Defect characterization by ultrasonic diffraction techniques

Jorma Pitkänen

Research output: Book/ReportReport


Different ultrasonic diffraction techniques are described. Two diffraction techniques have been chosen for the experiments. Three steel blocks with notches of different sizes and orientations were tested with satellite-pulse-observation (SPOT) and peak-echo techniques (PE). The shear-wave mode was used in the experiments. The best results in sizing defects were achieved by using the peakecho technique with a 45° angle probe. The average error was -0.5 mm and the standard deviation ±1.3 mm. The corresponding values using the same technique and a 60° angle probe were 2.8 mm and ±2.1 mm. The average error was -0.5 mm and standard deviation ±2.3 mm by transit time differences in SPOT. The evaluation from the frequency content in sizing defects by SPOT gave an average error of -0.3 mm and a standard deviation of ±2.3 mm.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages40
ISBN (Print)951-38-2721-6
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


  • ultrasonic tests
  • nondestructive tests


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