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 …

Focused laser differential interferometry (FLDI), first introduced in the 1970s, has developed
into a powerful tool for the analysis of turbulent dynamics and fluctuations in fluid flows …

Measurements of surface heat flux via IR thermography and boundary layer density
fluctuations using a variation of focused laser differential interferometry (FLDI) were …

FOCUSED-LASER differential interferometry (FLDI), first dis-cussed by Smeets and George
[1], allows for high-frequency (greater than1 MHz) nonintrusive flow disturbance …

While designed to suppress disturbances located away from its beam foci, focused laser
differential interferometry (FLDI) is known to have some integration of signals along its …

This work investigates a hypersonic turbulent boundary layer over a 7° half angle cone at a
wall-to-total temperature ratio of 0.1, M∞= 7.4 and R e∞ m= 4.2× 10 6 m− 1, in terms of …

An analytic methodology is presented to reconstruct the pressure waveform of flowfields with
circular symmetry from the phase shift detected with Focused Laser Differential …

View Video Presentation: https://doi. org/10.2514/6.2023-4253. vid Simultaneous density-
fluctuation measurements were made using a linear array focused laser differential …

This paper presents a computational study of double focused laser differential interferometry
(D-FLDI) measurements related to the second (Mack) mode instability. High-fidelity direct …

View Video Presentation: https://doi. org/10.2514/6.2023-0660. vid Quasi-random distributed
roughness topologies were produced to transition the boundary layer over an axisymmetric …