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 |  موضوع: كتاب New Procedures in Nondestructive Testing الأحد 13 أغسطس 2023, 3:14 am | |
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أخواني في الله
أحضرت لكم كتاب
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
و المحتوى كما يلي :
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
11. 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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