last update 1/18/2000


3-dimensional surface and deflection measurement using
interferometric light or stripe light projection.
Phase Shift Technique, Pseudo Phase Shift, Fourier Technique,
Moiré Technique, Gray Code Sequence, Projected Grid Method,
Correlation and Triangulation Techniques.
Information on many interferometric methods can be downloaded here:
Example for Fourier Technique:
   Projected stripes on flat plate with defects
  Phase image (modulo 2*PI) after assymmetric high pass filtering
   "BIAS" image, i.e. the 2*PI steps after unwrapping the phase image
  Surface elevation coded in gray levels by superimposing phase image and "BIAS" image
   Reconstructed 3-dimensional surface

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