New Methodology for Source Characterization in Pulse Velocity Testing

    Volume 32, Issue 6 (November 2009)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 5 October 2009

    Page Count: 16


    Tallavó, Fernando
    Research Assistant, Civil and Environmental Engineering Dept., Univ. of Waterloo, Waterloo, ON

    Cascante, Giovanni
    Associate Professor, Civil and Environmental Engineering Dept., Univ. of Waterloo, Waterloo, ON

    Pandey, Mahesh D.
    Professor, Civil and Environmental Engineering Dept., Univ. of Waterloo, Waterloo, ON

    (Received 7 February 2008; accepted 17 August 2009)

    Abstract

    The pulse velocity test (PVT) is an ASTM standard for the measurement of compressional wave velocities in geomaterials. The PVT is based only on the first arrival of the wave. Full-waveform analysis can be used to measure the variation in geomaterial properties with frequency but requires the dynamic characteristics of the transducers. This paper presents a new methodology for the dynamic characterization of ultrasonic transmitters based on experimental and numerical results. Different types of excitation pulses (input signals) are used, and their theoretical Fourier spectra are computed. The methodology is demonstrated using a piezoelectric accelerometer to measure the frequency response function of an ultrasonic transmitter (UT) (50 kHz). The complex exponential method is used to extract the dynamic properties of the transmitter from transient time signals. Experimental results show that this methodology can be used for the dynamic characterization of ultrasonic transmitters. Results from finite element numerical simulations of wave propagation agree with laboratory results.


    Paper ID: GTJ101689

    DOI: 10.1520/GTJ101689

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    Author
    Title New Methodology for Source Characterization in Pulse Velocity Testing
    Symposium , 0000-00-00
    Committee D18