Corrections to Fringe Distortion Due to Flow Density Gradients in Optical Interferometry
Abstract
An analytical method is formulated to account for distortions of optical interferograms used for studies of flow over airfoils experiencing dynamic stall. It is shown that such distortions are generated primarily due to optical path deflections in the test flow, caused by large density gradients. Such in-flow optical path deflections are neglected in conventional optical techniques for flow studies. The present method employs a ray analysis to determine these in-flow optical path deflections, and accurately predicts the interferogram distortions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1993
- Accession Number
- ADA268650
Entities
People
- L. W. Carr
- M. S. Chandrasekhara
- Y. C. Cho
Organizations
- National Aeronautics and Space Administration