Smishnyi S. Means of measuring control of gas concentration on the basis of fiber optical measuring transformers

The object of research is the process of measuring control gas concentration by optical methods using fiber optic transformers, the purpose of the thesis is to improve measurement accuracy and the probability control gas concentration measurement by using the controls on the basis of fiber-optical measuring transformers, which work is based on optical absorption and differential methods; methods are based on a theory of radiation transfer in a medium with absorption, the theory of spectral absorption of IR radiation by gases, the theory of emission of electromagnetic waves in optical fibers and optical fiber elements, mathematical modeling, measurement theory, control and evaluation of metrological characteristics; theoretical results - mathematical model of measuring control of gas concentration which is based on the on method of optical absorption of radiation, is worked out which uses a small spectral ratio characteristical wavelength gas absorption with regard to the optical characteristics of quartz fiber-optic connecting lines and components; the recieved analytical expressions that take into account factors that affect the accuracy of measurement that allowed to do the compensation of absolute multiplicative and additive errors of pressure and temperature, as in fiber-optic elements and in the gas environment; based on the theoretical research the choice of the absorption spectra of gases in the atmosphere granted, which are organically combined with optical and energy characteristics of quartz fiber optic connecting lines. Practical results - circuit decisions of measurement of gas using fiber optics elements based on optical absorption and differential methods are developed; the conditions of operation of means of measuring based on fiber optic measuring transformers are cleared up, which designed to determine the composition and concentration of the gas, which allowed to get the correlation that can be used to calculate the proposed means of measuring control; the dependence of output voltage fiber optic measuring transformers on the concentration of methane is established; circuit decisions are proposed to improve the accuracy and sensitivity of optical means control of gas concentration; a means of measuring control of methane concentration is developed, where serves as the reference channel fiber optic; the algorithm of the proposed product is worked out. Degree of implementation - the results of the thesis are introduced in SPC "Advismash" (Khmelnytskyi) and the in learning process of the department of physics and methodology of teaching physics, computer science, astronomy of VSPU named after M. Kotsyubynskyi. Sphere (branch) use - chemical, fuel and energy, oil and gas industries; housing sector, monitoring of environment.