Accuracy in determination of the temperature and partial pressure of CO2 in CO2:N2:H2O:NO2 mixtures by multiple-frequency laser probing

Abstract

We present the results of analysis of the errors introduced by hot-band transitions 11 1 0-01 1 1, 03 1 0-01 1 1, 12 0 0-12 0 1 of the CO 2 molecule and the absorption lines of the H 2 O and NO 2 molecules in determination of the temperature and partial pressure of CO 2 , included in the gas mixture CO 2 :N 2 :H 2 O:NO 2 at atmospheric pressure, by multiple-frequency laser probing using a CO 2 laser tunable over the lines of the 00 0 1-[10 0 0,02 0 0] I,II ground-state laser transitions.

Multifrequency laser diagnostics of vibrational nonequilibrium gas media containing CO2 molecules

“…The developed technique for multifrequency diag nostics of vibrational nonequilibrium gas mixture con taining CO2 molecules was also applied to the analysis of actual experimental data, i.e., results of measure ments of unsaturated gains in the active medium of a transversely excited CO2 laser at a pressure of 80 Torr at lines of Pand R-branches of primary laser transi tions 0001-[1000, 0200]I,II and transitions of the first sequential band 0002-[1001, 0201]I,II [22]. From the data presented in [22], the 10P(12), 10P(20), 9P(18), 9P (22), 9R(10), 9R(12), 9R (18), and 9R(24) lines of the 0001-[1000, 0200]I,II transitions and 10P(15), 10P(25), 10R(31), and 9R(17) lines of the 0002-[1001,0201]I,II transitions with measured abnormal gains were excluded, as well as 10P( 14), 10P (18), 10P(28), 10P(34), 9P (10), 9R (14), 9R(30), and 9R(32) lines of the 0001-[1000,0200]I,II transitions, which are overlapped with lines of hot 1110-0111, 0310-0111 transitions (see, e.g., [13]). We have calcu lated the translational temperature of the active medium and populations of laser vibrational levels 0001, 1000, 0200, 0002, 1001, and 0201: T =(366.8±0.…”

“…The diagnostics of vibrational nonequilibrium gas media is performed by different methods, having dif ferent capabilities and application conditions (see, e.g., [9,10]). The method of laser spectrograph with the use of a frequency-stabilized tunable CO2 laser as a source of sensing radiation is the most adequate and convenient for diagnostics of both equilibrium and nonequilibrium gas media containing CO2 molecules [11][12][13][14].…”

Calculation of the Absorption Cross Sections of Some Molecules from GEISA Database at the Wavelengths of Isotopically Different CO2 Lasers

“…This information may be useful mainly in the differential absorption (Light Detection and Ranging) LIDAR technique for remote measurement of the gas species [1][2][3][4][5][6][7][8] and also may be used to monitor the CO 2 content in fuel combustion products [9], remote sensing of gases in human breath [10], or multiphoton dissociation processes or to measure water vapor concentration and wind speed vector in the plume of volcano [11,12]. Note that the LIDAR technique sometimes is used for remote sensing of some exotic gases, like, for example, chemical warfare [13].…”

Study of the parameters of the collisionally broadened R22 absorption line of the 1000-0001 transition in CO2 molecules: I. Experiment

“…The use of optical methods for diagnosing atmo sphere and heated gaseous products of fuel burning in order to determine the concentration of CO 2 mole cules and their temperature, as well as calculation of CO 2 laser characteristics, require knowledge of the spectroscopic parameters for the corresponding lines of the CO 2 molecule and their temperature depen dences (see, for example, [2][3][4][5][6]). Therefore, the CO 2 molecule has been an object of various studies aimed at determining these parameters for a long time.…”