Digital Processing and Evaluation of Fringe Patterns in Optical Metrology and Non-Destructive Testing

  • W. Osten
Part of the International Centre for Mechanical Sciences book series (CISM, volume 403)


The basic principle of modern optical methods in experimental solid mechanics such as holographic interferometry, speckle metrology, fringe projection and moiré techniques consists either in a specific structuring of the illumination of the object by incoherent projection of fringe patterns onto the surface under test or by coherent superposition (interference) of light fields representing different states of the object. A common property of the methods is that they produce fringe pattern as output. In these intensity fluctuations the quantities of interest — coordinates, displacements, refractive index and others — are coded in the scale of the fringe period. Consequently the task to be solved in fringe analysis can be defined as the conversion of the fringe pattern into a continuous phase map taking into account the quasi sinusoidal character of the intensity distribution. The course starts with a physical modeling of the image content that contains the relevant disturbances in optical metrology. After that the main techniques for quantitative phase reconstruction together with the most commonly used image processing methods are presented. Because image processing is an important prerequisite for holographic non-destructive evaluation (HNDE) an overview of modern approaches in automatic flaw detection based on knowledge assisted and neural network techniques is given. Finally modern software tools for digital processing of fringe patterns are presented.


Fringe Pattern Digital Processing Speckle Noise Holographic Interferometry Phase Unwrap 


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Copyright information

© Springer-Verlag Wien 2000

Authors and Affiliations

  • W. Osten
    • 1
  1. 1.BIASBremenGermany

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