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 …

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 …

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 …

Focused laser differential interferometry with contoured tunnel windows

EK Benitez, JS Jewell, SP Schneider - AIAA Journal, 2021 - arc.aiaa.org
A unique focused laser differential interferometry (FLDI) configuration designed to work with
contoured windows was developed for use with the Boeing/US Air Force Office of Scientific …

Optical-axis spatial sensitivity of a simulated focused laser differential interferometer

EK Benitez, MP Borg, C Rhodes, JS Jewell - AIAA Journal, 2023 - arc.aiaa.org
A focused laser differential interferometer (FLDI) simulation was used to study the sensitivity
of the FLDI technique to a variety of factors. The model takes in a series of density fields and …

Focused laser differential interferometry for hypersonic flow instability measurements with contoured tunnel windows

EK Benitez, JS Jewell, SP Schneider - AIAA Scitech 2020 Forum, 2020 - arc.aiaa.org
A focused laser differential interferometer (FLDI) was developed for use with the
Boeing/AFOSR Mach 6 Quiet Tunnel (BAM6QT) at Purdue University. To test the initial FLDI …

Hypersonic transitional boundary-layer profile using a linear-array FLDI

EK Benitez, TJ Leger, MW Tufts, MP Borg… - AIAA Aviation 2023 …, 2023 - arc.aiaa.org
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 …

Linear array photodiode and data acquisition system development for multi-point line FLDI measurements

JM Weisberger, BF Bathel, JW Lee… - AIAA Scitech 2022 …, 2022 - arc.aiaa.org
View Video Presentation: https://doi. org/10.2514/6.2022-1796. vid The continuous
development and advancement of multi-point line focused laser differential interferometry …

Simulated Focused Laser Differential Interferometry of the Hypersonic Second-Mode Instability

EK Benitez, MP Borg, SD Dungan, C Brehm… - AIAA SciTech 2025 …, 2025 - arc.aiaa.org
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 …