By Werner Jüptner, Thomas Kreis
Internationally well-known specialists within the box of holographic interferometric checking out, X-ray trying out, and structural research by way of finite point thoughts have come jointly in ESPRIT undertaking 898 to advance a method that integrates those suggestions. the program acts as an exterior interface among the complementary nondestructive trying out tools and desktop dependent structural research. within the publication the checking out and research recommendations are awarded and in comparison with unique emphasis on difficulties relating to their mixture and integration. The structure and the elements of the interface approach are defined. Experiments proving the feasibility and applicability of the suggestions are awarded. The chapters of the publication facing the various options are written through the person companions of the undertaking. a standard attempt item is investigated by way of all ideas. The booklet is helping the buyer to choose the trying out and research approach best suited for his challenge. It additionally provides the heritage for increase built-in checking out apparatus for research and control.
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Additional resources for An External Interface for Processing 3-D Holographic and X-Ray Images
When using the phase step method in conjunction phy, several During referen- reconstruction with both reference waves together one of 25 the reference waves is shifted in its phase resulting in a shift of the reconstructed macroscopic interference pattern. When using the real-time technique, clearly the wave field reflected from the object remains fixed, so it suffices wave that is used to shift the single reference for reconstructing the second of the interfering wave fields /13,15/. Having reconstructed, recorded, and stored several phase-shifted distributions, at each point a non-linear system of equations has to be solved.
The fringe tracking methods for determination of the from the former manual fringe counting methods. The xima originate L1~-field local brightness ma- or minima of the fringes are searched for by algorithms based on line tracking, on threshold comparison, or on adaptive binarisation quent and subse- thinning to perform a skeletonising /7/. The detected fringe extrema correspond to interference phase values that are integer multiples of 2~, thus there remains the problem of interpolating between the loci of the extrema.
L0r! llll or! l or! I Heterodyne Fringe Tracking Methods for Interference Phase Determination X cV- Z C 0 or! lH or! l or! J::: +J OJ or! S Ul or! l OJ C S OJ or! S H OJ OJ H 0, or! l or! 0) I\J 27 This evaluation gave a unique result: To fulfil external the requirements of the interface system, the phase step method and the Fourier transform method are best suited. These methods have consequently theoretically, the been investigated software for their realisation has been implemented in the demonstration system, practical experiments have been carried out, hardware concepts for and design of an interface system performing these me- thods have been developed.