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Final rept. 4 Mar 93-28 Feb 97,
NOTRE DAME UNIV IN DEPT OF AEROSPACE AND MECHANICAL ENGINEERING
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This report describes fluid optic interaction research at the University of Notre Dame. This research has been extremely productive in both developing a new, high bandwidth 100 KHz, time resolved wavefront sensor and in terms of producing new information about the nature of the effect on an optical signals wavefront of propagation through a turbulent, optically active flow field. During the course of the research, a numerical point vortex method for simulating shear flows was developed and played a crucial role in developing the new wavefront sensor and interpreting the results of wavefront time series obtained by using the sensor to investigate optical propagation through low speed jets and high speed shear layers. Wavefronts were collected for propagation through a two dimensional heated jet the heated jet facility was developed specifically for this research. The spatial and temporal frequency content of these wavefronts was extensively analyzed leading to a new understanding of the nature of Aero-Optical phenomena. Further, the heated jet wavefronts were used to study the problems involved in attempting to correct Aero-Optically distorted wavefronts using adaptive optic techniques. The new sensor was also used to collect optical wavefronts due to propagation through a Mach 0.8 compressible shear layer similar to those that are encountered in aircraft flight conditions.
APPROVED FOR PUBLIC RELEASE