New Procedures in Nondestructive Testing

New Procedures in Nondestructive Testing
Proceedings ofthe Germany-U.S. Workshop Fraunhofer-Institut, Saarbriicken, Germany
Aug. 30 – Sept. 3, 1982
Editor
p. Holler
With 369 Figures
Contents

1. PROBES, DATA ACQUISITION AND DATA PRE-PROCESSING DURING
   ULTRASONIC TESTING .
   1.1 REQUIREMENTS FOR THE DATA ACQUISITION DURING ULTRASONIC
   TESTING. SEARCH TECHNIQUES AND DEFECT ANALySIS . 3
   G. Engl,
   KWU, Erlangen
   V. Schmitz and O.A. Barbian
   IzfP, SaarbrUcken
   1.2 HARDWARE-EQUIPMENT FOR AUTOMATIC ULTRASONIC INSPECTION BY
   THE ALOK-TECHNIQUE . 13
   R.K. Neumann and O.A. Barbian
   IzfP, SaarbrUcken
   1.3 NUMERICAL FILTERING OF ULTRASONIC BACKSCATTERED SIGNALS. 27
   H.J. Pongratz, H. Willems, and W. Arnold
   IzfP, SaarbrUcken
   1.4 LOGARITHMIC ANALOG-TO-DIGITAL CONVERSION – A NEW CONCEPT
   FOR THE PROCESSING OF ULTRASONIC DATA 33
   K. Abend
   NUKEM, Hanau
   1.5 PRINCIPLES AND PRACTICAL APPLICATIONS OF CONTROLLED
   SIGNALS 43
   W. Oppermann, H.-A. Crostack, and H. Morlo
   University of Dortmund
   1.6 ULTRASONIC PLATE TESTING WITH A FREELY PROGRAMMABLE
   ELECTRONIC SYSTEM 53
   P. Moller
   Karl Deutsch Comp., Wuppertal
   1.7 MICROPROCESSOR CONTROLLED UT-EQUIPMENT . 63
   U. Opara
   Krautkramer, KolnXVI
   1.8 EMUS-PROBES FOR BULK WAVES AND RAYLEIGH WAVES. MODEL FOR
   SOUND FIELD AND EFFICIENCY CALCULATIONS 71
   A. Wilbrand
   IzfP, SaarbrUcken
   1.9 TRANSIENT RADIATION PATTERN OF ULTRASONIC TRANSDUCERS
   ON ELASTIC HALF-SPACES 81
   U. Aulenbacher
   Theoretische Elektrotechnik, Universitat d. Saarlandes
   and
   K.J. Langenberg
   IzfP, SaarbrUcken
2. CLASSIFICATION AND RECONSTRUCTION OF DEFECTS BY ULTRASONIC
   TESTING . 93
   2.1 CLASSIFICATION AND RECONSTRUCTION OF DEFECTS BY COMBINED
   ACOUSTICAL HOLOGRAPHY AND LINE-SAFT . 95
   V. Schmitz, W. MUller, and G. Schafer
   IzfP, SaarbrUcken
   2.2 PULSE-SYNTHESIS AND PULSE-ADAPTATION IN ULTRASONIC
   IMAGING FOR NDT 105
   H. Ermert, D. Hiller, and J. Schmolke
   Dept. of Electrical Engineering
   University of Erlangen-NUrnberg
   2.3 ACOUSTIC IMAGING . 113
   G.S. Kino, D.K. Peterson, and S.D. Bennett
   Edward L. Ginzton Laboratory, Stanford University,
   Stanford, California
   2.4 VISUALIZATION OF ULTRASOUND BY OPTICAL HOLOGRAPHy . 127
   H.-A. Crostack, A. KrUger, and W.R. Fischer
   University of Dortmund
   2.5 INSPECTION OF THICK-WALLED COMPONENTS BY ULTRASONICS
   AND EVALUATION OF THE DATA BY THE ALOK-TECHNIQUE 133
   O.A. Barbian, B. Grohs, W. Kappes, and Ch. Hullin
   IzfP, SaarbrUckenXVII
   2.6 AN ULTRASONIC PHASED ARRAY SYSTEM FOR DEFECT CLASSIFICATION
   AND RECONSTRUCTION 151
   W. Gebhardt
   IzfP, SaarbrUcken
   2.7 ULTRASONIC CHARACTERIZATION OF ROUGH CRACKS . 163
   L. Adler and K. Lewis
   Department of Welding Engineering,
   Ohio State University, Columbus, Ohio
