Journal of Nondestructive Evaluation

, Volume 16, Issue 4, pp 193–203

A 3-D Image Detection Method of a Surface Opening Crack in Concrete Using Ultrasonic Transducer Arrays

  • Young-Fo Chang
  • Chung-Yue Wang

DOI: 10.1023/A:1021843930620

Cite this article as:
Chang, YF. & Wang, CY. Journal of Nondestructive Evaluation (1997) 16: 193. doi:10.1023/A:1021843930620


The detection of the size and the location of existing three dimensional cracks in a concrete structure is an important topic in civil engineering. In this paper, a multisource, multireceiver method that considers the travel times diffracted by a crack tip is introduced, to backcalculate a 3-D image of the crack tip of a surface opening crack. The possible location of the crack tip front is on the surface of an ellipsoid, which is constructed by a fixed travel time length measured from the source to the receiver, by letting the source and receiver points be the foci of the corresponding ellipsoid. If the locations of the source and the receiver, together with the associated measured travel time of the diffracted echo between each source-receiver pair are known, the image of the tip can be determined by counting the number of intersections of the ellipsoidal surfaces in an image construction cellular structure. The backcalculated crack tip image, as seen from experimental data, match the dimensions of the real crack very well, demonstrating the capability and accuracy of this newly proposed multisource, multireceiver method for concrete NDE.

Nondestructive evaluation NDE concrete crack image ultrasonic ellipsoid migration 

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • Young-Fo Chang
    • 1
  • Chung-Yue Wang
    • 2
  1. 1.Institute of Applied GeophysicsNational Chung-Cheng UniversityChia-YiTaiwan, R.O.C
  2. 2.Department of Civil EngineeringNational Central UniversityChungliTaiwan, R.O.C

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