High-temperature spectrally resolved NO laser-induced fluorescence for temperature and pressure measurement using a rapidly tunable UV laser

Spatially resolved, quantitative laser diagnostics are needed to understand high-temperature and high-speed flow fields. To that end, a spectrally resolved laser-induced fluorescence diagnostic targeting nitric oxide (in bath gases of Ar and N 2 ) was developed and validated in a series of static cell and shock tube experiments. Also, a spectrally resolved fluorescence model was created to simulate the underlying processes of diatomic spectrally resolved fluorescence and quantify the maximum theoretical measurement rate under various conditions. The diagnostic was validated from 295–1350 K and 2.1–47.0 kPa, and validation experiments showed good agreement with known values—a 3.0% and 5.5% average error in temperature and pressure (for collisional-to-Doppler width ratios greater than 0.30), respectively.