Abstract
In this paper the theoretical study and experimental work to improve the ability of flaw identification in an ALOK imaging system are presented. After flaws have reliably been detected by TTLC method, the migration imaging can be executed with lesser computation time only for a determined small space. Then two methods, ALC method and instantaneous phase correlations, are introduced to decide the features of pattern recognition. The experimental results of two kinds of artificial defects, holes and cracks, show that the improvement on flaw identification has been obtained.
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References
O.A.Barbian, B. Grohs and R.Licht, Signalanhebung durch Enststoerung von Laufzeit-Messwerten aus Ultraschallpruefungen von ferritischen und austenitischen Werkstoffen—ALOK (Ampiitude-Laufzeit-Ortskurve)-Teil 1, Materialpruef. 23:379(1981)
B.Grohs, O.A.Barbian, W.Kappes and H.Paul, Fehlerbeschreibung nach Art, Lage und Dimension mit Hilfe von Laufzeit-Ortskurven aus Ultraschal1-pruefungen-ALOK-Teil 2, Materialpruef. 23:427(1981)
W.Kappes, B. Grohs and O.A.Barbian, Berechnung von Lauf zei f-Ortskurven fuer die Tandempruefung mit Ultraschall und Fehler läge-Rekonstruktion aus Tandem-Lauf zeit-Ort s kurven beim ALOK-Verfahren-ALOK-Tei 1 3, Materialpruef. 24:161(1982)
J.D.Achenbach, A.K.Gautesen and H.McMaken, “Ray Methods for Waves in Elastic Solids,” PITMAN PUBLISHING INC, Boston-London-Melbourne(1982)
A.J.Berkhout, “Seismic Migration,” ELSEVIER SCIENTIFIC PUBLISHING COMPANY, Amsterdam-Oxford-New York(1980)
Yu Wei, Inverse Problem in Imaging, Lecture in the Seminar on Ultrasonic Testing, Nanjing(1985)
J.D.Achenbach, L. Adler, D.K.Lewis and H.McMaken, Diffraction of Ultrasonic Waves by Penny-Shaped Cracks in Metals: Theory and Experiment, J.Acoust. Soc. Amer. 66:1848(1979)
Yu Wei, Ming Shen and Xing-Quen Zhao, “A Study of ALOK Method,” Proceeding of the Second NDT Conference, China(1984)
J.Krautkraemer and H.Krautkraemer, Werkstoffpruefung mit Ultraschall, translated in Chinese(1984)
Wang Shuo-Zhong, The Diffracted Acoustic Field around a Wedge, ACTA ACUSTICA 10:247(1985)
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© 1987 Plenum Press, New York
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Wei, Y., Zhao, Xq. (1987). Flaw Identification in ALOK Imaging Systems. In: Jones, H.W. (eds) Proceedings of the Fifteenth International Symposium, July 14–6, 1986. Acoustical Imaging, vol 15. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5320-1_24
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DOI: https://doi.org/10.1007/978-1-4684-5320-1_24
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-5322-5
Online ISBN: 978-1-4684-5320-1
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