   and
   M. de Billy and G. Quentin
   Groupe de Physique des Solides, Universite Paris VII,
   Paris
   2.8 SURFACE CRACKS: SIZE AND FAILURE PREDICTION USING LONG
   WAVELENGTH MEASUREMENTS 175
   J.J. Tien, K. Liang, B.T. Khuri-Yakub, G.S. Kino,
   Ginzton Laboratory, Stanford University, Stanford CA
   and
   D.B. Marshall and A.G. Evans
   Department of Materials Science & Mineral Engineering
   University of California, Berkeley, California
   2.9 CHARACTERIZATION OF SURFACE DEFECTS BY RAYLEIGH-WAVES . 193
   A. Klein and H.J. Salzburger
   IzfP, SaarbrUcken
   2.10 FREQUENCY DEPENDENT INTERACTION OF ULTRASONIC WAVES WITH
   SURFACE-BREAKING CRACKS . 203
   D.W. Fitting and L. Adler
   Department of Welding Engineering, Ohio State
   University, Columbus, Ohio
   2.11 MEASUREMENT OF CRACK DEPTH WITH ULTRASONIC METHODS.
   THROUGH TRANSMISSION- AND REFLECTION MODES 213
   H. WUstenberg, A. Erhard, H.-J. Montag, and G. Schenk
   BAM, Berlin
   2.12 SIZING OF NEAR-SURFACE FATIGUE CRACKS IN CLADDED PRESSURE
   VESSELS BY THE MULTIPLE BEAM-SATELLITE PULSE TECHNIQUE 229
   G.J. Gruber
   Southwest Research Institute, San Antonio, TexasXVIII
   2.13 A FEATURE BASED ULTRASONIC SYSTEM FOR REFLECTOR
   CLASSIFICATION 239
   J.L. Rose
   Drexel University, Philadelphia
3. FORWARD SCATTERING . 251
   3.1 RESONANCE SCATTERING METHODS FOR NOT, ACOUSTICS, AND
   RADAR 253
   H. tiberall, P.J. Moser, A. Nagl, and J.V. Subrahmanyam
   Department of Physics, Catholic University,
   Washington,D.C.,
   P.P. Delsanto, J.D. Alemar, and E. Rosario
   Department of Physics, University of Puerto Rico,
   Mayaguez, P.R.,
   G.C. Gaunaurd and E. Tanglis
   Naval Surface Weapons Center, White Oak, Silver
   Spring, MD
   and
   D. Brill
   Department of Physics, U.S. Naval Academy, Annapolis,MD
   3.2 SCATTERING OF ULTRASONIC WAVES IN SINGLE PHASE
   POLYCRYSTALLINE METALS INCLUDING MULTIPLE SCATTERING 265
   S. Hirsekorn
   IzfP, SaarbrUcken
   3.3 RESULTS ON BROADBAND SCATTERING AND DIFFRACTION SUGGEST
   METHODS TO CLASSIFY AND RECONSTRUCT DEFECTS IN QNDE . 277
   R.B. Tittmann and J.M. Richardson
   Rockwell International Science Center,
   Thousand Oaks, California
   and
   F. Cohen-Tenoudji, G. Quentin
   University of Paris VII, Paris
   3.4 NDE TECHNIQUE FOR DETECTION AND CHARACTERIZATION OF
   POROSITY 287
   D.O. Thompson, S.J. Wormley, J.H. Rose,
   and R.B. Thompson
   Ames Laboratory, Iowa State University, Ames IAXIX
   3.5 EFFECTS OF MUTUAL COUPLING BETWEEN DIFFERENT POINTS OF
   A SCATTERER ON IMAGING 305
   H. Chaloupka
   Institut fUr Hoch- und Hochstfrequenztechnik
   Ruhr-Universitat Bochum
   3.6 FORWARD AND INVERSE ULTRASONIC SCATTERING MEASUREMENTS
   IN REALISTIC GEOMETRIES 317
   R.B. Thompson, T.A. Gray, D.K. Hsu, J.H. Rose, and
   D.O. Thompson
   Ames Laboratory, Iowa State University, Ames, IA
