By Werner Jüptner, Thomas Kreis
Internationally well-known specialists within the box of holographic interferometric trying out, X-ray checking out, and structural research through finite point innovations have come jointly in ESPRIT undertaking 898 to improve a approach that integrates those options. the program acts as an exterior interface among the complementary nondestructive trying out equipment and laptop dependent structural research. within the e-book the checking out and research concepts are provided and in comparison with certain emphasis on difficulties concerning their mix and integration. The structure and the parts of the interface procedure are defined. Experiments proving the feasibility and applicability of the techniques are awarded. The chapters of the publication facing different options are written by means of the person companions of the undertaking. a standard try item is investigated via all innovations. The ebook is helping the client to choose the trying out and research process best suited for his challenge. It additionally offers the heritage for increase built-in trying out gear for research and control.
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Additional info for An External Interface for Processing 3-D Holographic and X-Ray Images
10. Fig. 10: Holographic arrangement for evaluation of tensile test specimen The four phase shifted holographic interferograms of the specimen's surfa- ce above the crack-tip are given in a combined display in evaluation along one line is shown Figs. 12d display the four intensity line. 12~ Fig. 11. The in subsequent stages in Fig. 12. distributions along this phase-shift a(n,m), pointwisely recalculated by Eq. 24), is given together with the straight horizontal line that corresponds to the average a.
The array corresponds to the array of pixel positions on a graphic screen, the maximum can and size ,to be considered for use in the stress analysis is 512 x 512. The manner by which the values are obtained is such that the range values ar- of be covered by the use of 16 bit integers, so that five decimal digits are sufficient to cover the range. It was necessary to transmit this data between different computers at ferent sites, dif- and a format was devised for representing the data in ASCII characters.
This theorem demands more than two pixels per interference long each xels has to be less than se is fringe a- line or colummn, thus the phase difference between adjacent pi- unwrapped by 1[". adding I f the di fference is greater than 1[", or subtracting integer multiples of this point on. Based on this, we define a procedure for phase the pha2~ from unwrapping 38 in two dimensions that first resolves the discontinuities along one arbit- rary, say the I-th colummn, and then, starting from this colummn, along the lines.