Enhancing Time-of-Flight Diffraction (TOFD) Inspection through an Innovative Curved-Sole Probe Design [PDF]
SensorsTime-of-Flight Diffraction (TOFD) is a method of ultrasonic testing (UT) that is widely established as a non-destructive technique (NDT) mainly used for the inspection of welds.
Irati Sanchez Duo +3 more
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Using phase relationships in non-symmetric ToFD configurations
e-Journal of Nondestructive Testing, 2023 In conventional ToFD, operators are taught that diffracted echoes from the top and bottom of a planar defect have opposite phase and such defects can thus be discriminated from a pair of slag lines.
Thomas Joseph Bloodworth +1 more
doaj +3 more sources
CIVA Confirmation of Frequency Dependence of TOFD Lateral Wave
e-Journal of Nondestructive TestingPulse-duration (ring-time) of the TOFD (Time of Flight Diffraction) lateral wave has been assumed to be based on the nominal frequency of the probe. With the improved damping used for TOFD applications, these probes now have had their ring-time reduced ...
Edward Ginzel, Edward Ginzel
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Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects [PDF]
Sensors, 2021 Time of flight diffraction (TOFD) is considered a reliable non-destructive testing method for the inspection of welds using a pair of single-element probes.
Baptiste Gauthier +3 more
doaj +2 more sources
Ultrasonic Time-of-Flight Diffraction Imaging Enhancement for Pipeline Girth Weld Testing via Time-Domain Sparse Deconvolution and Frequency-Domain Synthetic Aperture Focusing [PDF]
SensorsUltrasonic TOFD imaging, as an important non-destructive testing method, has a wide range of applications in pipeline girth weld inspection and testing.
Eryong Wu +4 more
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A Study on Determining Time-Of-Flight Difference of Overlapping Ultrasonic Signal: Wave-Transform Network [PDF]
Sensors, 2020 An ultrasonic sensors system is commonly used to measure the wall thickness of buried pipelines in the transportation of oil and gas. The key of the system is to precisely measure time-of-flight difference (TOFD) produced by the reflection of ultrasonic ...
Zhipeng Li +6 more
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Broadband and High Sensitive Time-of-Flight Diffraction Ultrasonic Transducers Based on PMNT/Epoxy 1–3 Piezoelectric Composite [PDF]
Sensors, 2015 5–6 MHz PMNT/epoxy 1–3 composites were prepared by a modified dice-and-fill method. They exhibit excellent properties for ultrasonic transducer applications, such as ultrahigh thickness electromechanical coupling coefficient kt (85.7%), large ...
Dongxu Liu +8 more
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Revista EIA, 2012 This paper shows how the symbiosis of two disciplines, software engineering and ultrasonic techniques, made possible the development of a nondestructive testing system for TOFD imaging, and it also allowed to make the application of commercial ...
Darío Segura, Alejandro Rodríguez
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The Maximum Entropy Method in Ultrasonic Non-Destructive Testing—Increasing the Resolution, Image Noise Reduction and Echo Acquisition Rate [PDF]
Entropy, 2018 The use of linear methods, for example, the Combined Synthetic Aperture Focusing Technique (C–SAFT), does not allow one to obtain images with high resolution and low noise, especially structural noise in all cases. Non-linear methods should improve
Evgeny Gennadievich Bazulin
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A Novel Method for Ultrasonic Evaluation of Horizontal Defects Using Time-of-Flight Diffraction [PDF]
Iranian Journal of Oil & Gas Science and Technology, 2014 Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves.
Parastoo Bagheri +3 more
doaj +1 more source