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I. O. Spiridonov - One of the best experts on this subject based on the ideXlab platform.

Evgeniy V. Sypin - One of the best experts on this subject based on the ideXlab platform.

  • Simulation of Electro-Optical Device for Fire Detection on Basis of Spectral Pyrometry Method
    2020 21st International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2020
    Co-Authors: Aleksey Yu. Sidorenko, Sergey A. Lisakov, Andrey I. Kin, Evgeniy V. Sypin
    Abstract:

    Simulation of a high-speed Electro-Optical Device for fire detection based on a spectral pyrometry method was performed. Analytical dependencies for simulation of a high-speed Electro-Optical Device for fire detection based on a spectral pyrometry method were formulated. The initial data for simulation about spectral characteristics of the test fires were taken from literature. Parameters of the photodetectors (PD-24-10 and PD-38) were taken from documentation on the photodetectors. The developed computer model allows simulating the operation of Electro-Optical Device in wide spectral ranges of 1200--4800 nm with wavelength step of 10 nm for test fires with temperature from 800 to 1600 K. Spectral ranges for detection of fire radiation by the Electro-Optical Device were studied. Six spectral ranges were determined during the study. The photodetectors of the Electro-Optical Device was selected. The set of spectral ranges was determined: $1800\pm 50nm;1900\pm 50nm;2000\pm 50nm; 3000 \pm 50nm;3400\pm 50nm;3550\pm$ 50nm. The maximum error of temperature calculation using this set of spectral ranges was 10%. Infrared photodetectors PD-19sr, PD-21sr, PD-29, PD34, PD-38 (manufactured by IoffeLED) were selected for the implementation of the Electro-Optical Device.

  • Simulation of High-Speed Electro-Optical Device for Fire Detection at Early Stage under the Influence of Dynamic Optical Noise
    2019 20th International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2019
    Co-Authors: Alexey Yu. Sidorenko, Nadezhda Yu. Tupikina, Sergey A. Lisakov, Evgeniy V. Sypin
    Abstract:

    The simulation of high-speed Electro-Optical Device for fire detection under the influence of dynamic optical interference on the entrance pupil is performed. The analysis of known approaches to providing noise immunity of the Device is performed: use of selected spectral ranges of control; the use of additional channels of the Device (hardware redundancy); the use of additional algorithms for signal processing channels of the Device (software redundancy). Analytical dependences for modeling are formulated. The simulation of the optoelectronic Device operation is performed. Calculation of the mathematical model was made using software package Matlab and the development environment RAD Studio. The characteristics of changes in spectral ratios depending on the temperature of the filament body are obtained. The spectral flux of the incandescent lamp is calculated from the dynamics of the temperature change of the incandescent body. As result of modeling, the spectral ranges of control -1350±50, 2700±50 and 4300±50 nm were selected, and their ratios were based. Ratios of Q2700-1350 for the spectral flow of a fire and incandescent bulbs made up 10.9 and 0.164 respectively. Ratios of Q2700-4300 hearth and bulbs amounted to 1.34 and 4.13, respectively. The values of the ratios established in the range for Q2700-1350 from 10.748 to 0.784 for Q2700-4300 from 1.354 to 1.557 for total flow with changes in temperature of the filament lamp. The characteristic values of the ratios changes characterizing the fire and the incandescent lamp and allowing to detect the radiation of the source against the background of optical interference are determined. Additional studies on the basis of the developed model should be carried out to more accurately identify the source of fire under the influence of dynamic optical interference.

  • Modeling of Concentration Electro-Optical Sensors for Gas and Coal Dust in Multi-Criterial Electro-Optical Device for Control of the Emergency and Pre-Emergency Situations in Coal Mines
    2018 19th International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2018
    Co-Authors: Sergey A. Lisakov, Anton I. Sidorenkc, Ivan S. Zorin, Evgeniy V. Sypin
    Abstract:

    Modeling of Electro-Optical sensors (EOS) for the concentration of methane, carbon monoxide, dioxide and coal dust was carried out. These sensors are part of a multicriteria Electro-Optical Device for monitoring emergency and pre-emergency situations in coal mines. The main analytical dependencies for the modeling of Electro-Optical sensors for the concentration of gases and dust have been determined. Computer model has been developed on the basis of this dependencies. The verification of the computer model adequacy is based on experimental data, which are given in the literature. The relative error in modeling the CO2sensor does not exceed 5%, CO -7%, C2H4 -4%. The relative error in modeling of the coal dust concentration sensor does not exceed 7%. Simulation of the spectral transfer coefficient of gases and dust-air mixture was carried out. The effect of cross-sensitivity for gas EOS and coal dust EOS for clarifying of control spectral ranges was analyzed based on simulation results. Methane concentration is controlled in the spectral range of 3.2-3.7 μm, carbon dioxide - in spectral range of 4.2-4.4 μm, carbon monoxide - in spectral range of 4.5-4.7 μm, The hardware (source and receiver of radiation) is selected for Electro-Optical sensors of the gases and dust concentration. Investigation of the foreign gases effect on the readings of the EOS, which controls the concentration of an individual gas (cross sensitivity) was carried out. Effect of extraneous gases on the EOS readings of the concentration of dust and gases has been determined.

  • High-speed Electro-Optical Device for determining of adulterated honey
    2016 17th International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2016
    Co-Authors: Kseniya A. Kovshova, Sergey A. Lisakov, Evgeniy V. Sypin
    Abstract:

    Article describes a method for determining the difference of adulterated and natural honey by spectral analysis. Features of the method are formulated. The technique of carrying out research, design of laboratory setup and the block diagram of a household appliance were developed. Spectral characteristics transmittance transmittances of the honey were received a result of an experimental study. Product was received from honey and sugar syrup by interfusion. The comparative analysis of the received spectral characteristics transmittance was carried out.

Lachezar Komitov - One of the best experts on this subject based on the ideXlab platform.

  • Short pitch cholesteric Electro-Optical Device stabilized by nonuniform polymer network
    Applied Physics Letters, 2005
    Co-Authors: Sang Hwa Kim, Liang-chy Chien, Lachezar Komitov
    Abstract:

    We have developed a method for stabilization of the uniform lying helix (ULH) texture of short pitch cholesterics in an Electro-Optical Device, based on the flexoelectro-optic effect in such a texture. By using a small concentration of photoreactive liquid crystalmonomer (less than 5 wt. % ) and selecting the illumination conditions, we were able to create a nonuniform polymeric network in the liquid crystal bulk (localized essentially at both substrate surfaces) which stabilized efficiently the amplitude and the phase modulation modes of the Device. Most importantly, the effect of the residual birefringence of the polymeric network in the field-unwound state of the Device was eliminated resulting thus in a substantial improvement of Device performance.

R. N. Faizutdinov - One of the best experts on this subject based on the ideXlab platform.

S. M. Chernyavskii - One of the best experts on this subject based on the ideXlab platform.