By Werner Jüptner, Thomas Kreis
Internationally famous specialists within the box of holographic interferometric trying out, X-ray checking out, and structural research through finite aspect ideas have come jointly in ESPRIT venture 898 to strengthen a process that integrates those suggestions. the program acts as an exterior interface among the complementary nondestructive trying out equipment and computing device dependent structural research. within the booklet the checking out and research recommendations are provided and in comparison with certain 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 recommendations are offered. The chapters of the publication facing the several innovations are written through the person companions of the undertaking. a typical try item is investigated by means of all recommendations. The e-book is helping the client to pick the checking out and research procedure most fitted for his challenge. It additionally offers the historical past for build up 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
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. But for properly known structures and for have calculation of loading types, another method the displacement field can be applied.
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. The accuracy of the fringe tracking methods is in the range of the wavelength of the laser light used.
JOPTNER: Automatisierte Auswertung holografischer Interferogramme mit dem Zeilen-Scan-Verfahren, DPG/DGaO - FrUhjahrsschule, Hannover (1978) /12/ W. JOPTNER, TH. KREIS, H. KREITLOW: Automatic evaluation of holographic interferograms by reference beam phase shifting, Proc. SPIE, vol. 398, 22 - 29 (1983) /13/ TH. KREIS, W. JOPTNER: Bestimmung von Bauteilfehlern durch ein kombiniertes Verfahren von holografischer Interferometrie und Finite-Elemente-Methode, VDI-Berichte Nr. 631, 139 - 151 (1987) /14/ M.
An External Interface for Processing 3-D Holographic and X-Ray Images by Werner Jüptner, Thomas Kreis