Abstract
Experimental data are presented of time-resolved optical wavefront measurements through a two-dimensional, weakly compressible, subsonic shear layer. The measurements were obtained in the University of Notre Dame's compressible shear layer wind tunnel (CSWLT), which is capable of generating high-speed shear-layer flows up to Mach 1.0 that can also be regularized using mechanical forcing applied at the trailing edge of the splitter plate between the high and low-speed flows. Experimental data are also presented demonstrating the use of a Phase-Lock-Loop (PLL) controller to detect and lock on to the phase of the shear-layer optical aberration; this kind of PLL control would be used to synchronize a deformable mirror with the shear-layer aberration, as part of a feedforward adaptive-optic correction for the optical effect of the shear layer.
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