Results 111 to 120 of about 252 (152)

Research on the Application of 20 Degrees Probe Pair in TOFD

Advanced Materials Research, 2014
The feasibility of the application of probes with refraction angle of 20 degrees is discussed, and application effects of the probe are verified by experimental testing. The result shows, for ultrasonic TOFD testing of small flaws in lower part of high-wall-thickness work-pieces, the probe pair with refraction angle of 20 degree is superior to 45 ...
Wen Bin Li, Xiao Guang Niu, Xiang Feng Zheng   +2 more
exaly   +2 more sources

Immersion and TOFD (I-TOFD): A Novel Combination for Examination of Lower Thicknesses

Journal of Nondestructive Evaluation, 2011
Time of flight diffraction (TOFD) is a well-developed ultrasonic non-destructive testing (NDT) technique which has been applied successfully for accurate sizing of defects in thick sections. Codes of practice such as ASME now permit TOFD for routine examination as an alternative to radiography for thick weldments.
R. Subbaratnam, Saju T. Abraham, B. Venkatraman, Baldev Raj   +3 more
openaire   +1 more source

USING OF TOFD TECHNOLOGY IN THE DEVELOPMENT OF SPC “ECHO +”

Kontrol'. Diagnostika, 2020
Since the creation of SPC «ECHO +», special attention has been paid to ultrasonic testing methods that provide visualization of defect images and measurement of their sizes. Due to its high sensitivity and high accuracy, diffraction methods in many cases make it possible to solve the problem of identifying, classifying, and determining the parameters ...
A. E. Bazulin, A. V. Butov, D. S. Tikhonov, S. V. Romashkin, A. V. Zaushitsyn   +4 more
openaire   +1 more source

Untersuchungen mit TOFD an geschweißten Längsnahtproben

Materials Testing, 2000
Weld examination on Tube Test Specimen using TOFD. In contrast to the pulse echo technique, which is based on the sound field reflection at the flaw surface, the Time of Flight Diffraction (TOFD) technique uses the diffraction of the sound field at the flaw tips.
Gerhard Brekow, Anton Erhard
openaire   +1 more source

Development of Assisted Software for TOFD Testing

Applied Mechanics and Materials, 2012
The detection of flaws is essential as the defects of pipes and containers affect the safe operation of many kinds of equipment. During the industrial production process, it is usually use the ray method to detect the flaws which has radiant effect on the testing personnel.
Qing He, Ze Yue Pan, Yu Ning Zhang
openaire   +1 more source

TIME OF FLIGHT DIFFRACTION (ToFD) WITH THz RADIATION—AN ALTERNATIVE TO THE ULTRA SOUND—ToFD TECHNIQE FOR NON-METALLIC MATERIALS

AIP Conference Proceedings, 2011
A time domain spectrometer in the range of 0.5–2 THz was used for time of flight (ToF) measurements of THz pulses for imperfection detection in non metallic materials. The measurements were performed in comparison to the established ultra sound pulse echo (PE) and time of flight diffraction (ToFD) technique.
U. Ewert, J. Beckmann, L. S. von Chrzanowski, G. Brekow, D. Brackrock, Donald O. Thompson, Dale E. Chimenti   +6 more
openaire   +1 more source

Laser ultrasonic TOFD method

AIP Conference Proceedings, 2001
We applied laser ultrasound for the time of flight diffraction (TOFD) measurement. To find an effective testing condition of TOFD method, laser ultrasonic transmission around the slit in glass specimens was observed using the photoelastic ultrasonic visualization system. After the observation we constructed the laser TOFD system and applied to the slit
openaire   +1 more source

Design of TOFD receiving filter on DSP builder

2014 IEEE Far East Forum on Nondestructive Evaluation/Testing, 2014
TOFD (Time of Flight Diffraction), one of the most advanced technologies in the field of NDT (Nondestructive Testing), is widely used in science and industry to evaluate the properties of material, component or system without causing damage. Experiments on TOFD show that signal is greatly disturbed by the noise received by the receiving probe. Based on
null Jin Wang, null Hao Liu, null Zhong-chang Chen   +2 more
openaire   +1 more source

High-Frequency Filtering of Wedge Materials for TOFD

Materials Evaluation, 2023
This article addresses the question: What effects do different types of wedge materials have, if any, on frequency filtering in high-frequency time of flight diffraction scanning?
openaire   +1 more source

Analysis of Wave Propagation for the TOFD Method by Finite Element Method: Optimization of Test Configuration and Proposal of a New TOFD Method

AIP Conference Proceedings, 2006
Wave propagation in an austenitic stainless steel specimen with a slit open to the lower surface is modeled using finite element method, with consideration of the effects of scattering at grain boundaries. The distribution of energy of a diffracted longitudinal wave shows that this wave has the strongest energy directly above the slit. As a consequence
openaire   +1 more source