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

摘要

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.