Recent advances in aero-optics

Jumper, Eric J.; Fitzgerald, Edward

doi:10.1016/s0376-0421(01)00008-2

Cited by 304 publications

(171 citation statements)

References 86 publications

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“…A simplified form of the resulting 'linking equation' from [1] relating turbulence quantities and levels of optical distortions is given as ( ) …”

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

“…where OPD rms is the root-mean-square of the OPD, ρ rms (y) is the root-mean-square density fluctuation profile along the beam direction, and Λ ρ (y) is the density correlation length [1]. Utilizing the assumption set forth by Malley, et al [6] that as turbulent structures convect their corresponding wavefront aberrations convect with them, Jumper and Fitzgerald [1] showed that Sutton's 'linking equation' result is equivalent to the formulation put forth in [3].…”

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

“…Utilizing the assumption set forth by Malley, et al [6] that as turbulent structures convect their corresponding wavefront aberrations convect with them, Jumper and Fitzgerald [1] showed that Sutton's 'linking equation' result is equivalent to the formulation put forth in [3]. Recent CFD studies of the aero-optics of TBL by Wang & Wang, where wavefront aberrations were computed by integrating through the computed density field, have also shown good agreement predictions from the linking equation [7].…”

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

“…Small disturbances to optical wavefronts in the near-field can result in significant reductions in time-averaged and instantaneous on-target intensity at points very far away from the source aircraft [1,2]. A reduction in on-target intensity poses a significant problem for the performance of airborne optical systems in directed energy, imaging, and free-space communications applications.…”

Section: Introductionmentioning

confidence: 99%

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Subsonic Boundary-Layer Wavefront Spectra for a Range of Reynolds Numbers

Smith

Gordeyev

Saxton-Fox

et al. 2014

45th AIAA Plasmadynamics and Lasers Conference

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Aero-optic measurements of turbulent boundary layers were performed in wind tunnels at the University of Notre Dame and California Institute of Technology for heated walls at a range of Reynolds numbers. Temporally resolved measurements of wavefronts were collected at a range of Mach numbers between 0.03 and 0.4 and the range of Re θ between 1,700 and 20,000. Wavefront spectra for both heated and un-heated walls were extracted and compared to demonstrate that wall heating does not noticeably alter the shape of wavefront spectra in the boundary layer. The effect of Reynolds number on the normalized spectra was also presented, and an empirical spectral model was modified to account for Reynolds number dependence. Measurements of OPD rms for heated walls were shown to be consistent with results from prior experiments, and a method of estimating OPD rms and other boundary layer statistics from wavefront measurements of heated-wall boundary layers was demonstrated and discussed.

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“…A simplified form of the resulting 'linking equation' from [1] relating turbulence quantities and levels of optical distortions is given as ( ) …”

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

Section: Opl X Y T N X Y Z T Dz K X Y Z T Dzmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Subsonic Boundary-Layer Wavefront Spectra for a Range of Reynolds Numbers

Smith

Gordeyev

Saxton-Fox

et al. 2014

45th AIAA Plasmadynamics and Lasers Conference

View full text Add to dashboard Cite

show abstract

“…These vortical structures are shown to create low-pressure drops to balance the centrifugal forces and, consequently create regions of lower density and index of refraction inside of the structures 2 . From an aero-optical point of view, these high-frequency aberrations are very destructive to a laser beam passing through the shear layer, leading to dispersing of the laser beam energy away from a target 3,4 . These structures impose a great challenge on the adaptive optics corrections because of their high levels of optical aberrations and corresponding high frequency bandwidths (Ref.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Optical Distortions of Two-Dimensional Shear Layer Using Large Structure Model (LSM)

Gordeyev

Jumper

Trolinger

2006

44th AIAA Aerospace Sciences Meeting and Exhibit

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A simple weakly compressible discrete vortex Large Structure Model (LSM) to predict dynamic evolution of the subsonic compressible two-dimensional shear layer is presented. It was shown that LSM code correctly predicts the shear layer growth rate and structure evolution, as well as spectral content and amplitude of optical distortions imposed by the shear layer on the passing laser beam. Due to small number of vortices required to represent the shear layer dynamics, computational times are very short. Also, the model was successfully extended to predict optical aberrations in flows over rectangular cavities. This model was developed as an engineering tool to quickly estimate dynamical optical distortions from shear layers.

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2022

Aero‐Optical Effects

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Recent advances in aero-optics

Cited by 304 publications

References 86 publications

Subsonic Boundary-Layer Wavefront Spectra for a Range of Reynolds Numbers

Subsonic Boundary-Layer Wavefront Spectra for a Range of Reynolds Numbers

Simulation of Optical Distortions of Two-Dimensional Shear Layer Using Large Structure Model (LSM)

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