By Werner Jüptner, Thomas Kreis
Internationally famous specialists within the box of holographic interferometric checking out, X-ray trying out, and structural research via finite point options have come jointly in ESPRIT undertaking 898 to strengthen a process that integrates those innovations. the program acts as an exterior interface among the complementary nondestructive checking out tools and laptop established structural research. within the e-book the trying out and research thoughts are provided and in comparison with detailed emphasis on difficulties concerning their mix and integration. The structure and the parts of the interface process are defined. Experiments proving the feasibility and applicability of the ideas are offered. The chapters of the publication facing the various ideas are written by means of the person companions of the undertaking. a typical try out item is investigated by means of all recommendations. The booklet is helping the buyer to choose the trying out and research strategy 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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Additional info for An External Interface for Processing 3-D Holographic and X-Ray Images
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.
For phase unwrapping the differences of adjacent pixels In Fig. 24 are investigated. the pattern of differences in the vertical direction of the phase distribution of Fig. 22 is shown. At most ces, displayed in gray, occur. High differences pixels small differen- occur at the 27r-steps, Fig. 22: Interference phase distri- Fig. 23: Interference phase dibution, calculated with stribution, calculated bandpass-filter I with bandpass-filter 2 they are displayed in white for the increasing and in black for the decreasing case.
Waves well separated The hologram must be exactly repositioned. Due to these reasons, the heterodyne technique is restricted to scientific applications in laboratory environments. In sandwich holographic interferometry the two object waves that should intefere are recorded in two separate photographic plates other but with parallel to a gap between /10/. During reconstruction these two holo- grams together may be shifted or tilted mutually or they may be tilted multaneously each with regard to the si- reference wave that remains unchanged.
An External Interface for Processing 3-D Holographic and X-Ray Images by Werner Jüptner, Thomas Kreis