Patrick Gaydecki (Inventor), Frederick Burdekin (Inventor)

    Research output: Patent


    A method and apparatus for detecting the presence and condition of components or defects embedded in a non-homogeneous body, in which the body is first insonated with an acoustic signal including a predetermined band of frequencies, for example from 0 to 400 kHz. A receiver transducer is positioned in contact with the body, to detect acoustic signals. Detected signals are transformed to the frequency domain to produce a frequency spectrum. The signals are then filtered to produce output signals representing the magnitude of the acoustic signals in each of at least two discrete frequency bands. The magnitudes of the output signals are then compared to derive frequency dependent data relating to defects in the body. The invention enables ultra-sonic techniques to be applied to the detection of small faults in non-homogeneous materials such as concrete.

    Original languageEnglish
    Patent numberWO9208128
    IPCG01N 29/ 46 A I
    Priority date30/10/90
    Publication statusPublished - 14 May 1992


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