6. Technique Development and Probe Design for TOFD Method Application

  1. Mark V. Brook

Published Online: 2 JUL 2012

DOI: 10.1002/9781118104781.ch6

Ultrasonic Inspection Technology Development and Search Unit Design: Examples of Practical Applications

Ultrasonic Inspection Technology Development and Search Unit Design: Examples of Practical Applications

How to Cite

Brook, M. V. (2011) Technique Development and Probe Design for TOFD Method Application, in Ultrasonic Inspection Technology Development and Search Unit Design: Examples of Practical Applications, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9781118104781.ch6

Author Information

  1. West Hartford, Connecticut, USA

Publication History

  1. Published Online: 2 JUL 2012
  2. Published Print: 18 NOV 2011

ISBN Information

Print ISBN: 9780470874349

Online ISBN: 9781118104781

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Keywords:

  • band round waves;
  • Tandem probe;
  • time of flight diffraction (TOFD);
  • ultrasonic nondestructive testing (NDT)

Summary

The time of flight diffraction (TOFD) techniques are used primarily for detection and sizing the depth of crack-like flaws. When the transmitter and receiver are located not at the same distance from the crack opening, the technique is known as “ forward scattering asymmetric TOFD ”. In the case of the transmitter and the receiver are on the same side of the crack, and the technique can be referred to as “ back scattering TOFD ”. One of the designs based on this probe combination is known as Tandem . A Tandem probe consists of two wedges with crystal assemblies: receiver and transmitter. Another type of diffracted waves, so - called gliding waves, is used in ultrasonic nondestructive testing (NDT). When an oblique incident beam strikes a side-drilled hole, some of the rays, which are tangent to the hole surface produce a “ band round waves”.

Controlled Vocabulary Terms

nondestructive testing; probes; ultrasonic materials testing