NDTnet 1998 March, Vol.3 No.3

ULTRASONIC INSPECTION of COPPER CANISTERS USING PHASE ARRAYS

T. Stepinski, P. Wu, E. Martinez *
In collaboration with SKB (Swedish Nuclear Fuel and Waste Management Co)

TABLE OF CONTENTS

Abstract

Objectives

Scope of work

Laboratory tests

Detecting artificial and natural defects

Grain noise suppression

Beam-forming of ultrasonic arrays in immersed solids

Examples of Elastic fields in Immersed Copper

References

  1. T. Stepinski, P. Wu, Ultrasonic Inspection of Nuclear Copper Canisters, SKB Projektrapport 97-01, December 1996.
  2. A.B. Day, An Investigation into Optimisation of NDT of Spent Nuclear Canisters - Phase III, report TWI 220343/1/95, April 1995.
  3. T. Stepinski, L. Ericsson , B. Eriksson and M. Gustafsson, Quasi Frequency Diversity Processing of Ultrasonic Signals - A Review, in Advances in Signal Processing for Non-Destructive Evaluation of Materials, X.P.V. Maldague, ed. Kluwer Academic Publ., 1994, pp. 49-58.
  4. M.G. Gustafsson, "Statistical Aspects of the Split Spectrum Technique". Doctoral Dissertation, Acta Universitatis Upsaliensis, Uppsala University, Sweden 1995. ISBN 91-554-3490-8.
  5. M.G. Gustafsson, "Nonliner Ultrasonic Clutter Supression Using Noncoherent Detector Statistics and Split Spectrum Processsing". UPTEC 97 063R. April 1997.
  6. T. Stepinski, and P. Wu, Ultrasonic Inspection of Nuclear Copper Canisters, SKB Projektrapport 97-08, August 1997.
  7. A. Macovski, "Ultrasonic imaging using arrays," Proc. IEEE 67: 484-495 (1979).
  8. W.H. Kummer, "Basic array theory," Proc. IEEE 80: 127-140 (1992).
  9. B.D. Steinberg and H.M. Subbaram, Microwave Imaging Techniques. John Wiley & Sons, Inc., New York, Chap. 3 (1991).
  10. P. M. Morse and K. U. Ingard, Theoretical Acoustics. McGraw-Hill Book Company, New York, Chap. 7, (1968).
  11. L.M. Brekhovskikh, Waves in Layered Media. 2nd Edition, Academic, New York, Chap. I, (1980).
  12. P. Wu, R. Kazys and T. Stepinski, "Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields--Part I: Errors due to the discrete Fourier transform and discretization," J. Acoust. Soc. Am. 99: 1339-1348 (1996).
  13. P. Wu, R. Kazys and T. Stepinski, "Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields--Part II: Characteristics as a function of angular range," J. Acoust. Soc. Am. 99: 1349-1359 (1996).
  14. P. Wu, R. Kazys and T. Stepinski, "Optimal selection of parameters for the angular pectrum approach to numerically evaluate acoustic fields," J. Acoust. Soc. Am, 101: (1997).
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Copyright © Rolf Diederichs, rd@ndt.net 1. Mar 1998
/DB:Article /AU:Stepinski_T /AU:Wu_P_ /AU:Martinez_E /CN:SE /CT:UT /CT:transducer /CT:array /ED:1998-03