Cordis Publications 1995 - 1st.March 1996

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The RTD-PUBLICATIONS database contains : 69589 records

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(11) ULTRASONIC 241
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Record No. 1 of 13
Title : FINITE AMPLITUDE NEAR-FIELD MODELLING OF ULTRASONIC FIELDS USING A TRANSFER MATRIX FORMULATION
AU : MAKAROV S N
AF : PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (DE)
RF : REPORT: PTB-MA-42 EN (1995) 64PP. AVAILABLE FROM PHYSIKALISCH TECHNISCHE BUNDESANSTALT, BUNDESALLEE 100, 38116 BRAUNSCHWEIG (DE)
Abstract : In modern ultrasonic equipment as used in medical diagnostics (and particuarly for lithotripters), the nonlinear effects play an important role. In a number of devices, they considerably affect the measured characteristics of the ultrasonic field and are therefore worth studying in detail. In its present form, the method models the propagation of steady state ultrasonic fields in a thermoviscous fluid. The acoustic field is propagated along the axis of symmetry with substeps that acount for diffraction, attenuation, and nonlinearity. The diffraction substep involves the use of the Helmoltz-Huyghens integral for the pressure applied to equally spaced planes which are perpendicular to the axis of symmetry. Implementation of this integral for two arbitrary consecutive reference planes leads to a transfer matrix size which does not depend on the specific problem. The nonlinear and attenuation substeps are based on the frequency domain solution of the Burgers equation. The method is tested by comparion with exact solutions in the two limiting cases of linear diffraction and nonlinear plane wave propagation. A comparison with measurements performed on the nonlinear field of a focussed 1.0 MHz source is given.

Record No. 2 of 13
Title : CREEP DAMAGE DETERMINATION BY NON-DESTRUCTIVE TECHNIQUES AND QUANTITATIVE METALLOGRAPHY
AU : SCHOLTZ R; SCHWERTEL J
AF : JRC ISPRA (IT); JRC ISPRA (IT)
RF : PAPER PRESENTED: EUROMAT 95, PADOVA (IT) AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 39388 ORA
Abstract : Ultrasonic techniques (US) and electrical resistivity (RE) measurements were applied to determine the creep damage in 3 austenitic stainless steels having different creep characteristics. In addition, the specimens were investigated metallographically. In this case the A-parameter was used to quantify the damage. The results of the US and RE measurements and their comparison to the metallographic examination show that both techniques may be used for creep damage characterization in all 3 materials despite the different mechanisms of damage formation observed. There is a closer agreement between the RE measurements and

Record No. 3 of 13
RCN : 199511626
QVD : 1995-12-12
UPD : 1996-02-20
Title : IMPROVING STRUCTURAL PROPERTIES OF METAL/METAL BONDING BY ACOUSTIC EMISSION MONITORING AND ULTRASONIC INSPECTION
AU : CALABRO A; SANTULLI C
AF : CIRA, CAPUA (IT); JRC ISPRA (IT)
RF : PAPER PRESENTED: MATERIALS AGEING AND LIFE EXTENSION, MILAN (IT), OCTOBER 10-12, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 39338 ORA
Abstract : This work aims to supply some indications to improve the bonding cycle properties of metal/metal joints by correlating in process-acoustic emission (AE) data features with ultrasonic C-scan maps of bonded joints. Mechanical energy coming from interfacial bonding and modified epoxy polymerisation leads to characteristics and different AE graphs, and effective structural coverage of the surface gives different ultrasonic C-scan images at the interface. The two ways of investigating this structure can be correlated so as to discern well produced joints from any other joint presenting any cohesive problem.

