A sharp-focusing schlieren optical deflectometerA new instrument capable of localized, nonintrusive turbulence measurements is developed by combining a focusing schlieren system with an optical deflectometer. This instrument records the fluctuating light intensity at a point in the focused schlieren image. Its capability is verified by making benchmark measurements of Kelvin-Helmholtz vortices produced in a low-speed axisymmetric mixing layer. The sharp-focusing effect is demonstrated both visually and quantitatively. The results show that the instrument is capable of optical turbulence measurements within a 4 mm depth-of-field.
Document ID
19930040749
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Alvi, F. S. (NASA Langley Research Center Hampton, VA, United States)
Settles, G. S. (Pennsylvania State Univ. University Park, United States)
Weinstein, L. M. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 93-0629
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit