Development of a HCl laser absorption diagnostic near 3.3 μm for shock-tube chemical kinetics studies.
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| Title: | Development of a HCl laser absorption diagnostic near 3.3 μm for shock-tube chemical kinetics studies. |
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| Authors: | Grégoire, Claire M.1 (AUTHOR) claire.gregoire@tamu.edu, Petersen, Eric L.1 (AUTHOR) |
| Source: | Applied Physics B: Lasers & Optics. May2025, Vol. 131 Issue 5, p1-14. 14p. |
| Subjects: | Shock tubes, Absorption coefficients, Shock waves, Chemical kinetics, Hydrogen chloride |
| Abstract: | A new hydrogen chloride (HCl) laser absorption diagnostic was developed and combined with a shock tube to obtain HCl time-history profiles behind reflected shock waves. An interband cascade laser was used to access the R(8) transition lines of the two isotopes H35Cl and H37Cl in the fundamental (1 ← 0) band at the specific wavelengths of 3045.06 and 3042.74 cm−1 near 3.3 μm, respectively. Spectroscopic parameters were obtained using HCl in 99.5% Ar, focusing on the line strengths and Ar-broadening effects, and were compared with theory from the literature. Experimental calibration of the HCl absorption coefficient and its dependence over a wide range of temperatures and pressures were obtained (i.e. 1261—1759 K, 0.25—0.42 atm, and 2390—3736 K, 1.26—2.00 atm). Measurements of the line strengths, Ar-broadening parameters at 296 K, and temperature-dependence exponents for the R(8) transition lines of H35Cl and H37Cl were validated against these results and can be summarized as follows: For H35Cl: S 12 T 0 = 2.099 ± 0.084 cm−2-atm−1, γ H 35 C l - A r T 0 = 0.0110 ± 0.0005 cm−1-atm−1, and n H 35 C l - A r = 0.4 ± 0.01. For H37Cl: S 12 T 0 = 0.708 ± 0.028 cm−2-atm−1, γ H 37 C l - A r T 0 = 0.0105 ± 0.0005 cm−1-atm−1, and n H 37 C l - A r = 0.3 ± 0.01. The new HCl laser probe shows promising results for future measurements to better understand the combustion chemistry of propellants containing chlorine. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | A new hydrogen chloride (HCl) laser absorption diagnostic was developed and combined with a shock tube to obtain HCl time-history profiles behind reflected shock waves. An interband cascade laser was used to access the R(8) transition lines of the two isotopes H35Cl and H37Cl in the fundamental (1 ← 0) band at the specific wavelengths of 3045.06 and 3042.74 cm−1 near 3.3 μm, respectively. Spectroscopic parameters were obtained using HCl in 99.5% Ar, focusing on the line strengths and Ar-broadening effects, and were compared with theory from the literature. Experimental calibration of the HCl absorption coefficient and its dependence over a wide range of temperatures and pressures were obtained (i.e. 1261—1759 K, 0.25—0.42 atm, and 2390—3736 K, 1.26—2.00 atm). Measurements of the line strengths, Ar-broadening parameters at 296 K, and temperature-dependence exponents for the R(8) transition lines of H35Cl and H37Cl were validated against these results and can be summarized as follows: For H35Cl: S 12 T 0 = 2.099 ± 0.084 cm−2-atm−1, γ H 35 C l - A r T 0 = 0.0110 ± 0.0005 cm−1-atm−1, and n H 35 C l - A r = 0.4 ± 0.01. For H37Cl: S 12 T 0 = 0.708 ± 0.028 cm−2-atm−1, γ H 37 C l - A r T 0 = 0.0105 ± 0.0005 cm−1-atm−1, and n H 37 C l - A r = 0.3 ± 0.01. The new HCl laser probe shows promising results for future measurements to better understand the combustion chemistry of propellants containing chlorine. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09462171 |
| DOI: | 10.1007/s00340-025-08458-3 |
