Diffuse Radiator of Variable Brightness Based on Matrix of Light-Emitting Diodes with the Scatterer
Keywords:Metrology, Radiometric measurements, Digital optoelectronic systems, Optical radiometry, Matrix photodetectors
Background. Lately there has been a rapid development of digital optoelectronic systems with matrix photodetectors, but further improvement of these systems is largely constrained by insufficient methods and tools for measuring their energy characteristics.
Objective. The purpose of this article is to develop a new method of calculation and analysis of the radiator of variable brightness based on matrix of light-emitting diods with the scatterer.
Methods. A system with the matrix light-emitting diodes and the scattering glass is used as a diagram of the radiator. The dependence of the brightness on the output aperture of the radiator on its design parameters is investigated. Its mathematical modeling and search for the most appropriate values of the individual parameters are carried out.
Results. A new method of calculation and analysis of the radiator with the scatterer based on the account of influence of the spatial structure of the matrix and the point spread function or function scattering line of the scattering element was worked out. The basic parameters of the radiator with the scatterer were given. There were the step of the matrix of light-emitting diodes and coefficient of the indicatrix providing the minimum heterogeneity of radiation and the maximum brightness of the output aperture.Conclusions. The results have shown that the proposed scheme of the radiator is perspective for measuring the energy characteristics of the matrix photodetectors of the digital optoelectronic systems.
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