   3.7 BULK DEFECT CHARACTERIZATION USING SHORT WAVELENGTH
   MEASUREMENTS . 337
   C.H. Chou, K. Liang, B.T. Khuri-Yakub, and G.S. Kino
   E.L. Ginzton Laboratory, Stanford University,
   Stanford, California
4. INVERSE SCATTERING . 355
   4.1 IDENTIFICATION AND PARAMETRIC MODELING OF TRANSIENT WAVES
   357
   D.G. Dudley
   Department of Electrical Engineering, The University
   of Arizona, Tucson, Arizona
   4.2 RAY METHODS FOR SCATTERING OF ULTRASONIC WAVES BY CRACKS
   369
   J.D. Achenbach and A.N. Norris
   The Technological Institute, Northwestern University,
   Evanston, IL
   4.3 INVERSE SCATTERING ALGORITHMS . 381
   K.J. Langenberg, D. BrUck, and M. Fischer
   IzfP, SaarbrUcken
   4.4 EXACT DIRECT AND INVERSE SCATTERING IN SPATIAL
   FREQUENCY/TIME SPACE . 393
   W.R. Stone
   IRT Corporation, San Diego, CA 92138xx
   4.5 APPLICATION OF HIGH FREQUENCY INVERSE SCATTERING TO
   NONDESTRUCTIVE TESTING . 403
   N. Bleistein and J.K. Cohen
   Department of Mathematics and Computer Science,
   University of Denver, Denver, CO
   4.6 EXTENSIONS OF RADON’S PROJECTION THEORY IN RADAR TARGET
   SHAPE RECONSTRUCTION
   W.-M. Boerner, V.K.S. Mirmira, A.C. Manson,
   C.-W. Yang, and A.K. Buti
   Communications Laboratory, Department of Electical
   Engineering and Computer Science, University of
   Illinois at Chicago Circle, Chicago, IL
   4.7 IMPLEMENTATION OF INVERSE-SCATTERING ALGORITHMS FOR
   413
   CHARACTERIZING VOIDS IN GAS TURBINE ROTOR DISCS . 425
   G.J. Gruber
   Southwest Research Institute, San Antonio, Texas
5. ACOUSTIC EfJiISSION 435
   5.1 PROPAGATION AND SCATTERING OF HIGH-FREQUENCY AND PULSED
   SIGNALS IN THE PRESENCE OF A CONCAVE BOUNDARY . 437
   L.B. Felsen
   Department of Electrical Engineering and Computer
   Science, Polytechnic Institute of New York,
   Farmingdale, New York
   5.2 TRANSFER-FUNCTIONS CHARACTERIZING THE PROPAGATION
   OF AE-SIGNALS 447
   E. Waschkies
   IzfP, SaarbrUcken
6. ELECTRICAL AND MAGNETICAL METHODS
   THEORY AND APPLICATIONS 459
   6.1 NUMERICAL MODELING OF ELECTROMAGNETIC NDT PHENOMENA 461
   W. Lord
   Department of Electrical Engineering, Colorado
   State University, Fort Collins, COXXI
   6.2 A MODEL FOR THE INTERPRETATION OF A.C. MAGNETIC STRAY
   FLUX MEASUREMENTS . 471
   G. Walle and G. Dobmann
   IzfP, SaarbrUcken
   6.3 DEVELOPMENTS AND INVESTIGATIONS FOR THE APPLICATION
   OF THE PULSED EDDY CURRENT TECHNIQUE . . 479
   G. Wittig, H.-M. Thomas, and D. Maser
   BAM, Berlin
   6.4 ANALYTICAL METHODS IN FLAW RESPONSE MODELING AND INVERSION
   FOR EC TESTING 489
   B.A. Auld, F. Muennemann, and M. Riaziat
   E.L. Ginzton Laboratory, Stanford University,
   Stanford, California
   6.5 DEFECT CLASSIFICATION BY MULTI-MULTIFREQUENCY EDDY CURRENT
   497
   R. Becker and K. Betzold
   IzfP, SaarbrUcken
   6.6 MATERIALS TESTING BY SELF-EXCITED SQUARE-WAVE OSCILLATIONS
