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Optical Engineering

Holographic Contouring Using Electronic Phase Measurement
Author(s): R. Thalmann; R. Dandliker
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Paper Abstract

The application of heterodyne and quasi-heterodyne (stepwise phase shifting) fringe interpolation techniques to contouring for 3-D object shape measurement is discussed. A setup with two spherical illumination sources for contour fringe generation is described. The contour fringe pattern can be observed in real time or from a holographic reconstruction. The use of a microcomputer for automated data acquisi-tion and processing allows one to determine the object shape for a large number of points and for arbitrarily shaped contour fringe surfaces. Experimental results are reported for both heterodyne and quasi-heterodyne phase measurement, offering a typical accuracy for object depth measurement of 0.2% of the lateral extension of the object.

Paper Details

Date Published: 1 December 1985
PDF: 6 pages
Opt. Eng. 24(6) 246930 doi: 10.1117/12.7973605
Published in: Optical Engineering Volume 24, Issue 6
Show Author Affiliations
R. Thalmann, Universite de Neuchatel (Switzerland)
R. Dandliker, Universite de Neuchatel (Switzerland)

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