Record No. 4 of 13
RCN : 199511239
QVD : 1995-10-13
UPD : 1995-10-24
Title : NONDESTRUCTIVE TESTING POTENTIAL OF A MAGNETOACOUSTIC STORAGE CORRELATOR (MASC)
AU : ERMOLOV V; OKSANEN M; LUUKKALA M
AF : MOSCOW ENGINEERING PHYSICS INSTITUTE (RU); JRC ISPRA (IT); UNIVERSITY OF HELSINKI, DEPARTMENT OF PHYSICS (FI)
RF : PAPER PRESENTED: QNDE, 22ND ANNUAL REVIEW OF PROGRESS IN
QUANTITATIVE NONDESTRUCTIVE EVALUATION, SEATTLE (US), JULY 30 - AUGUST 4, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 39221 ORA
Abstract : The MASC offers a capability similar to ultrasonic memory correlators. The device is very easy to construct, operates naturally at the frequency range of the normal ultrasonic testing devices and potentially offers a very high pulse compression ratio, in the range of millions. However some aspects such as noise dynamic range, linearity and spurious responses due to reflections need to be studied before final applications can be foreseen. The research is continuing to clarify these aspects as well as the different material choices for the magnetoacoustically active rod. Other systems such as surface and string wave magnetoacoustic correlation devices are being considered.

Record No. 5 of 13
RCN : 199511107
QVD : 1995-08-22
UPD : 1995-11-22
Title : IN-SERVICE INSPECTIONS AND SURVEILLANCE PROGRAMME OF THE VESSEL OF THE HIGH FLUX REACTOR PETTEN
AU : BIETH M
AF : JRC PETTEN (NL)
RF : PAPER PRESENTED: TOPICAL SEMINAR ON MANAGEMENT OF AGEING OF RESEARCH REACTORS, GEESHACHT, HAMBURG (DE), MAY 8-12, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 39118
Abstract : When the aluminium reactor vessel of the HFR Petten was replaced in 1984, a new design philosophy was agreed with the licensing authorities, that the reactor can only be operated if it can be demonstrated that the vessel contains no critical defect. The inspection programme includes ultrasonic, eddy current, liquid penetrant, dimensional and visual testing. In-service inspections every three years have shown no change in the new vessel since installation. A new irradiation damage surveillance programme has been started (in 1985) for the new vessel material to provide information on fracture mechanics properties. Compact tension and tensile specimens have been placed in an in-core position and a pool side facility (PSF) position for the proper simulation of the neutron flux conditions of the different walls of the core box. The specimens are scheduled to be removed from irradiation and tested at different intervals of the

Record No. 6 of 13
RCN : 199510963
QVD : 1995-08-10
UPD : 1995-10-24
Title : APPLICATION OF ULTRASONIC RAYLEIGH WAVES TO THE THICKNESS MEASUREMENT OF METALLIC COATINGS
AU : LAKESTANI F; COSTE J-F; DENIS R
AF : JRC ISPRA (IT); JRC ISPRA (IT); JRC ISPRA (IT)
RF : ARTICLE: NDT & E INTERNATIONAL
Abstract : This article presents a study of some aspects of the use of ultrasonic surface waves for inspection of coated components. The elastic characteristics of the coating and of the substrate materials were measured using a transmission method for parallel-faced plates. The velocity of the shear and compression waves propagating in various directions was obtained by changing the angle of incidence on the

Record No. 7 of 13
RCN : 199510718
QVD : 1995-07-07
UPD : 1995-09-12
Title : NON-DESTRUCTIVE THICKNESS DETERMINATION OF METALLIC COATINGS USING ULTRASONIC LEAKY RAYLEIGH WAVES
AU : COSTE J F; LAKESTANI F; VORTREFFLICH W J
AF : JRC ISPRA (IT); JRC ISPRA (IT); JRC ISPRA (IT)
RF : PAPER PRESENTED: 7TH INTERNATIONAL SYMPOSIUM ON NON-DESTRUCTIVE CHARACTERISATION OF MATERIALS, PRAGUE (CS), JUNE 19-23, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 38985 ORA
Abstract : This paper presents a non-destructive method based on the measurement of ultrasonic Leaky Rayleigh waves characteristics (velocity and attenuation) for the thickness measurement of vacuum plasma sprayed (VPS) NiCoCrAlY coatings deposited on AISI316L and Ni-based substrates which are used to protect gas turbine blades against high temperature corrosion and erosion phenomena. The ultrasonic technique used is based on the measurement of an acoustic signature (the so-called v(z)-curve) of the coated specimen. Two highly-damped flat transducers (one working as a transmitter, the other as a receiver) are translated along a z-axis, perpendicular to the sample surface. The sample is immersed in water. For each height z of the transducer, the received signal is digitised and Fourier transformed. Thus, for each frequency, complex v (z)-curves are obtained. By choosing the dimensions of the beam appropriately, the height z and the frequency, the variations of the amplitude and of the phase allow the measurement of the thickness. The method was applied to different substrates coated by a NiCoCrAlY layer with the thickness ranging from 60 to 330 micron. The ultrasonic layer thickness was then successfully correlated to the one optically