   WITH NEW LIFT-OFF COMPENSATION 509
   M. Lambeck
   Fachbereich Physik, Technische Universitat, Berlin
7. NONDESTRUCTIVE STRESS MEASUREMENT 519
   7.1 MEASUREMENT OF STRESS 521
   G.S. Kino, D. Husson, and S. Bennett
   Ginzton Laboratory, Stanford University, Stanford CA
   7.2 THE USE OF THE TEMPERATURE DEPENDENCE OF ULTRASONIC
   VELOCITY TO MEASURE APPLIED AND RESIDUAL STRESSES . 539
   K. Salama and J.J. Wang
   Mechanical Engineering Department, University of
   Houston, Houston, Texas
   7.3 DETERMINATION OF MECHANICAL STRESS BY POLARIZED SHEAR WAVES
   551
   E. Schneider and K. Goebbels
   IzfP, SaarbrUckenXXII
   7.4 COMPARISON OF DIFFERENT METHODS TO DETERMINE RESIDUAL
   STRESSES NONDESTRUCTIVELY
   V. Hauk, P. Stuitje
   Institut fUr Werkstoffkunde, RWTH, Aachen
   E. Schneider, W. Theiner
   IzfP, SaarbrUcken
   7.S DETERMINATION OF RESIDUAL STRESSES USING MICROMAGNETIC
   ~61
   PARAMETERS 575
   W. Theiner and I. Altpeter
   IzfP, SaarbrUcken
   7.6 MEASURING OF CLOSURE FORCES WITH ULTRASONIC DIFFRACTED WAVES
   587
   S. Golan and R. Arone
   Israel Institute of Metals, Technion, Haifa
   LIST OF ATTENDEES . 597
   s
   (*: Presenting Authors)

• J.D. Achenbach
  The Technological Institute
  Department of Civil Engineering
  Northwestern University
  Evanston, IL 60201, USA
• L. Adler
  Department of Welding Engineering
  Ohio State University
  190 West 19th Avenue
  Columbus, OH 43210, USA
  I. Altpeter
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
• W. Arnold
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
• B.A. Auld
  Edward L. Ginzton Laboratory
  Stanford University
  Stanford, CA 94305, USA
• O.A. Barbian
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  K.-D. Becker
  Fachbereich Angewandte Physik
  Universitat des Saarlandes
  D-6600 SaarbrUcken 11, FRG
• R. Becker
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  G. Birnbaum
  National Bureau of Standards
  Washington, D.C. 20234, USA
• N. Bleistein
  Department of Mathematics
  University of Denver
  Denver, CO 80210, USA598
• W.M. Boerner
  *
  *
  Electromagnetic Imaging Division
  Communications Laboratory
  University of Illinois
  P.o. Box 4348
  Chicago, IL 60680, USA
  M. Buckley
  Rockwell International Science Center
  1049 Camino Dos Rios
  Thousand Oaks, CA 91360, USA
  A.F. Brown
  City University
  St. Johns Street
  London, England
  D. BrUck
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  N. Brugger
  Fachbereich Werkstoffkunde II
  Universitat Karlsruhe
  D-7500 Karlsruhe, FRG
  H. Busse
  Kraftwerk Union AG
  D-8520 Er1angen, FRG
  H. Chaloupka
  Institut fUr Hoch- und Hochstfrequenztechnik
  Ruhr-Universitat Bochum
  Universitatsstrasse 150
  D-4630 Bochum 1, FRG
  G. Coen
  Betriebsforschungsinstitut
  Sohnstrasse
  D-4000 DUsseldorf, FRG
  H.-A. Crostack
