Determination of Absorption Coefficients in Shock Heated Propellant Mixtures for Laser-Heated Rocket Thrusters,
PHYSICAL SCIENCES INC ANDOVER MA
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A series of shock tube experiments were performed to determine the temperature dependence of the absorption coefficient of water vapor at high temperatures on the P16, P18, and P20 10.6 microns CO2 laser transitions. Measurements were made behind both incident and reflected shock waves encompassing a temperature range form 600 K to 3700 K at pressure from 1 to 40 atmospheres in 2, 5, and 10 mole percent water vapor in argon gas mixtures a limited number of runs were conducted using 10 mole percent mixtures of water vapor in hydrogen or nitrogen. Conditions at several temperatures were sufficiently varied to investigate the effects of broadening on the absorption coefficient. Within the narrow spectral range from 944 to 948cm covered in the measurements, no significiant variation in the absorption coefficient was observed as a function of laser wavelength, water concentration, total pressure, or collision partner.