Corrections to fringe distortion due to flow density gradients in optical interferometryAn 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 ID
19930040751
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cho, Y. C. (NASA Ames Research Center Moffett Field, CA, United States)
Carr, L. W. (U.S. Army, Aeroflightdynamics Directorate; NASA, Ames Research Center Moffett Field, CA, United States)
Chandrasekhara, M. S. (U.S. Naval Postgraduate School Monterey, CA, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 93-0631AD-A268650
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit