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Principles of Computerized Tomographic Imaging Avinash C. Kak School of Electrical Engineering Purdue University Malcolm Slaney Originally: Schlumberger Palo Alto Research Currently: IBM Almaden Research Center Great News!!! Available NOW!!!! Our book has been republished by SIAM (Society of Industial and Applied Mathematics). Order it from SIAM's catalog or your favorite bookstore (i.e. Amazon).

S. Berliner, III's Ultrasonics Page ...

Specialty Engineering is part of an alliance of companies, which believes we should focus our collective energies on unsolved problems and minimize redundant efforts. It is in this spirit that we offer our list of material properties, complete with all of the updates. If you have any material properties that you would like to contribute to this alliance, than please contact Alan Selfridge.

Frontpage | Ultrasonic Testing in Pipe Extrusion Foreword from the Author This On-Line guide book is a HTML edition of seminars and publications from the author Rolf Diederichs. This hand book should give newcomers to the extrusion market help with decisions, or making for current user a further knowledge base for this technology. There are, even for Ultrasonic NDT users, some useful reading.

February 2000 Vol. 30, No. 2, 1218. Ultrasonic methods for characterizing polymeric material A classical method for polymer characterization and polymer process monitoring is making a comeback. Ingo Alig Dirk Lellinger For decades, ultrasonic techniques have been excellent tools for nondestructive testing and imaging. Although the relationships between material properties and acoustical ...

Non-Destructive Evaluation - Scanning Acoustic Microscopy (SAM) - Introduction Scanning acoustic microscopy (SAM) uses acoustic impedance to produce high resolution images of a sample s interior structure to detect difficult-to-find defects, such as interfacial separation (PEMs and PWBs), solderball delamination (BGAs), and die attach voiding (PEMs). Both delamination/cracking and die attach ...

Seawater Sound Speed Calculator ...

JPL's NDEAA Ultrasonic Drilling Homepage Principal Investigator: Dr. Yoseph Bar-Cohen, JPL JPL: Dr. Xiaoqi Bao, Dr. Zensheu Chang, Dr. Benjamin Dolgin and Dr. Stewart Sherrit Cybersonics, Inc.: Thomas Peterson (President), Dr. Dharmendra Pal, Ron Krahe and Jason Kroh This ultrasonic drilling mechanism does not require high axial load The USDC operated from a FIDO rover robotic arm The USDC ...

ULTRASONIC SETUP FOR FINGERPRINT PATTERNS DETECTION AND EVALUATION Wies aw Bicz* Zbigniew Gumienny** Dariusz Kosz* Mieczys aw Pluta** INTRODUCTION The scope of potential use of identification systems widens, including restricted area or confidential data access , credit card use etc. Only in 1993 banks lost more than three billions dollars due to credit cards forgery and misuse . No two ...

A new resource for all users of power ultrasonics. Describes the technology and applications and includes a searchable database of suppliers.

NDTnet - July 1997, Vol.2 No.07 Resonance inspection - the answer to new industrial demands with regard to quality assurance by U. Schlengermann, W. Hansen, Krautkramer GmbH & Co. * ABSTRACT The method introduced here is a resonance inspection method using mono-frequent pulses which can be generated by a digital signal generator in any frequency windows required. The signal transformation from ...

NDTnet - October 1997, Vol.2 No.10 THEORY AND APPLICATION OF PRECISION ULTRASONIC THICKNESS GAGING by By Kenneth A. Fowler, Gerry M. Elfbaum, Karen A. Smith and Thomas J. Nelligan * This is a copy of an article for our new NDTnet '97 CD-ROM. The original paper is located on the Panametrics NDT Division Homepage Besides this article you can find much more there, e.g., a comprehensive Database of ...

NDTnet - May 1997, Vol.2 No.05 WAVE MODES PRODUCED BY AIR COUPLED ULTRASOUND by Jan O. Strycek, Willem A. Grandia, and Hanspeter Loertscher * Presented on the Application Workshop in May '97 Table of contents Introduction AIR COUPLED ULTRASONIC SYSTEM TRANSDUCER CONFIGURATIONS AND WAVE MODES page! GUIDED PLATE WAVES - TWO-SIDED SHEAR WAVES IN THROUGH TRANSMISSION HONEYCOMBS CONCLUSION REFERENCES ...

The following article appears in the journal JOM, 48 (9) (1996), pp. 29-31. JOM is a publication of The Minerals, Metals & Materials Society Testing & Analysis CONTENTS INTRODUCTION THE ULTRASONIC TRANSDUCER HIP VESSEL TESTING RESULTS CONCLUSION ACKNOWLEDGEMENTS REFERENCES An Ultrasonic Sensor for High-Temperature Materials Processing David A. Stubbs and Rollie E. Dutton A sensor has been ...

NDTnet - July 1997, Vol.2 No.07 Ceramic Automotive Valves - Chances and Limitations of Nondestructive Testing by U. Netzelmann, H. Reiter, Y. Shi, J. Wang and M. Maisl * |Deutsch| Summary: Automotive valves made out of silicon nitride were investigated by various nondestructive testing techniques. Fluorescent dye penetrant testing was used to detect surface defects. High frequency ultrasound (80 ...

Full Text of this Article PDF Version of this Article Similar articles found in: JN Online PubMed PubMed Citation Search Medline for articles by: Oohashi, T. || Shibasaki, H. Alert me when: new articles cite this article Download to Citation Manager The Journal of Neurophysiology Vol. 83 No. 6 June 2000, pp. 3548-3558 Copyright 2000 by the American Physiological Society Inaudible High-Frequency ...

NDT.net 1998 December, Vol. 3 No. 12 Nondestructively Inspect Material Integrity With An Airborne Ultrasonic Beam Curlin Air Curlin Air Tech Note Technical Note by NDT Systems, Huntington Beach, CA, USA TABLE OF CONTENTS How & Why it Works The Ultrasonic Trek Energy and Amplitude Curlin-Air Compensation Application Notes: Composites Urethane Foams AN-1 Fiberglass AN-2 Construction & Building ...

NDTnet - February 1997, Vol.2 No.02 Synthesis of ultrasonic transducers directional diagram Authors: P.Prokhorenko, A.Baev, G.Konovalov, A.Mayorov Abstract The method of direction diagram control is present. The magnetic contact fluide use as active element for forming the direction diagram. The control are made by external magnetic field. It give the possibility to change the structure of ...

Visualization of ultrasound - video sequences and still photographs Video sequences - See the table of available sequences. Still photographs Scattering of ultrasound in water Video sequence - load it now 1. Ultrasonic waves in water approach an aluminiun cylinder of 20 mm diameter. Individual wavefronts are visible. The pulse train has emerged from an undamped transducer, located outside the ...

What the single beam saw... what the multi beam saw... And still they ask is it any better... Swath-Sonar Related Sites, available through the Ocean Mapping Group, UNB John E. Hughes Clarke &copy OMG/UNB Are you getting full bottom coverage 1996 USCHC Multibeam Course Comparisons 1997 USCHC Multibeam Course Comparisons Multibeam Training Courses Y2002 course details now available SE 4053 RESON ...

Ultrasonic Transducer Library - updated Mar '98 Originally publishedfor the Transducer Workshop in Sept '96 On this Page: |Articles| |Abstracts| |NEWS| |Workshop Topics| |WWW Library| |UT by A-Z| |Bibliography| |Transducer Market| Go: |Search| |Application WS Library Sep '96| For more information see Focus on Transducers in NDTnet 03/97 * updated Articles Piezoelectric/Composite Feasibility ...

Ultrasound physics. Definitions. Differences with X-rays ...

