Simultaneous Velocity Profile and Scalar Spectra with Linear Array-Focused Laser Differential Interferometry

Davenport, Kirk; Gragston, Mark

doi:10.2514/1.j061945

Cited by 9 publications

(1 citation statement)

References 19 publications

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“…Focused-laser differential interferometry (FLDI) has recently become a valuable optical measurement technique for diagnostics of high-speed transitional [1][2][3] and turbulent flows [4,5]. The technique, discussed in detail by several authors [6][7][8][9], provides measurements of the index of refraction changes which are spatially filtered across the beam path by the focusing aspect of the beams.…”

Section: Introductionmentioning

confidence: 99%

Multi-depth focused laser differential interferometer based on chromatic aberration

Webber,

Constantin,

Edwards

et al. 2024

Appl. Opt.

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A modified version of focused laser differential interferometry (FLDI) is demonstrated with adjacent beam pairs distributed along the optical axis. This feature is accomplished using two different wavelengths of light in the interferometer and accounting for the chromatic aberration of the lenses in the optical setup. It is demonstrated that ray trace calculations can be modified to predict the focal points of each of the two different colored beams, and experiments using a tube jet and a laser-induced blast wave show the instrument still has the expected features of an FLDI as well as continued capability for velocimetry. This modification is in effort to allow FLDI to be used for the analysis of three-dimensional flows, especially if combined with other multi-point variations and targeting high-frequency flow content.

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Section: Introductionmentioning

confidence: 99%

Multi-depth focused laser differential interferometer based on chromatic aberration

Webber,

Constantin,

Edwards

et al. 2024

Appl. Opt.

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Programmable focused laser differential interferometer with a spatial light modulator as a dynamic diffractive optical element

Holladay,

Zhang

2023

Opt. Lett.

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A spatial light modulator (SLM) is incorporated into a focused laser differential interferometer (FLDI) to generate a nonlinear array of beams, and this setup is used to measure the power spectral density of a Mach-1.5, underexpanded jet of air. The results are compared with measurements from a 1-point FLDI to assess the feasibility of using SLMs in FLDI to serve as dynamic diffractive elements for generating beam arrays of any shape. The spectra comparison illustrates that spatial light modulated-FLDI (SLM-FLDI) detects similar spectral profiles to that of 1-point FLDI, especially dominant frequencies in the jet. SLM-FLDI could provide a useful expansion of FLDI capabilities.

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3D-Printed Quasi-Random Distributed Roughness for Turbulent Boundary Layer Analysis on Hypersonic Ogive Nosecones

Shine

White

Bowersox

et al. 2023

AIAA SCITECH 2023 Forum

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Simultaneous Velocity Profile and Scalar Spectra with Linear Array-Focused Laser Differential Interferometry

Cited by 9 publications

References 19 publications

Multi-depth focused laser differential interferometer based on chromatic aberration

Multi-depth focused laser differential interferometer based on chromatic aberration

Programmable focused laser differential interferometer with a spatial light modulator as a dynamic diffractive optical element

3D-Printed Quasi-Random Distributed Roughness for Turbulent Boundary Layer Analysis on Hypersonic Ogive Nosecones

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