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  • 1
    Online Resource
    Online Resource
    Theoretische Grundlagen der Zerstörungsfreien Materialprüfung Mit Ultraschall. (2009)
    Basel/Berlin/Boston :Walter de Gruyter GmbH,
    Details
    Keywords: Ultrasonic testing. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (664 pages)
    Edition: 1st ed.
    ISBN: 9783486598599
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=1345432
    DDC: 531.382
    Language: German
    Note: Intro -- Geleitwort -- Vorwort -- Inhaltsverzeichnis.
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  • 2
    Electronic Resource
    Electronic Resource
    Pulse propagation over smooth irregular terrain (1978)
    Springer
    Applied physics 15 (1978), S. 31-42 
    Details
    ISSN: 1432-0630
    Keywords: 02.30 ; 84.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The source of the electromagnetic field is assumed to be a vertical electric dipole at height ξ above the surface of the plane earth with arbitrary time varying moment. The problem of finding the transient field of this dipole when the earth is allowed to be slightly rough is solved by means of a perturbation analysis, repeated application of integral transforms and their inversion on the base of Cagniard's method with the modification of de Hoop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896887
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Analytical representation of transient ultrasonic phased-array near- and far-fields (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 53-66 
    Details
    ISSN: 1573-4862
    Keywords: ultrasonic transducers ; phased array ; ultrasonic imaging ; impulse response ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The present contribution provides a method for the derivation of analytical near- and far-field expressions for the pressure step-function response of nonuniformly excited ultrasonic transducers modeled as pistons of arbitrary shape in an infinite rigid baffle. Explicit inversion of the Laplace transformed ultrasonic field using Cagniard's idea results in elementary functions or definite integrals of elementary functions, depending on the assumed nonuniform aperture distribution. The basic signal distortion is illustrated in terms of three-dimensional space-time plots of the pressure unit step-function response of a rectangular uniform aperture. The corresponding results for a phased-array transducer are also given. In addition, we investigate the pressure profile on the axis perpendicular to a uniform rectangular piston and its horizontal radiation pattern for different bandwidths of the exciting impulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566231
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    Paper (German National Licenses)
    Fulltext
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