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 …

Quantitative focused laser differential interferometry with hypersonic turbulent boundary layers

EK Benitez, MP Borg, J Luke Hill, MT Aultman… - Applied Optics, 2022 - opg.optica.org
The effect of turbulent wind-tunnel-wall<? TeX 2pc 0pt?> boundary layers on density change
measurements obtained with focused laser differential interferometry (FLDI) was studied …

Focused Laser Differential Interferometry: Recent Developments and Applications for Flow Measurements

EK Benitez, A Ceruzzi, M Gragston… - AIAA SCITECH 2025 …, 2025 - arc.aiaa.org
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 …

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 …

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 …

Measurements and analysis of hypersonic tripped boundary layer turbulence

KJ Hopkins, H Porat, TJ McIntyre, V Wheatley… - Experiments in …, 2021 - Springer
Surface roughness elements have been used to overcome the large prediction uncertainties
of hypersonic boundary layer transition. They provide the ability to force transition at short …

Recovering density disturbance spectra from FLDI. Part 2: comparisons with previous methods

JM Lawson, JM Austin - Applied Optics, 2023 - opg.optica.org
An exact analytical method for recovering density disturbance spectra in multi-frequency,
multi-dimensional fields from focused laser differential interferometry (FLDI) measurements …

Development of two-point focused laser differential interferometry for applications in high-speed wind tunnels

A Ceruzzi - 2022 - search.proquest.com
Focused laser differential interferometry (FLDI) and its relative two-point focused laser
differential interferometry (2pFLDI) are completely non-intrusive (ie seedless) optical …

Hypersonic oscillating shock-wave/boundary-layer interaction on a flat plate

GMD Currao, LP McQuellin, AJ Neely, SL Gai… - AIAA journal, 2021 - arc.aiaa.org
This work discusses the design, measurement, and simulation of an oscillating shock-
wave/boundary-layer interaction on a flat plate at Mach 5.8 and R e∞= 7× 10 6 m− 1. The …

Combined experimental and numerical investigation of a hypersonic turbulent boundary layer by means of FLDI and large-eddy simulations

GP Camillo, A Wagner, T Toki, C Scalo - Aerospace, 2023 - mdpi.com
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 …