NDTnet 1998 March, Vol.3 No.3 AN EVALUATION OF EMAT TECHNOLOGY FOR HIGH-TEMPERATURE NDE Glenn M. Light, Ph.D., Joseph Demo, Ph.D. * TABLE OF CONTENTS ABSTRACT 1. INTRODUCTION 2. DISCUSSION OF THE TEST PROTOCOL 3. DISCUSSION OF EMAT CONTRACTORS' PERFORMANCE 4. SUMMARY AND CONCLUSIONS 5. RECOMMENDATIONS 6. ACKNOWLEDGMENTS ABSTRACT The petrochemical and chemical process industry utilizes a large ...

NDT.net - December 1999, Vol. 4 No. 12 Ultrasonic Air-Coupled Inspection of Advanced Material Jan O. Strycek and Hanspeter Loertscher QMI Inc., 919 Sunset Drive, Costa Mesa, CA 92627 Corresponding Author Contact: Email:sales@qmi-inc.com, Web: http://www.qmi-inc.com TABLE OF CONTENTS Introduction Transducers and Configurations Lateral Resolution Frequency Dependent Transmission C-Scanning of Foam ...

Ultrasound Return to the Table of Contents. Hazard Analysis of Phacoemulsification Key words: ultrasound, cataracts, phacoemulsification Metal particulate is often left in the eye after cataract surgery. The apparent source of the particulate is the surgical tool used to destroy and aspirate the lens. In one million such procedures each year, the tool commonly used is an ultrasound surgical tool ...

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NDT.net - November 1998, Vol. 3 No. 11 Table of Contents ECNDT '98 Session: Ultrasonic Ultrasonic PC- Boards for different Applications Dr.-Ing. W. Hillger, (German Aerospace Center), Institute of Structure Mechanics Lilienthalplatz 7, D-38108 Braunschweig, Germany Telephone +49 531 295-2306, Telefax +49 531 295-2875 Email: Wolfgang.Hillger@t-online.de TABLE OF CONTENTS Abstract Introduction ...

Home Table of Contents Methods and Instrumentation Air-coupled Ultrasound - A Millennial Review Joe Buckley Sonatest Plc Contact Abstract During the last decade Air coupled Ultrasonics has advanced from being a laboratory curiosity, of little practical application, to a point where it is a viable technique for many manufacturing inspections. With appropriate equipment it is possible to perform ...

Home Table of Contents Materials Characterization and testing Characterization of ceramic coatings with large-aperture low-frequency transducers Pentti Kauppinen, Harri Jeskanen and Jorma Pitkanen VTT Manufacturing Technology FINLAND Contact Abstract Thermally sprayed ceramic coatings are widely used in industrial applications where the coated component is subject to, e.g., high thermal loads or ...

Ultrasonic Flowmeter Basics Doppler and transit-time flowmeters are gaining ground in liquid, and in some instances gas, flow measurement applications. Understanding how they work will help guarantee optimum performance. John Flood, Krohne America, Inc. Users and designers of flow metering systems can profit by keeping abreast of new developments. The ultrasonic flowmeter, a recent arrival on ...

Fingerprint structure imaging based on an ultrasound camera This paper describes the design of an ultrasonic camera for the near surface structure observation. The work described herein is the effect of many years of research and development at Optel Ltd. The members of the R&D team are: Wies aw Bicz*, Dariusz Banasiak**, Pawe Bruciak, Zbigniew Gumienny***, Stanis aw Gumuli ski, Dariusz Kosz, ...

Ultrasound Imaging and Tomography Research A Novel Technique of Ultrasonic Imaging of Smoldering Combustion These movies show the evolution of the permeability (left) and temperature (right) as a smolder wave penetrates into a cylindrical polyurethane foam fuel sample. The permeability is taken as a line of sight average and transformed, assuming axisymmetry, using the Abel transform. The ...

Patents for Ultrasonics - MEASURING AND TESTING - US Class 73 What follows are the titles to MEASURING AND TESTING patents issued in 1995-1996 dealing with Ultrasonic. To obtain the abstract to any of these patents, you can connect to the PTO's patent abstract retrieval Web page. There you will find a query box. To retrieve a patent abstract, use the following query string: PN/XXXXXXX where ...

