Russian Journal of Nondestructive Testing

, Volume 49, Issue 6, pp 301–308 | Cite as

Comparative classification of flaws using ultrasonic-tomography methods and evaluation of the instantaneous frequency of echo signals

Acoustic Methods

Abstract

The results of the visualization of artificial reflectors of different shapes and a natural flaw of the faulty-fusion type in the bottom run are presented. The results of the evaluation of the instantaneous frequency, which is proposed as an additional informative index for shape classification of flaws, are presented for the same reflectors. A comparative analysis of the data that were obtained by these two methods was performed. The measurement results are represented in the form of B-scans for phased arrays, which provide a clear idea of the spatial location and configuration of reflectors, and in the form of diagrams of the dependences of the normalized frequency deviations for single dual transducers.

Keywords

instantaneous frequency of an ultrasonic pulse normalized frequency deviation reflectors echo signals flaw shape phased antenna array B-scan 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • O. V. Nemytova
    • 1
  • A. B. Rinkevich
    • 1
  • D. V. Perov
    • 1
  1. 1.Institute of Metal Physics, Ural DivisionRussian Academy of SciencesYekaterinburgRussia

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