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Aero-optics research at the Phillips Laboratory

Analysis of data from direct numerical simulation of turbulent shear flows has shown the importance of large-scale, coherent turbulent structure on optical propagation. A basic approach is taken that incorporates both an experimental and a computational effort to develop a fundamental understanding of fluid-optical interactions. A flow generator and diagnostic instrumentation have been designed and are being built to measure the effect that a `simple' canonical turbulent flow has on a transmitted beam. This `simple' flow retains the essence of actual cases of interest, determining the effect of turbulent flow on optical transmission, and yet is tractable. The diagnostics include standard sensors to characterize the flow and optical diagnostics, including tomography, to characterize both the flow and the effect of the flow on beam propagation. A new dynamical system model for passive-scalar transport in a turbulent flow is also being developed to guide the experimental effort and to provide insight on the fluid-optical interactions.