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Abstract
In order to overcome the limitations of traditional ultrasonic imaging methods, which cannot directly give the imaging results of defects in a pipeline and have low imaging quality, a frequency domain synthetic aperture focusing pipeline imaging method based on phase migration is proposed. The measured data were reconstructed by frequency domain synthetic aperture focusing, and the results were compared with those of time-domain synthetic aperture focusing imaging. The results show that the frequency domain synthetic aperture imaging method is more accurate for the location and quantification of defects in a pipeline, the influence of noise waves on the imaging transverse resolution is reduced, and the imaging resolution is increased by nearly 30%. It was found that the quantitative errors of axial double defects are 5.2% and 17.9%, and that of circumferential defects is 7.5%. These results show that the frequency domain synthetic aperture focusing pipeline imaging algorithm based on phase migration can achieve the accurate determination of multiple defects in pipelines.
Highlights
Pipelines play an important role in industries
In order to solve the problem that the ultrasonic imaging detection technology cannot intuitively detect and quantify defects, based on the principle of explosion reflection combined with the wave field extrapolation theory, a frequency domain synthetic aperture focusing pipeline imaging method based on phase migration is proposed
At the same time, comparing the two methods, the transverse horizontal width of the half-wave height after processing was approximately reduced to 73.8%; that is, the imaging resolution was improved by about 30%, and the quantitative error was reduced by 26.1%, indicating that the frequency domain synthetic aperture focusing technique (SAFT) algorithm is more accurate than the time-domain SAFT algorithm in quantifying the defects and offers improved imaging resolution
Summary
Pipelines play an important role in industries. Ultrasonic guided wave inspection technology has become one of the most important methods in pipeline inspection due to its advantageous long distance and non-contact process. The synthetic aperture focusing technique (SAFT) is considered to be one of the most effective means to improve image resolution. Wu Shiwei and Wu Haiteng of Zhejiang University carried out research on frequency domain synthetic aperture imaging technology for water immersion ultrasonic detection of a focused probe. In order to solve the problem that the ultrasonic imaging detection technology cannot intuitively detect and quantify defects, based on the principle of explosion reflection combined with the wave field extrapolation theory, a frequency domain synthetic aperture focusing pipeline imaging method based on phase migration is proposed. The in-plate imaging algorithm is extended to the pipeline imaging to realize the quantitative analysis of defect location, which effectively improves the resolution of the time-domain SAFT technology in pipeline defect detection.
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