National Physical Laboratory

Fringe Projection and Photogrammetry

NPL has three fringe projection systems for the measurement of components and FreeForm surfaces.

This non-contact method optical technique provides rapid acquisition of dimensions. White light fringes are projected onto a 3-D object. These data are then translated into a 3-D point cloud, which can be interpreted through several commercially available software packages. Several point clouds can be stitched together giving the overall shape of the object. The accuracy of the technique, depends on the surface finish and size of the object, though is generally at the tens of micrometre level. Large artefacts may be measured by incorporating photogrammetry into the fringe projection technique.


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Last Updated: 2 Aug 2010
Created: 2 Aug 2010


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