A nonintrusive method to measure temperature and pressure utilizing broadband excitation with broadband detection (BE-BD) of oxygen fluorescence was investigated. The required finely-tuned laser excitation source for laser-induced fluorescence was replaced by a more rugged and less expensive xenon flashlamp where more lines are excited and more lines need to be monitored. A numerical model simulating photon absorption and emission of oxygen was developed to determine temperature and pressure sensitive fluorescence spectral regions. The spectral regions were located within a segment (200–300 nm) of the Schumann-Runge band. The two spectral bands selected were 5-nm wide and centered at 227.5 nm and 297.5 nm. These bins were monitored in a laboratory experiment and used to form a ratio to determine temperature. The resulting fluorescence ratio followed numerical predictions for temperatures between 80–170°C and pressures between 1 and 2 atm.

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