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A new speckle-interferometric approach to measure the 3D-shape of discontinuous free-form surfaces

 
: Pfeifer, T.; Evertz, J.; Mischo, H.

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CIRP Annals. Manufacturing Technology 46 (1997), No.1, pp.501ff : Ill.
ISSN: 0007-8506
International Institution for Production Engineering Research (General Assembly) <47, 1997, Tianjin>
English
Conference Paper
Fraunhofer IPT ()
Meßtechnik; metrology; Optical Measuring; optical measuring instruments; optische Meßtechnik; optisches Meßsystem

Abstract
In Electronic Speckle Pattern Interferometry (ESPI) the introduction of so-called translation and muitiple-wavelength-techniques enable the user to collect data relating to a 3D-topography within a short space of time. While smooth surfaces may be measured using standard approaches, the investigation of shapes with discontinuities demands more advanced techniques. Various methods have been studied at the IPT. Our results demonstrate that by transfering the concept of Coded light Sectioning to an ESPI translation-technique in a generalised form, a wide variety of free forms, particularly those with large discontinuities can be measured with high levels of resolution and accuracy. The paper describes this new approach and presents various examples of current applications.

: http://publica.fraunhofer.de/documents/PX-26245.html