Recent progress in high-speed laser diagnostics for hypersonic flows
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 …
reviewed. Owing to the ultrahigh flow speed, a laser frequency of 100 kHz or higher is …
A multi-point focused laser differential interferometer for characterizing freestream disturbances in hypersonic wind tunnels
A three-point Focused Laser Differential Interferometer (FLDI) instrument was implemented
to investigate the freestream disturbance environment in a Mach-6 shock tunnel. The FLDI …
to investigate the freestream disturbance environment in a Mach-6 shock tunnel. The FLDI …
Interpreting single-point and two-point focused laser differential interferometry in a turbulent jet
AP Ceruzzi, CP Cadou - Experiments in Fluids, 2022 - Springer
Focused laser differential interferometry (FLDI) and its relative two-point FLDI (2pFLDI) are
used to make density fluctuation and velocity measurements, respectively, in a canonical …
used to make density fluctuation and velocity measurements, respectively, in a canonical …
Detection of second-mode instabilities on a flared cone in Mach 6 quiet flow with linear array focused laser differential interferometry
In this work, an enhanced version of the focused laser differential interferometer (FLDI) is
used to measure second-mode instabilities in the boundary layer on a flared cone in Mach 6 …
used to measure second-mode instabilities in the boundary layer on a flared cone in Mach 6 …
Focused Laser Differential Interferometry: Recent Developments and Applications for Flow Measurements
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 …
into a powerful tool for the analysis of turbulent dynamics and fluctuations in fluid flows …
Static and dynamic characterization of a focused laser differential interferometer
JM Lawson, MC Neet, IJ Grossman, JM Austin - Experiments in Fluids, 2020 - Springer
A focused laser differential interferometer (FLDI) is experimentally characterized via static
and dynamic benchtop testing. The static response is probed using a steady, laminar helium …
and dynamic benchtop testing. The static response is probed using a steady, laminar helium …
Multi-point line focused laser differential interferometer for high-speed flow fluctuation measurements
JM Weisberger, BF Bathel, GC Herring, GM Buck… - Applied Optics, 2020 - opg.optica.org
A multi-point focused laser differential interferometer (FLDI) has been developed to measure
density fluctuations at 16 points along a line. A pair of cylindrical lenses on the transmitter …
density fluctuations at 16 points along a line. A pair of cylindrical lenses on the transmitter …
Focused laser differential interferometric investigation of turbulent jet spectra
A Hameed, NJ Parziale - Journal of Spacecraft and Rockets, 2022 - arc.aiaa.org
In this work, a model of focused laser differential interferometry (FLDI) is derived by
incorporating the local intensity of each beam in an FLDI beam pair. We rederive some …
incorporating the local intensity of each beam in an FLDI beam pair. We rederive some …
Correlated off-body density fluctuations and surface heating in hypersonic boundary layer transition
Measurements of surface heat flux via IR thermography and boundary layer density
fluctuations using a variation of focused laser differential interferometry (FLDI) were …
fluctuations using a variation of focused laser differential interferometry (FLDI) were …
Recovering density disturbance spectra from FLDI. Part 1
JM Lawson, JM Austin - Applied Optics, 2023 - opg.optica.org
Focused laser differential interferometry (FLDI) measures the phase shift corresponding to
localized fluctuations in the refractive index of a medium. The sensitivity, bandwidth, and …
localized fluctuations in the refractive index of a medium. The sensitivity, bandwidth, and …