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Method and system for instantaneously determining the temperature of a low density gas using ensemble ratioing of laser-induced fluorescence peaks
Method and system for instantaneously determining the temperature of a low density gas using ensemble ratioing of laser-induced fluorescence peaks
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机译:使用激光诱导的荧光峰的总比例即时确定低密度气体温度的方法和系统
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摘要
A method and system are provided for determining temperature of a low density gas seeded with molecules of iodine. The Cordes bands of the iodine molecules are excited with light energy of a known wavelength (e.g., between 175-210 nanometers) to generate fluorescent emission. At least a portion of the emission's light intensity is collected and used to generate an emission spectrograph. The spectrograph's vibrational energy level peaks are fitted to a vibrational Boltzmann distribution. Specifically, one of the vibrational energy level peaks associated with molecule population in a ground vibrational energy level at a wavelength greater than the known wavelength of the light energy is selected. Next, a plurality of ratios are generated that define a unique linear relationship for a temperature of the seeded environment. Each of these ratios is defined by a ratio of the selected one of the vibrational energy level peaks (in a ground vibrational energy level) to another unique peak (of the vibrational energy level peaks) associated with molecule population in a vibrational energy level that is greater than the ground vibrational energy level.
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