Results 291 to 300 of about 63,195 (336)
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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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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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Flaw sizing using ultrasonic C-scan imaging with dynamic thresholds
Insight: Non-Destructive Testing and Condition Monitoring, 2017Xiongbing Li +2 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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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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C-scan imaging in molten zinc by focused ultrasonic waves
The Journal of the Acoustical Society of America, 2000Ultrasonic images of a small steel object immersed in molten zinc at 600 °C are obtained with high spatial resolution using a focused ultrasonic pulse-echo technique. The focused ultrasonic waves are generated by a spherical acoustic lens which has been machined at the probing end of a clad buffer rod.
, Ihara, , Jen, , Franca
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Screening of Metal Matrix Composites Using Ultrasonic C-Scans
Journal of Composites Technology and Research, 1989Ultrasonic C-scans can be used to find some types of defects in continuous fiber-reinforced metal matrix composites such as boron/aluminum composites. These defects are related to the fatigue behavior and fracture location of each inspected specimen. The C-scan technique determined the relative amount of defects in boron/aluminum composites.
GP Sendeckyj +4 more
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Encoder Positioning Manual Ultrasonic C-Scan Testing Method and Applications
2021To solve the problems that traditional manual inspection results cannot be visualized and automatic detection equipment is complex and non-maneuverable, a manual ultrasonic C-Scan testing method based on encoder positioning is proposed. By analyzing the characteristics of the ultrasonic A-Scan signal, an acquisition method for ultrasonic A-Scan signal ...
Tianhang Fu, Songping Liu
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Blind image restoration for ultrasonic C-scan using constrained 2D-HOS
2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002A new approach is presented to use higher order statistics (HOS) to deconvolve the effects of blurring in ultrasonic C-scans. The quantization effects of the mechanical scan-grid and the conversion of the 1D A-scan into one pixel on the image cause blurring.
Uvais Qidwai, Chi-Hau Chen
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ISIJ International, 2014