressability methods are considered the most promising. One of radiometric methods is method photoluminescence. This method is based on the spectral analysis, amplitude and kinetic parameters luminescence of minerals (under UV radiation), as well as color parameters of radiation. The absence of developed scientific and methodological approaches of analysis irradiation area to UV radiation as well as absence the relevant radiation sources are the factors which hinder development and use of photoluminescence method. The present work is devoted to the development of multi-element UV radiation source designed for the solution problem of analysis and sorting minerals by their selective luminescence. This article is presented a method of theoretical modeling of the radiation devices based on UV LEDs. The models consider such factors as spectral component, the spatial and energy parameters of the LEDs. Also, this article is presented the results of experimental studies of the some samples minerals.
Development of lighting technology has led to possibility of using LEDs in the specialized devices for outdoor, industrial (decorative and accent) and domestic lighting. In addition, LEDs and devices based on them are widely used for solving particular problems. For example, the LED devices are widely used for lighting of vegetables and fruit (for their sorting or growing), textile products (for the control of its quality), minerals (for their sorting), etc. Causes of active introduction LED technology in different systems, including optical-electronic devices and systems, are a large choice of emission color and LED structure, that defines the spatial, power, thermal and other parameters. Furthermore, multi-element and color devices of lighting with adjustable illumination properties can be designed and implemented by using LEDs. However, devices based on LEDs require more attention if you want to provide a certain nature of the energy or color distribution at all the work area (area of analysis or observation) or surface of the object. This paper is proposed a method of theoretical modeling of the lighting devices. The authors present the models of RGB multicomponent light source applied to optical-electronic system for the color analysis of mineral objects. The possibility of formation the uniform and homogeneous on energy and color illumination of the work area for this system is presented. Also authors showed how parameters and characteristics of optical radiation receiver (by optical-electronic system) affect on the energy, spatial, spectral and colorimetric properties of a multicomponent light source.
Quality control of different coatings (colorful, paint, marker, safety, etc.) that are applied to the surface of various objects (both metallic and non-metallic) is an important problem. Also, there is a problem of dealing with counterfeit products. So it’s necessary to distinguish the fake replicas of marking from the authentic marking of producer. To solve these problems, we propose an automated apparatus for analysis and control of spectral reflection characteristics, albedo and color parameters of extended (up to 150 mm × 150 mm) flat objects. It allows constructing the color image of the object surface as well as its multispectral images in different regions of the spectrum. Herewith the color of the object surface can be calculated for various standard light sources (A, B, C, D65, E, F2, F7, F11, GE), or to any light source with a predetermined emission spectrum. The paper presents the description of working principles of the proposed apparatus as well as the results of reflection and multispectral analysis of different flat objects.
KEYWORDS: Light sources, Light emitting diodes, Software development, Light sources and illumination, Visible radiation, LED lighting, Multi-element lenses, Chemical elements, Diodes, Control systems
The intensive development of LED technologies resulted in the creation of multicomponent light sources in the form of controlled illumination devices based on usage of mentioned LED technologies. These light sources are used in different areas of production (for example, in the food industry for sorting products or in the textile industry for quality control, etc.). The use of LED lighting products in the devices used in specialized lighting, became possible due to wide range of colors of light, LED structures (which determines the direction of radiation, the spatial distribution and intensity of the radiation, electrical, heat, power and other characteristics), and of course, the possibility of obtaining any shade in a wide dynamic range of brightness values. LED-based lighting devices are notable for the diversity of parameters and characteristics, such as color radiation, location and number of emitters, etc. Although LED technologies have several advantages, however, they require more attention if you need to ensure a certain character of illumination distribution and/or distribution of the color picture at a predetermined distance (for example, at flat surface, work zone, area of analysis or observation). This paper presents software designed for the development of the multicomponent LED light sources. The possibility of obtaining the desired color and energy distribution at the zone of analysis by specifying the spatial parameters of the created multicomponent light source and using of real power, spectral and color parameters and characteristics of the LEDs is shown as well.
For today the development in lighting technologies, in particular the creation of powerful extended and multicomponent
sources, occupies a leading position in the field of innovation. The development of mentioned lighting devices is not
possible without providing of careful control for parameters and characteristics both of the each source’s emitting
element and of the entire lighting device as a whole. There are many various devices and measuring complexes, intended
for verification and evaluation of extended and multicomponent light sources parameters and characteristics. However,
none of them enables the simultaneous analysis of the spatial distribution of illuminance, color and spectral
characteristics as well as power settings parameters of extended or multicomponent light sources. This problem can be
solved by using of automated hardware and software complex for extended light sources verification, developed by the employees of the chair of optical-electronic devices and systems of St.-Petersburg national research university of
information technologies, mechanics and optics in Russia. The paper presents the theoretical and practical aspects of the extended and multicomponent light sources spectral and color characteristics analysis as well as the results of
illuminance distribution investigation in three-dimensional space for some kinds of light sources. In addition, we present the experimental results of several types of extended and multicomponent light sources with different shape, order and quantity of the emitting elements, spectral and energy characteristics of the radiation.
Scientific and technological progress of recent years in the production of the light emitting diodes (LEDs) has led to the expansion of areas of their application from the simplest systems to high precision lighting devices used in various fields of human activity. However, for all technology development at the present time it is very difficult to choose one or another brand of LEDs for realization of concrete devices designed for the implementation of high precision spatial and color measurements of various objects. In the world there are many measurement instruments for determining the various parameters of LEDs, but none of them are not capable to estimate comprehensively the LEDs spatial, spectral, and color parameters with the necessary accuracy and speed. This problem can be solved by using an automated hardware-software system for LED’s verification and certification, developed by specialists of the OEDS chair of National Research University ITMO in Russia. The paper presents the theoretical aspects of the analysis of LED’s spatial, spectral and color parameters by using mentioned of automated hardware-software system. The article also presents the results of spatial, spectral, and color parameters measurements of some LEDs brands.
LEDs have many advantages over traditional lighting, such as high brightness, small size, broad range of wavelengths
being emitted and ability to be placed with high density over flat or even-shaped surface. This offers promising choice
for many industrial and consumer applications and especially important for machine vision applications, where bright
and homogeneous illumination offers better visibility of features of interest. This can be obtained both with
multicomponent source configuration and analysis of distribution of optical energy density and color on an illuminated
surface. Required illuminating properties are produced by multicomponent source with certain structure and power
configuration. In this paper it is shown how to obtain required color and energy distribution on the surface of interest by
varying parameters of multicomponent source (matrix dimension, the distance between elements in the matrix, the
distance between the source and illuminated surface, etc.). Superposition of individual elements spectra is also taken into
account. This paper has proposed technique of the RGB multicomponent source simulation, which provides
homogeneous illumination on a flat surface of interest both in optical energy density and color. The ripple of luminance
on the surface shouldn't exceed the value of 2%.
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