Record No. 8 of 13
RCN : 199510712
QVD : 1995-07-07
UPD : 1995-09-12
Title : ULTRASONIC TESTING OF PLASMA SPRAYED COATINGS WITH ARTIFICIAL BONDING FLAWS USING FOCUSED RAYLEIGH WAVES
AU : LESCRIBAA D; VORTREFFLICH W J; LAKESTANI F
AF : JRC ISPRA (IT); JRC ISPRA (IT); JRC ISPRA (IT)
RF : PAPER PRESENTED: FIRST JOINT BELGIAN-HELLENIC CONFERENCE ON NON-DESTRUCTIVE TESTING, PATRAS (GR), MAY 22-23, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 38979 ORA
Abstract : An ultrasonic method using a broadband transducer with a large angular aperture generating Rayleigh waves is employed for the detection of bonding flaws on NiCoCrAlY plasma sprayed coatings. Artificial defects are realised for setting the distance between the transducer and the sample, in order to optimise the contrast of the C-Scan image.

Record No. 9 of 13
RCN : 199510702
QVD : 1995-07-07
UPD : 1995-09-12
Title : INTERACTIVE REMOTE SURVEILLANCE SYSTEM
AU : GONCALVES J; NUNES J; SANTOS V
AF : JRC ISPRA (IT); JRC ISPRA (IT); UNIVERSITA AVEIRO (PT)
RF : PAPER PRESENTED: ESARDA 17TH ANNUAL SYMPOSIUM ON SAFEGUARDS AND NUCLEAR MATERIAL MANAGEMENT, AACHEN (DE), MAY 9-11, 1995 AVAILABLE FROM EUROPEAN COMMISSION, DGXIII/D-2, L-2920 LUXEMBOURG AS PAPER EN 38969 ORA
Abstract : Remote surveillance is becoming increasingly important in Nuclear Safeguards. Different schemes can be devised depending on specific applications, differing in, for example, the presence or absence of front-end processing, the communication media, and the interactive capabilities. For some time the JRC has been working on the use of mobile robotics for the remote verification (for example, inventory and/or surveillance) of a pilot plant storage area. A mobile robot is equipped with two video cameras mounted on top of computer controlled pan-and-tilt units. The paper concentrates on two aspects of the project: (i) the description of the active vision system (TV camera, pan-and-tilt unit and motorised zoom and focus lens), its hardware and software architectures, and the human-computer interface that was developed; (ii) the use of ultrasonic data for computer aided navigation including obstacle detection and avoidance. The two aspects, though not directly related, cover two key elements for a remote surveillance system: the video surveillance equipment, and the system's ability to navigate safely in a remote environment.

Record No. 10 of 13
RCN : 199510475
QVD : 1995-03-22
UPD : 1995-09-12
Title : INSTALLATION EFFECTS ON MULTI-PATH ULTRASONIC FLOW METERS
AU : WILSON M B
AF : BP INTERNATIONAL LTD., SUNBURY-ON-THAMES (GB)
RF : EUR 16175 EN (1995) 71 PP., MF, ECU 4 OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Abstract : The Ultraflow project was a joint industry project aimed at establishing the installation conditions necessary for multi-path ultrasonic flow meters operating on natural gas at high pressures. An extensive series of tests was performed, at five different test facilities, to demonstrate the effect of upstream disturbances, due to bends, step changes in pipe diameter and pressure reduction, on 6" and 12" meters operating at pressures in the range 10 to 60 bar. An important aspect of the project was the setting up of a separate and independent quality assessment team. The synthesis report on the project includes the results of the tests in both disturbed and ideal conditions. The disturbance test results are presented in the form of the error shift attributable to the disturbance, allowing its effect to be readily appreciated. The error shift ranged from zero for diameter steps to around +/- 3 % for the most extreme case of swirl tested depending on meter size and orientation. Values for the uncertainty due to the presence of various disturbances are proposed, together with the identification of a number of areas where additional work is desirable.

