@inproceedings{dc1f5d51b2e4463daa8de4ab10b5899b,
title = "Expansion Tunnel Freestream Characterization Using Ultrafast Diagnostics",
abstract = "Femtosecond Laser Electronic Excitation Tagging (FLEET) and Coherent Anti-Stoke Raman Spectroscopy (CARS) were used to measure free stream flows in the Hypervelocity Expansion Tunnel (HXT) at Texas A&M University. Hypersonic flows of air and nitrogen with a Mach number of 8.5 and stagnation enthalpies ranging from 1.8 to 7.3 MJ/kg were probed. Despite short test times and flows with bright, broadband background emission, accurate FLEET velocity measurements were achieved. Theoretical computations of the HXT facility were validated using the measured FLEET velocities. In addition, CARS measurements targeting nitrogen were used to estimate the vibrational temperatures of free stream molecules. The CARS measurements revealed the presence of slight thermal non-equilibrium in the free stream flows.",
author = "Dean, {Tyler S.} and Pehrson, {John C.} and Bowersox, {Rodney D.W.} and Arthur Dogariu",
note = "Publisher Copyright: {\textcopyright} 2024 by Tyler Dean.; AIAA SciTech Forum and Exposition, 2024 ; Conference date: 08-01-2024 Through 12-01-2024",
year = "2024",
doi = "10.2514/6.2024-2833",
language = "English (US)",
isbn = "9781624107115",
series = "AIAA SciTech Forum and Exposition, 2024",
publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",
booktitle = "AIAA SciTech Forum and Exposition, 2024",
}