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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of CVD Diamond Coating Using Back-Reflected Rayleigh Surface Wave (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 110 (Mar. 2006), p. 117-122 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The propagation characteristics of the back-reflected Rayleigh surface wave in chemical vapor deposit (CVD) diamond coated specimens were investigated experimentally using the ultrasonic backward radiation measurement. The deliberated delaminations produced between the coating layer and the substrate decreased Rayleigh surface wave velocity. This initial experimentalresult obtained in the present study demonstrates the high potential of the backward radiated ultrasound as a tool for nondestructive evaluation of very thin CVD diamond coating layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.110.117.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Calculation of Radiation Beam Field from Phased Array Ultrasonic Transducers Using Expanded Multi-Gaussian Beam Model (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 110 (Mar. 2006), p. 163-168 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: For the reliable application of ultrasonic phased array technique, it is necessary tounderstand the characteristics of the radiation beam field from the array transducers quantitatively. Very recently, it has been developed the expanded multi-Gaussian beam model that can calculate the radiation beam field from a single, rectangular transducer with great computational efficiency. In thispaper, this model is adopted to calculate the radiation beam field from array transducers with various time delays to achieve steering and/or focusing. The calculation results are compared to those obtained by well known Rayleigh-Sommerfeld integral that provides the exact solution in order to explore the validity of the expanded multi-Gaussian beam model in this task
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.110.163.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Development of a Manipulator Free Mobile Ultrasonic C-Scan System (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1293-1296 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ultrasonic C-scan inspections have been used in various industrial fields. Usually,conventional ultrasonic C-scan systems have several mechanical manipulating axis controlled by acomputer or an electronic device. These systems are suitable for the high resolution and inspectionquality. But they are too heavy and bulky to carry in general, and many industrial fields do not requirehigher resolution than a hundred micron order. To take care of such a need, in this study we developedan ultrasonic C-scan system that does not have any mechanical manipulator to transport ultrasonictransducers. This system, named "M-Scanner", adopts an electro-magnetic position tracking sensorinstead of mechanical manipulating axes in order to trace the transducer position. Furthermore, thisnew system is portable and has a reasonable construction cost along with practical inspectionresolution required in many industrial field inspections
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1293.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Nondestructive Evaluation of Titanium-Nitride Ceramic Coatings (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 465-468 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Titanium-nitride (TiN) ceramic coatings are widely utilized to extend the lifetime of mechanical parts underseverely abrasive conditions and in lubrication environment. Since ceramic layers coated on machinery componentsinevitably experience the changes in their properties, it is necessary to evaluate the characteristics of ceramic coating layersnondestructively for the reliable use of coated components and the remaining life prediction. For this purpose, in thepresent study, the ultrasonic backward radiation technique is applied to evaluate very thin TiN ceramic layers coated onAISI 1045 steel and austenitic 304 steel substrates. In this study, very interesting behaviors are revealed from theinterrogated TiN ceramic coated specimens. The sliding loading in the abrasive wear regime increases the peak amplitudeof the profile. However, the sliding loading large enough to produce scuffing finally decreases the peak amplitude of theprofile while the peak angle increases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.465.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Inspecting Carbon Matrix Composites with Airborne/Conventional Ultrasound (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1789-1792 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Carbon/phenolic composite (CPC) materials have obvious advantages over conventionalmaterials, which are consisting of carbon fibers embedded in a carbon matrix. The CPCs havebecome to be utilized as parts of aerospace applications and its low density, high thermalconductivity and excellent mechanical properties at elevated temperatures make it an ideal materialfor aircraft brake disks. Because of permeation of coupling medium such as water, it is desirable toperform contact-less nondestructive evaluation to assess material properties and part homogeneity.In this work, a C/P(Carbon/phenolic) composite material was characterized with non-contact andcontact ultrasonic methods using automated acquisition scanner. Also through transmission modewas performed because of the main limitation for air-coupled transducers, which is the acousticimpedance mismatch between most materials and air. Especially ultrasonic images and velocitiesfor C/C(Carbon/Carbon) composite disk brake was measured and found to be consistent to somedegree with the non-contact and contact ultrasonic measurement methods. Low frequency throughtransmissionscans based on both amplitude and time-of-flight of the ultrasonic pulse were used formapping out the material property inhomogeneity. Measured results were compared with thoseobtained by the motorized system with using dry-coupling ultrasonics and through transmissionmethod in immersion. Finally, results using a proposed peak-delay measurement method wellcorresponded to ultrasonic velocities of the pulse overlap method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1789.