Conventional ultrasonics techniques for detecting defects at any great depths in thick steel give poor resolution because of beam spread. One partial answer to the problem is the use of ultrasonic holography techniques in which an image is formed of the defect; resolution is limited only by wavelength factors. However, the drawback to this technique is that it is not very satisfactory for real time since there is a waiting period between the examination and the visual presentation of data. Attempts to computerize the holographic process have not been very successful. As an alternative, in cases where a short timescale is essential, the authors propose a simple means of improving the resolution in ultrasonic data by means of unfolding techniques. The results of the study were encouraging and indicate that, under some conditions, the techniques do improve resolution. More work is required to establish the approach with certainty and to investigate its limitations, especially with regard to defects having a more complex shape.

  • Corporate Authors:

    IPC Science and Technology Press Limited

    IPC House, 32 High Street
    Guildford, Surrey  England 
  • Authors:
    • Silk, M G
    • Lidington, B H
  • Publication Date: 1975-4

Media Info

  • Pagination: p. 84-99
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00172593
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 29 1978 12:00AM