Record No. 11 of 13
RCN : 199510277
QVD : 1995-03-08
UPD : 1995-12-12
Title : HEAT TESTING OF CONTINUOUSLY CAST SLABS BY ELECTROMAGNETIC ULTRASONIC TESTING PROBES
OT : HEISSPRUEFUNG VON STRANGGUSSBRAMMEN MITTELS ELEKTROMAGNETISCHER ULTRASCHALLPRUEFKOEPFE
NT : ABSCHLUSSBERICHT
AU : COEN G; LOST E; OBERHOFF D; LAMPEY H
AF : BETRIEBSFORSCHUNGSINSTITUT, VDEH-INSTITUT FUER ANGEWANDTE FORSCHUNG GMBH, DUESSELDORF (DE);
RF : EUR 15173 DE (1995) 87 PP., FS, ECU 13.50 ISBN 92-826-9513-1 OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Abstract : The problems which remained to be resolved in the hot testing of continuously cast products at the start of the project were the identification of surface defects, subsurface defects and interior defects and the determination of the strand shell thickness and liquid crater depth. The purpose of the project was to develop, build and test an electromagnetic ultrasonic testing system (EMUS-PSY) for use in the steel production process. An operative prototype test system for the detection of edge cracks on slabs with a maximum surface temperature of 600 C was built and tested under field conditions. Flaw detection was achieved by means of electromagnetically generated surface waves (Rayleigh waves). The viability of this process could be validated by means of field tests in the scarfing shop.

Record No. 12 of 13
RCN : 199411584
QVD : 1995-03-21
UPD : 1995-09-12
Title : ROCK MATRIX DIFFUSION AS A MECHANISM FOR RADIONUCLIDE RETARDATION : NATURAL RADIOELEMENT MIGRATION IN RELATION TO THE MICROFRACTOGRAPHY AND PETROPHYSICS OF FRACTURED CRYSTALLINE ROCK
NT : TOPICAL REPORT
AU : HEATH M J ET AL.
AF : UNIVERSITY OF EXETER, EARTH RESOURCES CENTRE (GB)
RF : EUR 15977 EN (1995) 128 PP., FS, ECU 15 ISBN 92-827-0152-2 OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Abstract : Rock matrix diffusion is a potentially important radionuclide retardation mechanism. To predict retardation, mathematical models need data from actual sites. This study aims to provide such data by investigating the petrophysical, microstructural, geochemical and uranium series disequilibrium characteristics of rock adjacent to fractures in El Berrocal granite (Spain). Ultrasonic tests on cores EB4 and EB5 suggest microstructural changes adjacent to fractures. Acoustic microscopy has revealed anisotropy in surface wave velocity in thin sections; fluorescence microscopy has allowed quantification of microcrack orientation which appears anisotropic. Uranium microcartography (fission track analysis and alpha-autoradiography) has revealed three modes of U distribution: (i) dispersed within primary phases; (ii) point sources associated with accessory minerals; (iii) linear distributions associated within microfractures. Uranium series/geochemical work on EB4 has shown a correlation of U mobility with iron oxidation. The EB5 profile shows no chemical U enrichment but the activity ratio suggests recent 234U enrichment. The EB6 profile shows U enrichment on the fracture, but the activity ratios suggest geologically recent U mobilisation in the entire profile.

Record No. 13 of 13
RCN : 199411186
QVD : 1995-03-21
UPD : 1995-11-07
Title : THIN WIRE ULTRASONIC THERMOMETRY FOR MEASURING AXIAL TEMPERATURE PROFILES
AU : TASMAN H A
AF : JRC KARLSRUHE (DE)
RF : EUR 15870 EN (1995) 39 PP., FS, ECU 7 ISBN 92-826-8988-3 OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Abstract : This text summarises experience gained at the Institute of Transuranium Elements over more than twenty years of activity in the field of pulse echo ultrasonic thermometry. It includes references to some of the more outstanding applications in the nuclear field. It discusses the design and test of multiple section sensors for measuring temperature profiles, and a novel operation system, Black Box Mark 3, based on a commercial analogue-to-digital converter and a standard PC.

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Rolf Diederichs 11. March 1996, info@ndt.net