Please use this identifier to cite or link to this item:
Title: Frequency domain synthetic aperture focusing technique for variable-diameter cylindrical components
Authors: Jin, Haoran
Wu, Eryong
Han, Ye
Yang, Keji
Chen, Jian
Keywords: Ultrasonic Imaging
Issue Date: 2017
Source: Jin, H., Wu, E., Han, Y., Yang, K., & Chen, J. (2017). Frequency domain synthetic aperture focusing technique for variable-diameter cylindrical components. The Journal of the Acoustical Society of America, 142(3), 1554-1562.
Series/Report no.: The Journal of the Acoustical Society of America
Abstract: Ultrasonic non-destructive testing (UNDT) plays an important role in ensuring the quality of cylindrical components of equipment such as pipes and axles. As the acoustic beam width widens along propagation depths, the diffraction of acoustic wave becomes serious and the images of defects will be interfered with. To precisely evaluate the dimensions of defects and flaws concealed in components, the synthetic aperture focusing technique (SAFT) is introduced to enhance the image resolutions. Conventional SAFTs have been successfully implemented for the ultrasonic imaging of normal cylinders, while solutions for complex ones, such as variable-diameter cylinders, are still lacking. To overcome this problem, a frequency-domain SAFT for variable-diameter cylindrical components is proposed. This algorithm is mainly based on acoustic field extrapolation, which is modified from cylindrical phase shift migration with the aid of split-step Fourier. After a series of extrapolations, a high-resolution ultrasound image can be reconstructed using a particular imaging condition. According to the experimental results, the proposed method yields low side lobes and high resolutions for flat transducers. Its attainable angular resolution relies on the transducer diameter D and scanning radius R and approximates D/(2R).
ISSN: 0001-4966
DOI: 10.1121/1.5003650
Rights: © 2017 Acoustical Society of America. This paper was published in The Journal of the Acoustical Society of America and is made available as an electronic reprint (preprint) with permission of Acoustical Society of America. 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 
Frequency domain synthetic aperture focusing technique for variable-diameter.pdf3.4 MBAdobe PDFThumbnail

Google ScholarTM




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