Results 141 to 150 of about 591 (186)

Titanium metal-organic frameworks for photocatalytic CO₂ conversion through a cycloaddition reaction. [PDF]

Nanoscale Adv
Kegere J, Alneyadi SS, Paz AP, Siddig LA, Alblooshi A, Alnaqbi MA, Alzamly A, Greish YE.   +7 more
europepmc   +1 more source

Shear-wave time of flight diffraction (S-TOFD) technique

NDT and E International, 2006
Ultrasonic time of flight diffraction (TOFD) for sizing defects is based on the time of flight of the diffracted echo that is generated when a longitudinal wave is incident on a crack tip.
G Baskaran, Krishnan Balasubramaniam, C Lakshmana Rao   +2 more
exaly   +2 more sources

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TOFD Echo Signal Processing to Achieve Superresolution

Russian Journal of Nondestructive Testing, 2021
It is proposed to use the method of maximum entropy (ME) and the method for constructing the AR model of the TOFD echo spectrum together with the method of splitting the spectrum to increase its resolution and, consequently, information content. The effectiveness of the approach proposed is demonstrated in model experiments. As a result, the resolution
E G Bazulin, Bazulin E G
exaly   +2 more sources

Applicability and applications of alternative TOFD techniques

Ultrasonics
Ultrasonic time-of-flight diffraction (TOFD) technique is applied to non-destructive testing in engineering, but the dead zone influences its applicable range. Alternative TOFD techniques adopt the indirect diffracted waves having long propagation times to decouple from the lateral wave and detect near-surface defects.
Shijie Jin, Zhongbing Luo
exaly   +3 more sources

Reliability assessment of manual ultrasonic time of flight diffraction (TOFD) inspection for complex geometry components

NDT and E International, 2010
Experimental probability of detection (POD) and probability of sizing (POS) curves are developed for the detection and sizing of surface-breaking cracks in components having complex geometry.
Krishnan Balasubramaniam
exaly   +2 more sources

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

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

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

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