Please use this identifier to cite or link to this item:
Title: Limited-view ultrasonic guided wave tomography using an adaptive regularization method
Authors: Rao, Jing
Ratassepp, Madis
Fan, Zheng
Keywords: Transducer arrays
Image reconstruction
Issue Date: 2016
Source: Rao, J., Ratassepp, M., & Fan, Z. (2016). Limited-view ultrasonic guided wave tomography using an adaptive regularization method. Journal of Applied Physics, 120(19), 194902-.
Series/Report no.: Journal of Applied Physics
Abstract: Ultrasonic guided waves are useful to assess the integrity of a structure from a remote location. Recently, tomography techniques have been developed to quantitatively estimate the thickness map of plate-like structures based on the dispersion characteristics of guided waves. In many applications only limited locations are available to place transducers. The missing viewing angles lead to artifacts which can degrade the image quality. To address this problem, this paper applies the regularization method to synthesize the missing components. The regularization technique is performed by an adaptive threshold approach to the limited view reconstruction. The effectiveness of this method combined with the full waveform inversion method is demonstrated by using numerical simulations as well as experiments on an irregularly shaped defect and two flat-bottom defects. The results indicate that the additional components obtained from the regularization method can significantly reduce the artifacts, leading to better reconstruction accuracy.
ISSN: 0021-8979
DOI: 10.1063/1.4967790
Rights: © 2016 American Institute of Physics (AIP). This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

Files in This Item:
File Description SizeFormat 
Limited-view ultrasonic guided wave tomography using an adaptive regularization method.pdf4.53 MBAdobe PDFThumbnail

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.