An External Interface for Processing 3-D Holographic and by Werner Jüptner, Thomas Kreis

By Werner Jüptner, Thomas Kreis

Internationally famous specialists within the box of holographic interferometric trying out, X-ray trying out, and structural research through finite aspect strategies have come jointly in ESPRIT venture 898 to advance a method that integrates those options. the program acts as an exterior interface among the complementary nondestructive checking out tools and laptop dependent structural research. within the publication the checking out and research options are provided and in comparison with unique emphasis on difficulties relating to their blend and integration. The structure and the elements of the interface procedure are defined. Experiments proving the feasibility and applicability of the thoughts are offered. The chapters of the ebook facing the various recommendations are written by means of the person companions of the undertaking. a typical try item is investigated by means of all concepts. The ebook is helping the buyer to choose the trying out and research approach most fitted for his challenge. It additionally provides the heritage for increase built-in checking out gear for research and control.

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5 Data Format for Representation of Holographic Images The result of the analysis of our object by holographic methods is ray of an values representing the displacements at points of the object. 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.

This was read by module a described later, which converts the image back to its original form and the derivatives for the image calculated. The size of this image is 64 x 64, and fig. 1 shows the the distribution of displacement and the second derivative with respect to y, which can be seen to vary as x 3 • fig. 2 shows the second and third respect to x, which vary as xy2 and y2, respectively. derivatives with 50 + Fig. 1: Function x 3y2 (below) and second derivative for y (above) 51 Fig. 2: Second (below) and third (above) derivative for x of function 3 2 x y 52 This is a simple, quick form of display which demonstrates that the diffe- rentiation module is calculating derivatives accurately, although some curacy has ac- been lost in producing a card image format with a limited num- ber of figures for transmission, and then scaling back to the original va- lues.

To demonstrate the capability of the Fourier-transform method, the holographic interference pattern of the thermally loaded composite panel as befo- re is evaluated. Fig. 16 shows the recorded and stored holographic reconstruction of the illuminated surface and Fig. 17 displays the same a temperature change and thus after the formation of interference fringes in real time. The Fourier transforms of both images are computed. Then the Fig. 16: Illuminated surface Fig. 17: Reconstructed holographic interference pattern 40 complex spectrum of the holographic interferogram, the amplitude spectrum of which is shown in Fig.

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