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  • 1
    Electronic Resource
    Electronic Resource
    Fresnel arrays for the study of Lamb waves in laser ultrasonics (1994)
    Springer
    Journal of nondestructive evaluation 13 (1994), S. 33-42 
    Details
    ISSN: 1573-4862
    Keywords: Laser ultrasonics ; Lamb waves ; Fresnel arrays ; dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract An experimental technique is proposed to analyze and control laser-generated Lamb waves propagating in aluminum plates. The technique consists in forming on the surface of the specimen an array of concentric arc sources by passing the laser beam through a Fresnel lens. The spacing between the illuminated arcs produces a “forcing wavelength” for which only a few specific frequencies (those which satisfy the dispersion relation) can propagate in the sample. Dispersion curves can be obtained by measuring the frequency content of the received signals for a range of wavenumbers. The technique offers a relatively high signal-to-noise ratio because of the narrow-band nature of the method and because of the confocal geometry of the source distribution. Reasonably good agreement is obtained between theoretical and experimental dispersion curves especially for the lower modes, thus showing that the proposed technique may have some potential for some specific applications in laser ultrasonic nondestructive evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00723945
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  • 2
    Electronic Resource
    Electronic Resource
    Directional laser generation and detection of ultrasound with arrays of optical fibers (1990)
    Springer
    Journal of nondestructive evaluation 9 (1990), S. 271-277 
    Details
    ISSN: 1573-4862
    Keywords: Laser ultrasonics ; directional ultrasound ; arrays of optical fibers ; thermoacoustic arrays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Some aspects of the generation and detection of ultrasound with laser beams are presented. The objective of the study is (1) to present some experimental results on the generation of ultrasound with an array of optical fibers, (2) to discuss the possibility of generating directional surface waves with acousto-optic scanning in a very narrow frequency band, thus increasing the signal-to-noise ratio, and (3) to discuss the feasibility of the directional detection of ultrasound by using an array of optical fibers as a receiver, also with the goal of increasing the signal-to-noise ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565645
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    Paper (German National Licenses)
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