Results 121 to 130 of about 252 (152)
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Mathematical morphology for TOFD image analysis and automatic crack detection
Ultrasonics, 2014The aim of this work is to automate the interpretation of ultrasonic images during the non-destructive testing (NDT) technique called time-of-flight diffraction (TOFD) to aid in decision making. In this paper, the mathematical morphology approach is used to extract relevant pixels corresponding to the presence of a discontinuity, and a pattern ...
Thouraya, Merazi-Meksen +2 more
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Applicability of Referent Blocks for TOFD Methods
1997TOFD is to be applied for flaw sizing and characterization whenever it is possible, having essential advantage over conventional UT methods and accuracy much higher than the other UT methods. The primary application starting point is to demonstrate the capability of chosen UT system to be adjusted for TOFD in reproducible way.
Leljak, Irena, Krstelj, Vjera
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The Realization of Portable Ultrasonic TOFD Imaging and Detecting System
Advanced Materials Research, 2013This paper introduced the design of a portable ultrasonic TOFD imaging and detecting system, and developed the hardware and application software based on embedded system. We accomplished multi-channel ultrasonic transmission and acquisition, real time A-scan signal or TOFD image display, ultrasonic data storage and analysis of large capacity and ...
Si Yuan Wang, Xing Qun Zhao, Ling Xia
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The Use of TOFD for Enhancement of HDPE Pipe Fusion Inspection
Volume 4: Codes, Standards, Licensing and Regulatory Issues; Student Paper Competition, 2009HDPE piping has been historically used in place of steels in petrochemical, power, and mining industries to mitigate corrosion and erosion issues. Additionally as HDPE pipe is resistant to Microbiologically Influenced Corrosion (MIC) and fouling, it appears to be a perfect fit for nuclear safety related cooling water applications. To this end, HDPE was
Clayton T. Smith +2 more
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L51815 The Development of a TOFD Image Reference Collection
1997The Time Of Flight Diffraction (TOFD) Technique is rapidly gaining importance as a reliable NDT technique for weld inspection, capable of both detection and sizing of defects. The acquisition of TOFD inspection data is fast and straightforward; the crucial step in inspection reliability is therefore its interpretation. A reliable interpretation of TOFD
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Analysis the Results of TOFD Inspection in Butt Joint Welds
Applied Mechanics and Materials, 2012In the application of the TOFD inspection method, the analysis of test results is the focus and aporia of the study. TOFD image analysis include: analysis of defect size, location analysis and defect map features. In order to increase people's understanding of the TOFD technique, given butt joint welds TOFD and RT detect.
Peng Lin Zhang, Juan Dong, Li Cao
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Обработка TOFD-эхосигналов с целью достижения сверхразрешения
Дефектоскопия, 2021The paper proposes to use the method of maximum entropy (ME) and the method for constructing an AR model of the TOFD echo spectrum together with the method of splitting spectra to increase the resolution and, consequently, its information content. Model experiments have shown the effectiveness of the proposed approach.
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Advantages and Limitations of TOFD Technique in Casting Inspection
2000In service inspection (ISI) of aged power plant parts has a delicate task to provide information on presence, position, orientation and size of defects in material. As far as results of ISI are just a starting point for elaborate procedure of life assessment or risk analyses, the accuracy and reliability of these results are particularly important ...
Dukić, Ines, Dukić, Predrag
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Research and Realization of Real-Time Ultrasonic TOFD Scan Imaging System
2011This paper introduced the design of ultrasonic TOFD scan imaging system, explained the principle of TOFD, and illustrated the hardware, drivers and application software that are based on embedded system. With high-speed AD conversion and data acquisition driver, the system realized multi-channel ultrasound emission, high-speed data acquisition, real ...
Di Tang, Xingqun Zhao, Ling Xia
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A metrological approach to the time of flight diffraction method (ToFD)
Measurement: Journal of the International Measurement Confederation, 2021R P B Costa-Félix
exaly