Investigation of Using Broadband Excitation and Detection in Evaluating Flowfield Temperatures and Pressures
A nonintrusive method to measure temperature and pressure utilizing cxbroadband excitation and detection of oxygen fluorescence is presented. The required finely-tuned laser excitation source is replaced by a more rugged and less bulky Xenon flashlamp. As a tradeoff, more lines are excited and hence more fluorescence lines need to be monitored. Using a numerical fluorescence model, temperature and pressure sensitive bins of varying sizes (5,10,15,20 nm) between 200 and 300 nm are determined. By scaling the bin values with a relatively pressure insensitive bin, a pressure insensitivity parameter was found that allowed the determination of the 5 nm bin centered about 222.5 nm to be the most temperature sensitive for the temperature range 200-1500 K.
KeywordsFluorescence Photon Xenon Flashlamp Lorentzian Lineshape Broadband Excitation Laser Excitation Source
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