  Lehrstuhl fUr Werkstofftechnologie
  Universitat Dortmund
  Postfach 500500
  D-4600 Dortmund, FRG
  W. Dickenscheid
  Fachbereich Angewandte Physik
  Universitat des Saarlandes
  D-6600 SaarbrUcken 11, FRG
• G. Dobmann
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG* D.G. Dudley
  Department of Electrical Engineering
  University of Arizona
  Tucson, Arizona 85721, USA
  A. Duncumb
  The Welding Institute
  Abington Hall
  Cambridge CB1 6AL, England
  J.W. Edwards
  GEC Hirst Research Centre
  East Lane
  Wembley HA9 7PP, England
• V G. Engl
  Kraftwerk Union AG
  Postfach 3220
  D-8520 Erlangen, FRG
• H. Ermert
  Institut fUr Hochfrequenztechnik
  Universitat Erlangen-NUrnberg
  Cauerstrasse 9
  D-8520 Erlangen, FRG
• L.B. Felsen
  *
  *
  Department of Electrical Engineering and Computer Science
  Polytechnic Institute of New York
  Farmingdale, N.Y. 11735, USA
  K. Fink
  Thomas-Mann-Str. 85
  D-4000 DUsseldorf 30
  M. Fischer
  Fachbereich Angewandte Physik
  Universitat des Saarlandes
  D-6600 SaarbrUcken 11, FRG
  D.W. Fitting
  Department of Welding Engineering
  Ohio State University
  190 West 19th Avenue
  Columbus, OH 43210, USA
  W. Gebhardt
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  R. Geldner
  Kraftwerk Union AG
  Postfach 3220
  D-8520 Erlangen, FRG
  599*
  R. Gillot
  MaterialprUfanstalt
  Pfaffenwaldring 32
  D-7000 Stuttgart 80, FRG
  K. Goebbels
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  S. Golan
  Israel Institute of Metals
  Technion, Haifa, Israel
  B. Grohs
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
• G.J. Gruber
  Southwest Research Institute
  6220 Culebra Road
  San Antonio, TX 78284, USA
  H. Hausmann
  Universitat Duisburg
  D-4100 Duisburg, FRG
  U. Haufe
  Bundesanstalt fUr MaterialprUfung
  Unter den Eichen 87
  D-1000 Berlin 45, FRG
• V. Hauk
  Institut fUr Werkstoffkunde
  Rheinisch-Westfalische Technische Hochschule
  Templergraben 55
  D-5100 Aachen, FRG
• S. Hirsekorn
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  P. Holler
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  Ch. Hullin
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  S. Jacke
  Bundesministerium fUr Forschung und Technologie
  D-5300 Bonn, FRG*
  D.M. Jacobson
  Materials Science Division
  GEC Hirst Research Centre
  East Lane
  Wernbley HA9 7PP, England
  P. Jax
  Kraftwerk Union AG
  Postfach 3220
  D-8520 Erlangen, FRG
  K.H. Janneck
  Rheinisch-Westfalischer Technischer Vberwachungs-Verein
  Steubenstrasse 53
  D-4300 Essen 1, FRG
  K. JUngling
  NUKEM GmbH
  D-6450 Hanau 2, FRG
  W. Kappes
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
• G.S. Kino
  E.L. Ginzton Laboratory
  Stanford University
  Stanford, CA 94305, USA
• A. Klein
  *
  *
  *
  Thyssen Niederrhein AG
  Postfach 106101
  D-4200 Oberhausen 1, FRG
  R. von Klot
  Brown Boveri & Cie.