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Nondestructive Evaluation of CVD Diamond Coating Layers Using the Leaky Rayleigh Surface Wave (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 701-704 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Chemical vapor deposit (CVD) diamond coating layer is expected to extend the lifetime ofmechanical parts that are used severely abrasive conditions. However, one of the most severeproblems is that the delamination between the CVD diamond coating layer and the silicon substrateoccurs frequently due to large difference in the material properties. Therefore, the nondestructiveevaluation of adhesive property of CVD diamond coating layer is needed. To address such a need,back-scattered Rayleigh surface wave is currently applied. However, the interpretation of the acquiredsignal is not easy at all. To take care of such a difficulty, we proposed the time trace angular scan(TTAS) plot and the frequency spectrum angular scan (FSAS) plot that can make possible of thesystematic interpretation of the back-scattered signals from the diamond coating layer. In this paper,the concept of the TTAS and FSAS plots and the experimental results presented to demonstrate theeffectiveness of the proposed approach
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.701.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction of Motorized Rotating Pancake Coil Probe Signals Simulated by Numerical Analysis in SG Tubes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 493-496 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Signals acquired from a Combo calibration standard tube used to calibrate for inspectionand evaluation of motorized rotating pancake coil probe signals from steam generator tubes. So,Combo tube signals should be consistent and accurate since they have strong influence on evaluationprocedure of signals. However, motorized rotating pancake coil probe signals are very easily affectedby various factors so that they can distort amplitudes and phase angles which are quantitative termsfor signal evaluation. To overcome this problem, we explored possibility of using numericalsimulation as a practical calibration tool for the evaluation of real field signals. In this study, weinvestigated the characteristics of a motorized rotating pancake coil probe and a Combo tube. Andthen we used commercial software to produce a set of calibration signals and compared to theexperiments. Using simulated Combo tube signals, we evaluated deliberated single circumferentialindication defects, and these results were compared with experimental signal evaluation results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.493.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Enhancement of Ultrasonic C-Scan Images for Inspection of Multi-Layered Composite Panels (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 713-716 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: One of the serious problems that make the flaw identification in a multi-layered thickcomposite panel more difficult is the interference effect of the upper layer. To take care of such aproblem, here we propose an image enhancement approach that can get rid of such an interferenceeffect to ultrasonic C-scan images by a normalization of the acquired signals by a reference signals,and demonstrate its performance in the experiments. Specifically, three specimens with artificialflaws are prepared and ultrasonic C-scan images are acquired experimentally to eliminate theundesired interference effect. Great successes are observed in the present study demonstrating thehigh potential of the proposed algorithm as a practical image enhancement tool in many practicalsituations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.713.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Enhancement of Flaw Detectability Using Time Reversal Techniques (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 120 (Feb. 2007), p. 113-118 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Ultrasonic phased array inspection has been paid a great attention in ultrasonicnondestructive evaluation since it can provide a benefit of focusing and/or steering ultrasonicbeams. A time reversal technique is claimed to be very robust to focus beams throughinhomogeneous media, using the phased array transducers. In this paper, the performance andlimitations of a D.O.R.T. method, which is one of the time reversal techniques, is considered basedon the experimental studies. In addition, a variation of the D.O.R.T, namely a pre-focusedD.O.R.T., is proposed in order to overcome the limitations of the current D.O.R.T. method. Theresults of the newly proposed method are compared to those obtained by conventional focusingmethods
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.120.113.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Nondestructive Evaluation of Rayleigh Pitch-Catch Contact Ultrasound Waves on Impacted-Damaged Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 566 (Nov. 2007), p. 267-272 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In particular, CFRP (carbon fiber reinforced plastics) composite materials have foundwide applicability because of their inherent design flexibility and improved material properties.CFRP composites were manufactured from uni-direction prepreg sheet in this paper. However,impacted composite structures have 50-75% less strength than undamaged structures. It is desirableto perform nondestructive evaluation to assess material properties and part defect in order to ensureproduct quality and structural integrity of CFRP. In this work, a CFRP composite material wasnondestructively characterized and a pitch-catch technique was developed to measure impacteddamagedarea using an automated-data acquisition system. Also one-sided mode was performed toscan defect both manual contact measurement and an immersion tank. It is found a pitch-catchsignal was found to be more sensitive than normal incidence backwall echo of longitudinal wave tosubtle flaw conditions in the composite, including fiber orientation, low level porosity, ply waviness,and cracks. The paper describes the depth of the sampling volume with the head-to-head miniatureRayleigh probes and also ultrasonic C-scan images are acquired experimentally using one-sidedmeasurement and a conventional scanner
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.566.267.pdf
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