NASA Technical Reports Server (NTRS) 20030099653: Designing It Smart With SIV

1 Pages·0.02 MB·English

by  NASA Technical Reports Server (NTRS)

Designing It Smart With SIV
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hen research staff at NASA’s Glenn Research motion in the observation volume. Users obtain the 3-D I
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Center developed and patented Stereo data by computationally combining the 2-D information d
Imaging Velocimetry (SIV), the world’s first from both cameras. The SIVmethod incorporates a cam- u
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three-dimensional (3-D), full-field quantitative and qual- era-calibration technique in which rotation and transla- t
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itative analysis tool to investigate flow velocities, exper- tion of camera lenses and optical distortion generated i
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iments that were previously impossible became a reality. in the lenses are taken into account using the accurate l

Seizing the opportunity to commercialize NASA’s 2-D- to 3-D-mapping function. P
breakthrough invention, Digital Interface Systems (DIS), SIVapplies to diverse experiments such as the study ro
Inc., of North Olmsted, Ohio, acquired an exclusive of multiphase flow, bubble nucleation and migration, d
license to market SIV, which has a range of applications u
pool combustion, and crystal growth. The technique suc- c
from improving the aerodynamics of aircraft and auto- cessfully analyzed data from two Space Shuttle mis- t
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mobiles to avoiding “no flow” regions in artificial hearts. v
sions. Several of NASA’s ground-based experiments are
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NASA Glenn’s SIV is a safe, affordable means to t
also benefiting, as SIVis applied to the Agency’s micro- y
obtain 3-D flow information from any transparent liquid /
gravity program for fluid physics experiments. M
that can be seeded with tracer particles. Previously, accu-
In the commercial marketplace, SIVapplies to indus- a
rate information of this type was very difficult to obtain n
trial process optimization and the design of new prod-
and often required using dedicated laser-based measure- u
ucts. It helps companies to create more efficient heating, f
ment systems. Eliminating the need for lasers, SIVpro- a
ventilating, and air conditioning systems, as well as qui- c
vides an effectively nonintrusive measurement of 3-D t
eter airflow within auto heating and cooling ducts. The u
fluid velocities at many points and at high frame speeds
technology can assist with air flow studies around build- r
using two charge coupled device (CCD) video cameras i
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ings and the modeling of continuous casting operations.
and neural networked-based computational algorithms. g
SIV has been used in the steel industry to quantify the
It allows for the direct comparison of computed and T
continuous casting process, the vacuum cleaner industry e
experimentally measured fluid flows, with no limitation
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on the fluid flow scale to be measured. to observe brushroll designs, and in the sporting goods h
The five distinct steps in the SIV method include industry to investigate the bat-ball impact phenomenon n
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camera calibration, centroid/overlap decomposition, par- of softball bats. l
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ticle tracking, stereo matching, and 3-D analysis. The SIVis available through DIS as an on-demand World g
CCD cameras are oriented at 90º with respect to each Wide Web deployable program or as a mini-compact y
other in order to observe a fluid experiment that has been disc version, with robust, user-friendly, graphical user
seeded with the small tracer particles. Each camera interface enhancements that enable easy navigation of
records two-dimensional (2-D) data of the particles’ the tool.
This diagram shows a fluid experiment
seeded with tracer particles.Two cameras
are set up perpendicular to each other,
recording two widely disparate views.The
two views are computationally combined
to obtain three-dimensional coordinates of
the seed particles.
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