  Kallstadter Str. 1
  D-6800 Mannheim 31, FRG
  B.T. Khuri-Yakub
  E.L. Ginzton Laboratory
  Stanford University
  Stanford, CA 94305, USA
  M. Lambeck
  Fachbereich Physik
  Technische Universitat
  Strasse des 17. Juni 135
  D-l000 Berlin 12, FRG
  K.J. Langenberg
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  601602
• W. Lord
  Department of Electrical Engineering
  Colorado State University
  Fort Collins, CO 80523, USA
  B.R. Martens
  Kraftwerk Union AG
  Postfach 3220
  D-8520 Erlangen, FRG
  H.J. Meckelburg
  HMFT
  Ruhr-Universitat
  Universitatsstrasse 150
  D-4630 Bochum 1, FRG
  F. Michalski
  Am Kirchberg
  D-6620 Volklingen, FRG
• P. Moeller
  *
  *
  Karl Deutsch GmbH
  Postfach 131891
  Otto-Hausmann-Ring 101
  D-5600 Wuppertal 1, FRG
  H. Morlo
  Universitat Dortmund
  August-Schmidt-Strasse
  D-4600 Dortmund-Eichlinghofen, FRG
  R. Neumann
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  U. Opara
  Krautkramer GmbH
  Postfach 420250
  Luxemburger Strasse 449
  D-5000 Koln 41, FRG
  W. Oppermann
  Universitat Dortmund
  August-Schmidt-Strasse
  D-4600 Dortmund, FRG
  Y.H. Pao
  Department of Theoretical and Applied Mechanics
  Cornell University
  Ithaca, N.Y. 14853, USA
• Z. Pawlowski
  IPPT-PAN

1. Cezeska 1M. 3
   P-03-902 Warszawa, PolandG.J. Quentin
   Groupe de Physique des Solides
   Universite Paris VII,
   “Marie et Pierre Curie”
   Tour 23, 4 Place Jussieu
   F-75230 Paris-Cedex 05, France
   J.R. Quinn
   Electric Power Research Institute
   3412 Hill View Avenue
   Palo Alto, CA 94303, USA

• J.L. Rose
  Department of Mechanical Engineering
  Drexel University
  Philadelphia, PA 19104, USA
  O. Rosenfelder
  Universitat Karlsruhe
  D-7500 Karlsruhe, FRG
• W. Sachse
  Department of Theoretical and Applied Mechanics
  Cornell University
  Ithaca, N.Y. 14853, USA
• K. Salama
  Mechanical Engineering Department
  University of Houston
  Houston, TX 77004, USA
  C.M. Sayers
  Atomic Energy Research Establishment
  Harwell, Oxfordshire OXll ORA, England
  H.J. Salzburger
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
• V . Schmitz
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  J. Schmolke
  Department of Electrical Engineering
  Universitat Erlangen-NUrnberg
  Cauerstrasse 9
  D-8520 Erlangen, FRG
• E. Schneider
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, Universitat
  D-6600 SaarbrUcken 11, FRG
  603604
• W.R. Stone
  IRT Corporation
  7650 Convoy Court
  P.O. Box 80817
  San Diego, CA 92138, USA
• W.A. Theiner
  *
  *
  *
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, UniversitSt .
  D-6600 SaarbrUcken 11, FRG
  D.O. Thompson
  Ames Laboratory
  Iowa State University
  Ames, Iowa 50011, USA
  R.B. Thompson
  Ames Laboratory
  Iowa State University
  Ames, Iowa 50011, USA
  H. Ueberall
  Department of Physics
  Catholic University
  Washington, D.C. 20064, USA
• E. Waschkies
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, UniversitSt
  D-6600 SaarbrUcken 11, FRG
  B. Werden
  Rheinisch-WestfSlischer Technischer Uberwachungs-Verein
  Steubenstrasse 53
  D-4300 Essen 1, FRG
• A. Wilbrand
  *
  *
  Fraunhofer-Institut fUr zerstorungsfreie PrUfverfahren
  Geb. 37, UniversitSt
  D-6600 SaarbrUcken 11, FRG
  G. Wittig
  Bundesanstalt fUr MaterialprUfung
  Unter den Eichen 87
  D-I000 Berlin 45, FRG
  H. Wlistenberg
  Bundesanstalt fUr Materialprlifung
  Unter den Eichen 87
  D-I000 Berlin 45, FRG
  Yan Renbo
  Institute of Acoustics
  Acacemia Sinica
  Peking, Peoples Republic of China

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