Ultrasonic Terms Absolute error - The difference between a measurement and ites true value. We must estimate the true value so this is often expressed with confidence intervals. Acoustic Ohm - Unit of acoustic resistance. An acoustic impedance is one ohm (cgs) when a sound pressure of 1 microbar produces a volume velocity of 1 cubic cm per second. Used mostly in resonator applications and not ...

A Thick-Film Acoustic Wave Sensor N. M. White (c) University of Southampton 1994 Contents Introduction The acoustic wave sensor Circuit design Experimental results and discussion Conclusion References 1. Introduction Acoustic wave sensors offer advantages of high sensitivity, good linearity, low hysteresis and wide versatility. Their main use is in the higher cost, precision areas. Low-cost, ...

Is Calibration Necessary Robert A. Day Second Sound 904 Cortland Avenue San Francisco, CA 94550 (415) 641-4947 (415) 641-5502 Fax rocky@xdcr.com Calibration is required by national and international standards and most require that a system of periodic calibration and maintenance must exist for any facility doing nondestructive testing. An example of these requirements is in ASTM E-1212 Standard ...

Blue Wave Ultrasonics, formerly Bendix Ultrasonics and Swen Sonic, is a leading manufacturer of ultrasonic cleaning equipment for industrial and medical parts and precision cleaning applications.

ULTRASONIC FLOWMETERS Types of ultrasonic Flow Meters Visit our website at http://www.eesiflo.com Doppler and transit-time flowmeters are two types of ultrasonic flow meters that have been extensively used in liquid applications around the world, certain companies are now applying the transit time method for gas flow measurement applications either flare gas or custody transfer meters for ...

Ultrasonic non-destructive testing for concrete Facilities for the non-destructive testing of concrete include a PUNDIT (Portable Ultrasonic Non-destruclive Digital Indicating Tester), a Ultro Son! Scope (Marul Model MIN-1 1 05-03) and a Concrete Test Hammer (PROCEO Type N-34). While both the PUNDIT and the Ultra Son! Scope can be used to investigate cracks and voids in concrete, and to estimate ...

FOR PUBLICATION Brite/EuRam project BRE2.CT92.0131 Proposal no: 92-5029 Synthesis Report Report number 9 From 1st June 1993 to 30th September 1996 Ultrasonic resonance spectroscopy quality assurance testing of: concrete, aerospace and die-cast aluminium. A project funded by the European Community under the Brite/EuRam programme Co-ordinator Instrumentation Innovation Ltd - GB Church Farm Barn, ...

Formation of acoustic waves - generation of gaussian waves. The left picture shows the cross-section of the sound field produced with the typical focusing transducer, the right after our wavecorrector was used. befor correction after correction Both pictures was taken, using a small transducer, moving on the spherical path with the center in the center of the wave field. Because the shape of the ...

NDT.net - January 2000, Vol. 5 No. 01 High transduction Piezoelectric transducers and introduction of Non-Contact analysis Mahesh C. Bhardwaj Ultran Laboratories, Inc. 1020 E. Boal Avenue Boalsburg, PA 16827 USA phone: 814.466.6200, fax: 814.466.6847 Corresponding Author Contact: Email: Mcbhardwaj@aol.com, Web: http://www.ultranlabs.com Submitted to the Enclyclopedia of Smart Materials, ed. J.A.

NDTnet - September 1996, Vol.1 No.09 PVDF and Array Transducers Author: Robert A. Day We express our gratitude to the author for contribution most of the HTML formating work. Transducer Workshop Abstract PVDF has become popular in recent years because of it's unique advantages. It is not a panacea however and I will discuss it's advantages and disadvantages relative to other popular materials.

NDTnet - February 1996, Vol.1 No.02 ULTRASONIC PROPERTIES OF A NEW LOW ATTENUATION DRY COUPLANT ELASTOMER by E.A.Ginzel & R.K.Ginzel Home Page of the Author: E.A. Ginzel, Materials Research Institute ABSTRACT Physical properties have been investigated for an new elastomer designed specifically for ultrasonic inspection applications. Unlike dry couplants normally used as an integral part of ...

