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- W2087203784 abstract "Optical aberrations induced by turbulent flows are critical issues for the performance of an airborne optical system. Inthat context experiments were performed on a test-body at Mach 3.7 with several high Reynolds number in the S3MAwind tunnel of ONERA. A Shack-Hartman wave front sensing was performed (see companion paper of R. Deron).The objective of this work was to develop a computational algorithm to model the wave front distortions in temporalaveraged field.First the aerodynamical flow field is obtained by RANS computation around the test body and mass-density isinterpolated in an optical grid. Then wave front has been calculated using ray tracing from eikonal equations. For thisvalidation two Reynolds numbers were retained and the boundary layer is turbulent on downstream window. A planaroptical beam is emitted from the window and passes through the inhomogeneous media from the boundary layer to theshock wave. Various pupil, angle positions and lines of sight are considered. Zernike decomposition and MTFcomputation allow modal analysis in the near field condition and evaluation of the image quality respectively. Tilt effectsappear to be the dominant aberration while higher orders have a limited impact on the image quality, except for largedepartures from the normal of the window. Discrepancies observed according to the line of sight variation are analysed.Finally simulations results compare favorably with the measurements made with the Shack-Hartmann wave frontsensing. So this computational study is conforted and allows to complete the experiment." @default.
- W2087203784 created "2016-06-24" @default.
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- W2087203784 date "2008-10-02" @default.
- W2087203784 modified "2023-09-26" @default.
- W2087203784 title "Numerical study of the wavefront distortion in an aerodynamical flow field" @default.
- W2087203784 doi "https://doi.org/10.1117/12.802773" @default.
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