![](/images/graphics-bg.png)
Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration
Joint Authors
Gao, Xiaorong
Luo, Lin
Duan, Jiaxu
Peng, Jianping
Li, Jinlong
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-02-13
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
TOFD (time of flight diffraction) is a kind of weld defect detection technology by using ultrasonic diffraction wave signal.
Because the diffraction intensity is far less than ultrasonic echo wave intensity, thus, the noise contained in TOFD signal is fairly large, and the formed image is not clear enough.
Therefore, it is difficult to determine the size of defects accurately.
In this paper, a method of noise reduction of TOFD signal and improving the resolution of the image are discussed based on the combination of wavelet thresholding and image registration.
Wavelet multiresolution analysis method is adopted and the A-scan signal is decomposed into different frequency components.
We propose a new threshold function to process the wavelet coefficients, which guarantees to denoise while preserving the useful information as much as possible.
Setting up the ultrasonic TOFD inspection system and the image data with randomly distributed noise can be obtained via fine shake of the probes during testing.
Then, image registration based on maximum correlation and blending is adopted to eliminate the noise in further step.
The result shows that the proposed method can achieve denoising, together with resolution enhancement.
American Psychological Association (APA)
Duan, Jiaxu& Luo, Lin& Gao, Xiaorong& Peng, Jianping& Li, Jinlong. 2018. Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration. Journal of Sensors،Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1202291
Modern Language Association (MLA)
Duan, Jiaxu…[et al.]. Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration. Journal of Sensors No. 2018 (2018), pp.1-8.
https://search.emarefa.net/detail/BIM-1202291
American Medical Association (AMA)
Duan, Jiaxu& Luo, Lin& Gao, Xiaorong& Peng, Jianping& Li, Jinlong. Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration. Journal of Sensors. 2018. Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1202291
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1202291