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Investigation of the soundness of structures

  • US 4,128,011 A
  • Filed: 07/15/1975
  • Issued: 12/05/1978
  • Est. Priority Date: 07/16/1974
  • Status: Expired due to Term
First Claim
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1. A method of locating and determining the extent of any near surface structural void, shear plane, fault, inclusion zone, weakness or anomaly within a structure said method comprising the steps of:

  • transmitting a vibration wave of momentary fixed frequency over a large frequency range into and through said structure from a specific vibration input location and thereby producing vibration responses at various points in said structure;

    detecting the vibration responses at a plurality of detection locations spaced from said vibration input location over at least a substantial two dimensional structure area;

    determining the first frequency vibration responses at said detection locations; and

    plot connecting the detection location points of maxima or resonance frequency to indicate the presence and to define by contour outline the location, size and nature of a void, shear plane, fault, inclusion, zone of weakness, or anomaly within said structure.

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