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23 September 2005 Laser control of O2 and CO concentration in the boilers flue gas
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In this work is explored the effectiveness of application of various absorption laser spectroscopy methods for definition of gas components concentration in boilers' smoke gases. O2 and CO absorption spectrums are parsed, optimum absorption lines in near IR spectrum range (about 0.76 microns for O2 and 1.56 microns for CO) are selected and graphics of selected lines intensities and half-widths dependences on the temperature of controllable medium and pressure in it are given. Processes of monitoring of CO and O2 content in boilers smoke gases are simulated at usage of basic laser spectroscopy methods (integral, differential, modulation, correlation, modified correlation) and measurement inaccuracies are analyzed. It is ascertained, that for a decrease of methodical errors of concentration measuring it is necessary to take into account operated medium temperature and pressure. It is shown, that the least inaccuracies of CO and O2 concentration continuous monitoring at the presence of dissipative losses variations are ensured with the modified correlation method though its threshold sensitivity is less, than integral and correlation ones.
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Vladimir Firago, Waldemar Wójcik, Pawel Komada, and Ivan Manak "Laser control of O2 and CO concentration in the boilers flue gas", Proc. SPIE 5954, Optical Security Systems, 59540U (23 September 2005);

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