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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Optics and Lasers in Engineering 13 (1990), S. 39-50 
    ISSN: 0143-8166
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics , Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 5 (1974), S. 142-146 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Non-destructive Testing by Laser Measuring Techniques  -  A New Holographic Method. Holographic Non Destructive Testing is well suited for materials with a low elasticity modulus or bad heat conductivity, like rubber, metal-rubber-connections, adhesive connections, plastics, and fiber-reinforced plastics. The advantage of holographic testing lies in the fact that a near to true stress is possible. This stress occurs with only a fraction of the force necessary to damage the part. In many cases there is a relation between the holographic evidence and the breaking limit. By a new method the evaluation of the holograms is much more easier, because only objects with defects are showing deformation fringes.
    Notes: In der zerstörungsfreien Werkstoffprüfung findet die Holographie vorzugsweise bei Werkstoffen mit niedrigem Elastizitätsmodul oder schlechten Wärmeleiteigenschaften (beispielsweise Gummi, Metall-Gummi-Verbindungen, Verklebungen, Kunststoffen, verstärkten Kunststoffen) Anwendung. Es ist aber auch eine Prüfung von metallischen Teilen möglich.Der Vorteil der holographischen Prüfung liegt in der Möglichkeit einer wirklichkeitsnahen Beanspruchung. Diese Beanspruchung geschieht nur mit einem Bruchteil der Last, die zur Zerstörung des Teils führen würde. In vielen Fällen läßt sich also eine Relevanz zwischen holographischer Aussage und der Bruchgrenze eines Bauteils angeben. Durch ein neues Verfahren läßt sich die Auswertung der holographischen Aufnahmen wesentlich vereinfachen, so daß nur Teile mit Fehlern Verformungslinien aufweisen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2002-01-01
    Description: The present paper discusses the various critical elements of a modal testing system based on pulsed-laser holographic ESPI measurements. Such system allows making very high spatial resolution measurements on panel-like structures at frequencies that are of relevance for the vibro-acoustic behavior.Next to the optical parts, the integration with the modal analysis procedure, including the integration of geometry and response information, is reviewed. The ESPI based Image-domain frequency response functions are accumulated frequency by frequency. Special attention is paid to the modal parameter extraction of the large DOF number data, for which a special data reduction scheme was developed. The approach has been applied to several case studies related to car panels. The research was conducted in the context of the Brite/Euram project SALOME and the EUREKA project HOLOMODAL.
    Print ISSN: 1070-9622
    Electronic ISSN: 1875-9203
    Topics: Mathematics
    Published by Hindawi
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