Long-lasting emission from femtosecond excitation of nitrogen-based flows shows promise
as a useful mechanism for a molecular tagging velocimetry instrument. The technique …

The recent progress in high-speed (≥ 100k H z) laser diagnostics for hypersonic flows is
reviewed. Owing to the ultrahigh flow speed, a laser frequency of 100 kHz or higher is …

In the present work, a non-intrusive diagnostic technique known as molecular tagging
velocimetry was used to collect quantitative freestream velocity measurements in the Mach 7 …

Krypton Tagging Velocimetry (KTV) and Picosecond Laser Electronic Excitation Tagging
(PLEET) velocimetry at a 100-kHz rate were demonstrated in Mach 18 flow conditions at the …

Femtosecond laser electronic excitation tagging (FLEET) velocimetry was used in the
boundary layer of an ogive-cylinder model in a Mach-6 Ludwieg tube. One-dimensional …

The characterization of a hypersonic impulse facility is performed using a variety of methods
including Pitot probe scans, particle image velocimetry, and schlieren imaging to verify …

Unsteady surface pressure measurements have been carried out on a flat-plate test article in
the Air Force Research Laboratory's Mach-6 Ludwieg Tube at a negative angle of attack …

View Video Presentation: https://doi. org/10.2514/6.2023-2438. vid A self-aligned focusing
schlieren (SAFS) apparatus based on a recently published design is implemented for the …

In this work, 10 kHz molecular tagging velocimetry (MTV) in a M∞= 4 Ludwieg tube is done
using a partial pressure of acetone seeded into the facility driver tube. Despite using air as …

A 100 kHz krypton (Kr) tagging velocimetry (KTV) technique was demonstrated in a Mach-6
Ludwieg tube using a burst-mode laser-pumped optical parametric oscillator system. The …