Absorption measurements of H2O at high temperatures using a CO laser |
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| Authors: | S. Salimian R.K. Hanson |
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| Affiliation: | Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, U.S.A. |
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| Abstract: | Absorption of CO laser radiation (v = 8→7, J = 14→15 transition at 1901.762 cm-1) by H2O has been studied in shock-heated H2/O2/Ar mixtures over the temperature range 1300–2300 K. This laser transition is nearly coincident with the v2-band 123,10←112,9 transition of H2O at 1901.760 cm-1, thereby providing a convenient and sensitive absorption-based H2O diagnostic useful for studies of combustion. The collision-broadening parameter for this H2O line, due to broadening by Ar, was determined to be 2γ (cm-1atm-1) = 0.027 (T/1300)-0.9 in the temperature range 1300–2300 K. Calculations of the H2O absorption coefficient (at 1901.762 cm-1) based on this expression for 2γ are presented for the temperature range 300–2500 K and pressure range 0.3–1 atm. |
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