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Experimental Mechanics @
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Recent
Research: Fringe Projection |
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Fringe
projection is a derivative of projection moiré in which a grating is projected
onto the object of interest and an image acquired digitally. The shape of the object may be obtained by
comparing the image with one of a flat plane onto which the same grating is
projected, or the deformation by using images acquired before and after
loading. The examples above show shape
determination for face masks (left) and for a jet-engine fan blade with a
reflection coating on the lower half.
The example on the right illustrates the process, starting top left
and proceeding clockwise, is the reference grating projected onto a flat
plane, the face mask, the grating projected onto the face mask, the resultant
phase map produced when the images are interfered, the unwrapped map and a
three-dimensional representation of the unwrapped data. A novel algorithm has been developed based
on the five step phase-shifting process and quality guided unwrapping which
allows real-time tracking of shape change.
For for details see: HEREDIA-ORTIZ, M., PATTERSON, E.A., 2003, ‘On the industrial applications of moiré and
fringe projection techniques’, Strain, 39:1-6. And, or HEREDIA ORTIZ, M,
PATTERSON, E.A., 2005,
‘Location and shape measurement using a portable fringe projection system’, Experimental
Mechanics, 45(3):197-204, 2005. In-house software for processing fringe projection
data is available and a video (93Mb) showing its
application in the aerospace industry as part of the EU-funded in INDUCE
project can be downloaded. For more
information on this research project click here |
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