Bond strength measurement in a three layer sandwich ...

IMASONIC designs ans manufactures ultrasonic piezocomposite transducers for industrial and medical application. Custom and standard products including single element and phased array transducers ...

Home Table of Contents Methods and Instrumentation A Study on the Guided Wave Mode Conversion Using Self-calibrating Technique Cho, Younho Department of Mechanical Engineering, Inje Univ., The Republic of Korea Park, Jung-Chul NDT Engineering Co., The Republic of Korea Joseph L. Rose Engineering Science and Mechanics Dept. Penn State University, USA Derrick D. Hongerholt BFGoodrich Aerospace, ...

Abstract: Towards SAFT-Imaging in Ultrasonic Inspection of Concrete M. Schickert (Martin.Schickert@mfpa.de), Materialforschungs- und prufanstalt (MFPA) at HAB, Weimar (D) Keywords: Concrete, Defect, Imaging, Reconstruction, SAFT, Ultrasound This paper was presented at the International Symposium Non-DestructiveTesting in Civil Engineering (NDT-CE) 26.-28.09.1995 in Berlin. NDT-CE, Full Program ...

NDT.net - November 1999, Vol. 4 No. 11 Acoustoelastic Phenomena of Wood Yasutoshi Sasaki and Kosei Ando Faculty of Agricultural Sciences, Nagoya University Nagoya 464-8601, Japan 5th World Conference on Timber Engineering 1998 August 17-20, Montreaux, Switzerland. Reproduced with the publisher's autorization. 1998, Presses polytechniques et universitaires romandes, Lausanne, Suisse. TABLE OF ...

Home Table of Contents Methods and Instrumentation Adaptive Inspection of Component of Complex Geometry with a Flexible Phased Array Probe S. Mahaut, O. Roy and S. Chatillon, Commissariat l'Energie Atomique, CEA/CEREM, CE Saclay France Contact Abstract Ultrasonic in service inspections of primary and auxiliary circuits of pressurized water reactors are mainly performed with contact transducers.

Home Table of Contents Methods and Instrumentation Advances in Ultrasonic transducer Development H.H.J. Huynen, F.H. Dijkstra, T. Bouma, R ntgen Technische Dienst bv, Rotterdam, The Netherlands H. Wustenberg Bundesanstalt fur Materialforschung und -Prufung, Berlin, Germany Contact Summary: RTD Ultrasonic transducer development is focused on finding solutions for common and new NDT applications.

Home Table of Contents Methods and Instrumentation Application related evaluation of ultrasonic probes Author: Dr. Werner Roye, KRAUTKR MER GmbH & Co. oHG, D - Hurth Co-Author: Udo Schlengermann, KRAUTKR MER GmbH & Co. oHG, D - Hurth Contact 1. Introduction The manifold inspection tasks of the manual as well as the automated nondestructive tests can only be solved reliably, if the ultrasonic ...

NDTnet - May 1997, Vol.2 No.05 Approximative Modeling for the Practical Application at Ultrasonic Inspections H.Wustenberg, A.Erhard * Presented on the Application Workshop in May '97 ABSTRACT Table of contents Introduction An approximative model for the ultrasonic inspection The model on a separat page! Practical applications and experimental veriffication of the model 4.1 Inclined notches 4.2 ...

NDTnet - September 1996, Vol.1 No.09 High Temperature Ultrasonic Transducers Authors H. Mrasek, D. Gohlke, K. Matthies, E. Neumann, BAM, Berlin Deutsch Die englische Version ist vollstandiger Transducer Workshop Contents Development of Prototype Devices 1. Literature Survey 2. Reference Set Up 3. Ultrasonic Probe Components 4. Prototype Ultrasonic Probe Test of Materials in Devices References ...

Home Table of Contents Industrial Plants and Structures Lamb and SH Wave Transducer Arrays for the Inspection of Large Areas of Thick Plates P.Wilcox, M.Lowe, P.Cawley Department of Mechanical Engineering, Imperial College London SW7 2BX, UK Contact SUMMARY The motivation for this work is to develop a guided wave system to inspect a large area of a thick (5-25 mm) plate structure from a single ...

