By Werner Jüptner, Thomas Kreis
Internationally well-known specialists within the box of holographic interferometric checking out, X-ray checking out, and structural research through finite aspect concepts have come jointly in ESPRIT venture 898 to improve a process that integrates those innovations. the program acts as an exterior interface among the complementary nondestructive trying out tools and laptop established structural research. within the e-book the trying out and research thoughts are provided and in comparison with designated emphasis on difficulties concerning their blend and integration. The structure and the parts of the interface process are defined. Experiments proving the feasibility and applicability of the strategies are awarded. The chapters of the booklet facing the several recommendations are written by way of the person companions of the venture. a standard try out item is investigated via all suggestions. The publication is helping the buyer to pick the trying out and research technique best suited for his challenge. It additionally provides the historical past for increase built-in trying out gear for research and control.
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Extra resources for An External Interface for Processing 3-D Holographic and X-Ray Images
Fig. 18: Amplitude spectrum of Fig. 20 or one of Fig. 21. The passbands here are displayed in white, the stop- bands in black. The inverse transform and application of the complex rithm, Eq. 34), shown in Fig. 22 for the filter of Fig. 23 for the as given in Fig. 21. Here - rr is displayed in black, +rrin white, Fig. 20: Bandpass-filter 1 Fig. 21: Bandpass-filter 2 41 the other values are mapped linearly to gray-values. For phase unwrapping the differences of adjacent pixels In Fig. 24 are investigated.
By mechanical scanning of a pair or a triplet of detectors over the reconstructed real image of the points are objcect, phase differences at adjacent determined pointwisely. The overall interference phase distri- bution then is calculated by integration without sign ambiguity. The heterodyne technique gives the highest accuracy of all investigated methods in the determination of the interference phase, but it demands extremely stable optical arrangements with two reference from each other. waves well separated The hologram must be exactly repositioned.
LAM, J. C. WYANT: High precision deformation measurement by digital phase shifting holographic interferometry, Appl. , vol. 24, 3780 - 3783 (1985) /15/ P. HARIHARAN, B. F. OREB, N. BROWN: Real-Time holographic interferometry: a microcomputer system for the measurement of vector displacement, Appl. 22, 876-880 (1983) /16/ TH. KREIS: Digital holographic interference-phase measurement using the Fourier transform method, Journ. Opt. Soc. Am. A, vol. 3, 847 - 855 (1986) /17/ TH. KREIS: Fourier transform evaluation of holographic Proc.
An External Interface for Processing 3-D Holographic and X-Ray Images by Werner Jüptner, Thomas Kreis