Echo signal from rough planar interfaces influence of roughness, angle, range and transducer type

Jens E. Wilhjelm, P.C. Pedersen, S.M. Jacobsen, Kjeld Martinsen

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    The received electrical signal from a pulse-echo system insonifying a planar acoustical interface was measured for varying degrees of rms roughness (0-0.16 mm), angle of incidence (typically +/-7°) and range to the transducer. A planar and a focused 5 MHz transducer was used. When insonifying a smooth interface, the normalized spectrum of the received signals for a planar transducer exhibits an increasing number of nulls with increased angle of insonification, as predicted from numerical modeling while the dependence on insonification angle for the focused transducer was smaller and the null pattern was much less distinct. For the planar transducer and for the focused transducer with the interface located at the geometrical point of focus, the energy of the received signal as a function of incident angle was approximately Gaussian with maximum at 0°. For the smooth interface, the -3 dB width was ~0.5° and ~3° for the planar and the focused transducer, respectively
    Original languageEnglish
    JournalI E E E International Ultrasonics Symposium. Proceedings
    Pages (from-to)1839 - 1842
    Publication statusPublished - 1998
    Event1998 IEEE Ultrasonics Symposium - Sendai, Japan
    Duration: 5 Oct 19988 Oct 1998


    Conference1998 IEEE Ultrasonics Symposium
    Internet address

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