Results 11 to 20 of about 3,511 (220)

CIVA Confirmation of Frequency Dependence of TOFD Lateral Wave

e-Journal of Nondestructive Testing
Pulse-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
doaj   +3 more sources

TOFD Defect Image Recognition Based on YOLOv7

Journal of Physics: Conference Series, 2023
Abstract Welding technology is an important link in shipbuilding, and ultrasonic diffraction time difference method is one of its important inspection means, but the identification of its TOFD image still mainly relies on manual evaluation.
Xiongfang Fan, Jiawan Tan, Jianfeng Zhang, Yanfeng Gong, Hairui Zhang, Chunsen Huang, Junlong Chen   +6 more
openaire   +2 more sources

Système de contrôle novateur basé sur la technique UT TOFD

e-Journal of Nondestructive Testing, 2023
Du fait de ses nombreux avantages en termes de facilité de mise en oeuvre, de vitesse d’examen, de performances de détection et de caractérisation des indications, la technique de contrôle TOFD (Time of Flight Diffraction) est de plus en plus utilisée ...
Michel Cence, Weina Ke, Celia Chevallier
doaj   +2 more sources

Resolution Enhancement in Ultrasonic TOFD Imaging by Combining Sparse Deconvolution and Synthetic Aperture Focusing Technique (Sparse-SAFT)

Chinese Journal of Mechanical Engineering, 2022
The shallow subsurface defects are difficult to be identified and quantified by ultrasonic time-of-flight diffraction (TOFD) due to the low resolution induced by pulse width and beam spreading.
Xu Sun, Li Lin, Shijie Jin
doaj   +3 more sources

Improving Sandstorm Simulations by Parameterizing Form Drag From Subgrid Sand Dunes Using 30‐m‐Resolution Terrain Data

Geophysical Research Letters
Surface and near‐surface wind speeds, critical factors for dust emission, are often overestimated in desert regions by models, leading to exaggerated predictions of sandstorm extent and dust concentration. This study implements a new turbulent orographic
Huoqing Li, Haile Xue, Minzhong Wang, Chenghai Wang, Yisilamu Wulayin, Zonghui Liu, Wen Huo   +6 more
doaj   +2 more sources

Automated detection of weld defects in TOFD images for steel bridges using generative adversarial networks

Case Studies in Construction Materials
Time-of-flight diffraction (TOFD) has been widely adopted for weld defect detection in bridge steel quality assurance due to its harmlessness to the human body, real-time performance, and satisfactory detection accuracy.
Yanfeng Gong, Zihao Chen, Hong Zhang, Meng Xu, Wen Deng   +4 more
doaj   +2 more sources

CIVA as an Aid to Understanding TOFD Dead Zones

e-Journal of Nondestructive Testing
TOFD (Time of Flight Diffraction) has been a popular ultrasonic testing method for many years. It has associated with it, limitations associated with the pulse duration.
Edward Ginzel
doaj   +2 more sources

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, Sina Sodagar, Gholamreza Rashed, Amin Yaghootian   +3 more
doaj   +1 more source

Modeling of ultrasonic testing Time of Flight Diffraction (ToFD) technique by Finite Element Method [PDF]

مجله مدل سازی در مهندسی, 2015
Time-of-flight diffraction (ToFD) is an ultrasonic nondestructive testing technique used for detection, sizing and location of defects in industrial parts. This method has better abilities and benefits than other nondestructive testing techniques.
Somayeh Khorasani, Farhang Honarvar
doaj   +1 more source

Non-contacted Permanent Magnetic Absorbed Wall-climbing Robot for Ultrasonic Weld Inspection of Spherical Tank [PDF]

MATEC Web of Conferences, 2019
A novel wall-climbing robot for the onsite weld inspecting of spherical tank with Time of Flight Diffraction (TOFD) method has been developed, in order to liberate operators from dangerous and heavy working environment.
Ding Yulin, Sun Zhenguo, Chen Qiang
doaj   +1 more source