Results 241 to 250 of about 20,397,556 (300)
Ultrasonics, 2014 Quantitative evaluation of ultrasonic C-scan images in homogeneous and layered anisotropic austenitic materials is of general importance for understanding the influence of anisotropy on wave fields during ultrasonic non-destructive testing and evaluation
Michael Rethmeier, Jens Prager
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Automated Ultrasonic Testing of Materials based on C-scan Flaw Classification
2021 12th International Symposium on Image and Signal Processing and Analysis (ISPA), 2021The analysis of the data in non-destructive ultrasonic testing of materials is a very time- intensive task. To alleviate the aforementioned strain on the human expert inspectors, a plethora of assisted analysis methods based on deep learning have been developed recently.
Branimir Filipovic +5 more
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Neural network correction of ultrasonic C-scan images
Ultrasonics, 1999A neural network-based approach to the correction of C-scan images is presented. This allows the effects of a finite ultrasonic beam diameter in an immersion experiment to be considered, by training the network on a series of defects of known characteristics. The result is an image which is a better representation of the actual defect.
D A, Hutchins +3 more
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Ultrasonic C-scan techniques for the evaluation of impact damage in CFRP
Materials Testing, 2021Abstract In the present work, different ultrasonic C-scan approaches were used to evaluate Carbon Fiber Reinforced Polymers (CFRP) submitted to impacts of low energy, in order to evaluate their effectiveness for the detection and characterization of small defects. In particular, as to the question how useful could be the air-coupled C-
Mário Santos +3 more
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Ultrasonic C-scan imaging for material characterization
Ultrasonics, 1993Abstract Advances in the field have enabled ultrasonic C-scan imaging to go beyond its classical application of detecting large single flaws to meet the challenge of non-destructive evaluation for modern engineered structures and new materials. Increased frequency of operation and novel transducer designs have led to micrometre resolution limits for ...
G.A. Gordon, S. Canumalla, B.R. Tittmann
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SPIE Proceedings, 2003
The replacement of chemical batteries with composite flywheels offers many potential advantages in space applications. Before such flywheels can be successfully employed, it is imperative to ensure their integrity using NDE techniques. Previously, the use of traditional C-scan for the NDE of flywheels was compared to Scanning Ultrasonic Spectroscopy ...
Honghui Wang +3 more
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The replacement of chemical batteries with composite flywheels offers many potential advantages in space applications. Before such flywheels can be successfully employed, it is imperative to ensure their integrity using NDE techniques. Previously, the use of traditional C-scan for the NDE of flywheels was compared to Scanning Ultrasonic Spectroscopy ...
Honghui Wang +3 more
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Evaluation of ultrasonic C-scan attenuation image
IEEE 1991 Ultrasonics Symposium, 2002Temporal averaging and homomorphic processing, which extract the local ultrasonic wavelet and estimate the attenuation coefficient, have been incorporated into C-scan imaging to generate and attenuation map. The variation of this map displays changes in the scattering cross section and in the absorption of materials.
T. Wang, J. Saniie
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An inexpensive computer-controlled ultrasonic C-scan system
NDT International, 1983Abstract A microcomputer-controlled ultrasonic C-scan system is described with emphasis on interfacing and image formation. Examples are given which illustrate the potential of the system for quantitative C-scanning and image enhancement. The system was assembled from inexpensive off-the-shelf items of equipment.
M. Moghisi, D.P. Almond
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Research of Ultrasonic C-scan Imaging Lateral Resolution
2019 IEEE International Conference on Mechatronics and Automation (ICMA), 2019Aiming at the problem of reflective C-scan imaging lateral resolution, this paper proposes to use the right-angle crack reflection method to measure the lateral resolution of ultrasonic transducers. According to the theoretical sound field distribution at the focal plane of the ultrasonic transducer, the corresponding line response function and the ...
Ran Liu +4 more
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Blind image-deconvolution for ultrasonic C-scans
AIP Conference Proceedings, 2001Ultrasonic C-scan images suffer from the problem of gating truncations, blurring due to quantization and squaring distortion, and noise. In this work the H∞ identification strategy is presented to restore the image without any prior information about the distortion and noise, hence the scheme is called blind deconvolution.
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