Defect characterization by ultrasonic diffraction techniques

Jorma Pitkänen

Research output: Book/ReportReportProfessional

Abstract

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

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume444

Fingerprint

standard deviation
ultrasonics
sizing
defects
pulses
diffraction
probes
transit time
notches
S waves
echoes
steels
deviation
evaluation

Keywords

  • ultrasonic tests
  • nondestructive tests

Cite this

Pitkänen, J. (1986). Defect characterization by ultrasonic diffraction techniques. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia, No. 444
Pitkänen, Jorma. / Defect characterization by ultrasonic diffraction techniques. Espoo : VTT Technical Research Centre of Finland, 1986. 40 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia; No. 444).
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Pitkänen, J 1986, Defect characterization by ultrasonic diffraction techniques. Valtion teknillinen tutkimuskeskus. Tutkimuksia, no. 444, VTT Technical Research Centre of Finland, Espoo.

Defect characterization by ultrasonic diffraction techniques. / Pitkänen, Jorma.

Espoo : VTT Technical Research Centre of Finland, 1986. 40 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia; No. 444).

Research output: Book/ReportReportProfessional

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PY - 1986

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N2 - 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.

AB - 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.

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Pitkänen J. Defect characterization by ultrasonic diffraction techniques. Espoo: VTT Technical Research Centre of Finland, 1986. 40 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia; No. 444).