By Werner Jüptner, Thomas Kreis
Internationally well-known specialists within the box of holographic interferometric checking out, X-ray trying out, and structural research via finite point recommendations have come jointly in ESPRIT undertaking 898 to strengthen a process that integrates those options. the program acts as an exterior interface among the complementary nondestructive checking out tools and laptop established structural research. within the ebook the checking out and research suggestions are offered and in comparison with targeted emphasis on difficulties concerning their blend and integration. The structure and the parts of the interface method are defined. Experiments proving the feasibility and applicability of the options are awarded. The chapters of the e-book facing the various strategies are written via the person companions of the undertaking. a typical try item is investigated by way of all options. The publication is helping the buyer to pick the checking out and research technique most fitted for his challenge. It additionally offers the history for increase built-in trying 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
Soc. Am. A, vol. 3, 847 - 855 (1986) /17/ TH. KREIS: Fourier transform evaluation of holographic Proc. SPIE, vol. 814, 365 - 371 (1987) interference patterns, /18/ TH. KREIS: Auswertung holografischer Interferenzmuster mit Methoden der Ortsfrequenzanalyse, VDI-Fortschritt-Berichte, Reihe 8, Nr. 1 Analysis Methods Of currently available analysis methods, two stand out as being particularly relevant to this type of analysis, namely the finite element method and the boundary integral method. They both have the numerical model the important feature developed of a component is visually very similar to the object itself, thus permitting straight forward checking of integrity.
24), is given together with the straight horizontal line that corresponds to the average a. Figs. 3. 12g show the interference phase distributions modulo 2rr determined by Eqs. 25) and (3 . 26). l2h. Although a varying background intensity, ing contrast and vary- local saturation in the recorded intensities occur, the evaluated interference phase distribution is clean and smooth. The changes of slope, decreasing to increasing and vice versa, are uniquely detected . 31 Fig. 14) has to be inverted pointwise- ly.
Whilst verifying the data it is useful to obtain some measure of the variation of the displacements over the image, to assist in the discretisation of the object into finite elements. In the case of a solid object, such a as turbine blade, the solid finite elements to be used will allow a quadra- tic variation of displacements, so that provided an element is of reasonable shape, it will behave satisfactorily over a region where the second de- rivatives are constant, irrespective of their values.