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 ideas have come jointly in ESPRIT undertaking 898 to improve a approach that integrates those concepts. the program acts as an exterior interface among the complementary nondestructive trying out tools and desktop established structural research. within the publication the checking out and research concepts are provided and in comparison with distinct emphasis on difficulties concerning their blend and integration. The structure and the elements of the interface procedure are defined. Experiments proving the feasibility and applicability of the innovations are offered. The chapters of the publication facing different recommendations are written by way of the person companions of the undertaking. a typical try item is investigated via all suggestions. The e-book is helping the buyer to choose the trying out and research procedure best suited for his challenge. It additionally offers the historical past for increase built-in checking out apparatus for research and control.
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Extra info for An External Interface for Processing 3-D Holographic and X-Ray Images
7 Analysis of Honeycomb Panel The object chosen for investigation by all partners was of a composite nel, consisting of pa- surface layers of carbon-fibre reinforced plastic and an internal structure of an aluminium honeycomb. This structure and its material properties was supplied by IRAM. The structure was thermally loaded by BIAS and an image file corresponding to the normal displacement of one of the surface layers was transmitted for analysis by the finite element program MELINA: The first action was to read this file and convert back to its origin form, to record the surface normal displacements.
Especially for widely spaced interfe- rence fringes and in the presence of speckle noise and varying background illumination these methods cannot reach a good accuracy. In heterodyne holographic interferometry, the optical frequency in one of 24 the two interfering wave fields is shifted by an L1w relative to amount the other one during reconstruction /8,9/. 19 ) electronic phase- meter as the phase of the intensity signal oscillating with the beat fre- quency L1 w/nr independent of the mean intensity and of the fr inge con- trast.
31) where i is the imaginary unit. With this C(x,y), the intensity I(x,y) is rewritten I(X,y);o A(X,y>+C(X,y>+C * (X,Y) Here * denotes complex conjugation. 32 ) 37 If a two-dimensional discrete Fourier-transform is applied to the recorded intensity distribution I(x,y), the result is J(U,V)= A(U,v)+C(U,V)+C*(U,V) Although the further processing is performed on the complex distribution :J(u,v), for demonstration purposes the used. 33) amplitude spectrum /~(u,v)/ is In the amplitude spectrum, Jl(u,v) is the central peak, broadened by the influence of a varying background illumination.