Abstract
This paper introduces an extended non-stationary phase-shift migration (ENSPS) method for ultrasound imaging of irregular surface components. This method extends non-stationary phase-shift (NSPS) technology based on the classical B-scan data to full-matrix capture (FMC) data. In addition, a new surface estimation method (SEM) is also proposed to prepare for ultrasonic imaging of irregular surface components. The method is implemented in the frequency domain, thereby ensuring the computational efficiency. In the numerical simulation, two components with different surface shapes were simulated to study the imaging ability of the method for hole defects and upper surface crack defects in irregular surface components. The simulation results show that the proposed ENSPS can detect hole defects with an interval of 0.5 mm and vertical surface cracks. In order to verify the simulation results, we set up a water-immersed ultrasonic experiment platform and obtained the ENSPS images. As a comparison, the extended phase-shift-plus-interpolation method (EPSPI) is also used to process the same data. The comparison results show that the algorithm proposed in this paper has the advantages of high resolution and low noise for the ultrasonic imaging of irregular surface components.
Highlights
Irregular surface component has been widely used in aerospace, petroleum tankers, automobiles, and electric power-related applications [1]
Qin et al [24] proposed the generalized phase-shift migration (GPSM) of the phase-shiftplus-interpolation method (PSPI) method based on the theory of non-stationary combined linear filtering, and introduced the split-radium-fast-Fourier-transform (SRFFT) algorithm to speed up image reconstruction
In order to quantify the accuracy of extended non-stationary phase-shift migration (ENSPS) technology, this paper introduces array performance indicator (API) defined by Holmes [7] to evaluate the defect resolution of ultrasound image. that is where A−6dB is the area within which the point spread function is greater than −6 dB down from its maximum value
Summary
Irregular surface component has been widely used in aerospace, petroleum tankers, automobiles, and electric power-related applications [1]. The original phase-shift migration (PSM), which originated from reflection seismology, is a frequency-domain algorithm for processing pulse-echo data. It was first proposed by Gazdag [17] in 1978. Margrave developed the NSPS based on the theory of non-stationary convolution filtering These improved phase-shift algorithms were applied to the ultrasound non-destructive testing field [23], and extended from the pulse-echo data to FMC. Qin et al [24] proposed the generalized phase-shift migration (GPSM) of the PSPI method based on the theory of non-stationary combined linear filtering, and introduced the split-radium-fast-Fourier-transform (SRFFT) algorithm to speed up image reconstruction.
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