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    Volume 46, Issue 3 (May 2018)

    A Pulse Compression Technique for Improving the Temporal Resolution of Ultrasonic Testing

    (Received 17 January 2015; accepted 7 April 2017)

    Published Online: 2018

    CODEN: JTEVAB

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    Abstract

    It is difficult to interpret ultrasonic signals when the echoes that are reflected from the various target features overlap. In this paper, a pulse compression technique based on a combination of Wiener filtering and autoregressive (AR) spectral extrapolation is used to process ultrasonic signals to improve their temporal resolution. The influence of the AR order and the width of the frequency window in AR spectral extrapolation are discussed in detail, and optimal parameters are obtained. The technique is then applied to measure the size of the defects in a plate and discern two adjacent defects in a block using a phased array. It is shown that the widths of the defects in the plate were measured accurately and the two adjacent defects were distinguished well by the proposed technique.

    Author Information:

    Jiao, Jingpin
    Beijing University of Technology, Chaoyang District Beijing,

    Ma, Ting
    Beijing University of Technology, Chaoyang District Beijing,

    Hou, Song
    Beijing University of Technology, Chaoyang District Beijing,

    Wu, Bin
    Beijing University of Technology, Chaoyang District Beijing,

    He, Cunfu
    Beijing University of Technology, Chaoyang District Beijing,


    Stock #: JTE20150016

    ISSN:0090-3973

    DOI: 10.1520/JTE20150016

    Author
    Title A Pulse Compression Technique for Improving the Temporal Resolution of Ultrasonic Testing
    Symposium ,
    Committee A01