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Computer-aided light sheet flow visualization using photogrammetryA computer-aided flow visualization process has been developed to analyze video images acquired from rotating and translating light sheet visualization systems. The computer process integrates a mathematical model for image reconstruction, advanced computer graphics concepts, and digital image processing to provide a quantitative and a visual analysis capability. The image reconstruction model, based on photogrammetry, uses knowledge of the camera and light sheet locations and orientations to project two-dimensional light sheet video images into three-dimensional space. A sophisticated computer visualization package, commonly used to analyze computational fluid dynamics (CFD) results, was chosen to interactively display the reconstructed light sheet images with the numerical surface geometry for the model or aircraft under study. The photogrammetric reconstruction technique and the image processing and computer graphics techniques and equipment are described. Results of the computer-aided process applied to both a wind tunnel translating light sheet experiment and an in-flight rotating light sheet experiment are presented. The capability to compare reconstructed experimental light sheet images with CFD solutions in the same graphics environment is also demonstrated.
Document ID
19950004447
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Stacy, Kathryn (NASA Langley Research Center Hampton, VA, United States)
Severance, Kurt (NASA Langley Research Center Hampton, VA, United States)
Childers, Brooks A. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1994
Subject Category
Computer Programming And Software
Report/Patent Number
NAS 1.60:3416
L-17291
NASA-TP-3416
Accession Number
95N10859
Funding Number(s)
PROJECT: RTOP 505-90-53-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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