Abstract
Two-line atomic fluorescence (TLAF) is shown to be an accurate high-speed method of measuring spatially-resolved gas temperatures. Continuous-wave dye lasers are used to measure gas temperatures, with data acquisition rates of 5 kHz. Calculations are discussed which show that data rates up to 10 kHz are possible without significant increase in error. Near real time temperatures are obtained using a computer to perform the one-equation calculation. The standard deviation of the TLAF temperature measurements is found to be significantly less than that of temperatures measured with Rayleight scattering. TLAF temperatures are shown to closely follow thermocouple readings across a temperature range from 1700 to 2000 K in a steady laminar diffusion flame, and the extension of the technique to temperatures as low as 500 K is discussed. TLAF measurements in a turbulent flow field are reported which show a standard deviation of 125 K as compared to a nonturbulent level of 75 K.
Published Version
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