NDTnet WCNDT '96 - New Delhi Table of Contents Ultrasonic Testing - Mechanical Properties LONGITUDINAL ULTRASONIC VELOCITY AS A PREDICTOR OF MATERIAL PROPERTIES OF POROUS MATERIALS Jose P. Panakkal Advanced Fuel Fabrication Facility, Bhabha Atomic Research Centre, Tarapur, India 401 502 Keywords: NDT, ultrasonic velocity, material properties, characterization ABSTRACT Use of ultrasonics for ...

Home Table of Contents Materials Characterization and testing Material Characterisation Probe Harri Jeskanen, Pentti Kauppinen, Jorma Pitkanen and Seppo Tahtinen VTT Manufacturing Technology FINLAND Contact INTRODUCTION Surface (Rayleigh-waves) and leaky-Rayleigh waves are widely used in acoustic microscopy to characterize different materials and thin surface films and coatings. Much less is ...

Home Table of Contents Methods and Instrumentation New Equipment for Ultrasonic Testing of Heavy Plates - 100% coverage of Plate Body with Additional 100% Testing of the Plate Edges Hans-Jurgen Bathmann, Klaus Grumbach, Dr. Jens Schr der, Hans Siegel Contact Preliminary Remark The plate mill of Mannesmannr hren-Werke at Mulheim an der Ruhr is one of the most performant plate mills in Europe, its ...

NDT.net - February 2000, Vol. 5 No. 02 On Design of Ultrasonic Transducers and Accuracy of Velocity Measurements Nesvijski E. G. Center of Technology, UFSM, Santa Maria, RS, Brazil Corresponding Author Contact: Email: edouard@w3.ufsm.br, Web: http://w3.ufsm.br/edouard/ TABLE OF CONTENTS Introduction Analysis of standard approaches Practical tasks Calculation examples Conclusions Introduction ...

NDT.net - September 2000, Vol. 5 No. 09 On a Possibility of Rayleigh Transformed Sub-Surface Waves Propagation E. G. Nesvijski Center of Technology, Federal University of Santa Maria Campus Universitario, Santa Maria, RS 97110-970, Brazil Corresponding Author Contact: Email: edouard@w3.ufsm.br, Web: http://w3.ufsm.br/edouard/ TABLE OF CONTENTS Abstract Introduction Theoretical Background ...

NDTnet - September 1996, Vol.1 No.09 Piezoelectric materials for ultrasonic probes Authors: M. Lach, M. Platte, A. Ries Transducer Workshop Abstract A series of powerful piezoelectric materials are available to generate ultrasound in ultrasonic probes. These materials differ in their physical properties. Depending on the application and the required probe characteristics, the one or the other ...

NDT.net - September 2000, Vol. 5 No. 09 Piezoelectric Materials, Ultrasound Transducers and Arrays Characterisation by Laser Interferometry. N. Felix VERMON, 180, rue du General Renault, BP 3813, 37038 Tours Cedex-FRANCE GIP Ultrasons / L.U.S.S.I, BP 3223, 37032 Tours Cedex-FRANCE D. Certon, F. Patat and M. Lethiecq GIP Ultrasons / L.U.S.S.I, BP 3223, 37032 Tours Cedex-FRANCE Corresponding ...

Home Table of Contents Methods and Instrumentation Principle and Applications of Practical Shear Wave Lens at Low frequencies for Scanning Acoustic Microscopy Chiaki MIYASAKA, and Bernhard R. TITTMANN Department of Engineering Science & Mechanics The Pennsylvania State University 212 Earth and Engineering Science Building, University Park, PA 16802, USA Contact Abstract Ever since the invention ...

NDT.net - September 1998, Vol.3 No.9 Table of Contents ECNDT '98 Session: Aerospace REVIEW OF ADVANCED ULTRASONIC TECHNIQUES FOR AEROSPACE STRUCTURES Herv&#233 TR&#201TOUT* *Corresponding Author Contact: DASSAULT AVIATION - CDE, BP12, Z.A. Louis Br&#233guet, F-78141 Velizy, France ; DASSAULT_CDE@compuserve.com TABLE OF CONTENTS Introduction Acoustical Interferometry Laser BasedUltraSounds (LBU) ...

Home Table of Contents Methods and Instrumentation Scanning Modes at the Application of Ultrasonic Phased Array Inspection Systems Authors: H. Wustenberg, A. Erhard, G. Schenk Contact 1. INTRODUCTION The first applications of phased array probes in NDT tried to imitate the successful medical ultrasonic diagnostic with phased array scanning systems. But due to the many differences between medical ...

Home Table of Contents Methods and Instrumentation Simulation of Voltage Waveform Converted from Sound Pressure in Ultrasonic Test Yoshio UDAGAWA Imaging Supersonic Laboratories Co., Ltd. 12-7 Tezukayamanakamachi Nara Japan 6310063 Osami KOBORI Osaka Sangyo University 3-1-1 Nakagaito Daito-Shi Japan 5748530 Contact Abstract Transducer in ultrasonic test is used to generate wave, sends sound ...

NDT.net - April 1999, Vol. 4 No. 4 Some Characteristic Parameters of Ultrasonic Phased Array Probes and Equipments H. W&#252stenberg, A. Erhard, G. Schenk BAM - Berlin Corresponding Author Contact: Email: Hermann.Wuestenberg@bam.de TABLE OF CONTENTS Introduction Probe related parameters Equipment related parameters Specialized methods for the probe parameters Specialized methods for the ...

Home Table of Contents Methods and Instrumentation The Development and Application of Single Crystal Creeping Wave Probe with Line-focusing Zheng Kaisheng, Chen Yucheng Baoji Non-ferrous Metals Works, Baoji 721014 Peng Yingqiu Nanchang Institute of Aeronautica Technology, Nanchang 330034 Contact ABSTRACT The relevant wave-modes and mechanisms generated by creeping wave probe are analyzed and ...

NDTnet - August 1997, Vol.2 No.08 Ultrasonic beams focusing in piezoelectric crystals and ferroelectric ceramics by application of a nonuniform electric field Authors: V.N.Belyi, N.S.Kazak V.K.Pavlenko, A.G.Mashchenko and F.M.Severin Abstract A new solution to the problem of controllable focusing of ultrasonic beams is given. It consists in that the application of a nonuniform electric field of ...

Home Table of Contents General Ultrasonic flow detection for small and medium diameter pipe bends Author: Shao-he Song (senior electrical engineer) Adress: Boiler Inspection Office, Gansu Electric Powere Test & Research Institute Gansu Province, China Co-Author: Xin Zhang ( electrical engineer) Adress: Boiler Inspection Office, Gansu Electric Powere Test & Research Institute Gansu Province, ...

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 Abstracts Objectives Scope of work Laboratory tests Detecting artificial and natural defects Grain noise suppression Background, Signal Processing Procedure Beam-forming of ...

Home Table of Contents Methods and Instrumentation Ultrasonic Testing Using a Unipolar Pulse Y. Udagawa Imaging Supersonic Laboratories Co., Ltd. 12-7 Tezukayamanakamachi Nara Japan 6310063 T. Shiraiwa Krautkramer Japan Co., Ltd. 9-29 Sumida 1-chome Higashiosaka Japan 5780912 Contact 1. Abstract Characteristics and advantage of ultrasonic testing using a unipolar pulse, which has plus amplitude ...

NDTnet - August 1996, Vol.1 No.08 STROBOSCOPIC VISUALIZATION OF ULTRASONIC FIELDS ON SOLIDS BY SAMPLING Author Bernd K hler German 1. Abstract There are a number of models for sound field calculations. They include analytical, partly analytical and numerical methods . As far as they refer to sound fields of pulsed sources, their results are often given in so called snapshots, i.e. images of ...