A Real-Time Synthetic-Aperture Imaging System

Kino, G. S.; Corl, D.; Bennett, S. D.; Peterson, Kolten

doi:10.1007/978-1-4684-3755-3_22

Cited by 30 publications

(5 citation statements)

References 5 publications

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“…The principle has already been explained for the SAFT-UT method (Section 13.12.2). Figure 13.9 illustrates schematically the system used by Kino and his collaborators [1188,263,1189]. The collection of all data takes only 10 ms and in this time each element of the array is used first as a transmitter and immediately afterwards as a receiver.…”

Section: Scanning Methods With Ultrasonic Pulses 253mentioning

confidence: 99%

Ultrasonic Testing of Materials

Krautkrämer¹,

Krautkrämer²

1990

799

452

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Section: Scanning Methods With Ultrasonic Pulses 253mentioning

confidence: 99%

Ultrasonic Testing of Materials

Krautkrämer¹,

Krautkrämer²

1990

799

452

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“…The first computer-based implementation of SAFT was for the inspection of pressure vessels and further developments included a Fourier transform algorithm for improving the computational speed [1]. Most importantly, the introduction of transducer arrays in the late 1970s has made real-time implementation of SAFT possible [15] [16] [17]. *dinhk4@erau.edu; phone 1 407 576-4848; SAFT was brought to concrete testing in the early 1990s by different research groups in Russia and Germany [1].…”

Section: Conventional Concrete Imaging With Saft 21 Historical Backgr...mentioning

confidence: 99%

Ray-based SAFT for imaging concrete structures from ultrasonic data

Dinh¹,

Tran

Brown³

et al. 2023

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII

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Synthetic aperture focusing technique (SAFT) is one of the most-used ultrasonic imaging algorithms. However, by considering only the direct sound path (i.e., pulse-echo signals) for image reconstruction, this technique is unable to show steeply inclined interfaces and bottom boundaries of objects in concrete structures. To address this problem, the current study considered various sound paths when applying SAFT for concrete elements. The proposed hypothesis is that different sound paths will provide access and imaging opportunities to previously inaccessible areas of the inspected volume/region. As a proof of concept, the proposed method, namely the ray-based SAFT, was tested with ultrasonic shear wave data for two concrete slab specimens. The results indicated a significant improvement compared to conventional SAFT imaging for simulated rebar debonding, vertical boundaries of slabs, and bottoms/sides of tendon ducts.

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“…The lateral resolution along the coordinate of motion in zones in front and behind the focus is significantly worse than the resolution along the electronic scanning direction. In order to improve the resolution along the coordinate of motion, it is reasonable to consider the application of a signal processing technique that is similar to the synthetic aperture method [5].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the dynamic focusing algorithms based on time delays [5]- [7], a 2-D imaging method has been considered that is based on the spatial Fourier transform of received signals by the coordinate of moving a small-size (from a half of wavelength to a few wavelengths) receivingtransmitting element [8]. The spatial Fourier transform then is multiplied by a focusing term that depends on the depth and the spatial and the central temporal frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Approach to 3-D ultrasound high resolution imaging for mechanically moving large-aperture transducer based upon Fourier transform

Benenson

Elizarov

Yakovleva

et al. 2002

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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A new three-dimensional (3-D) acoustic image formation technique is proposed that is based on the transmission of wide bandwidth pulse signals and the application of the 3-D fast Fourier transform. A solution to the Helmholz wave equation has been obtained using the Born approximation. The solution contains analytical expressions for the spatial spectra of the transmit and receive radiation patterns for transducers of various geometries with lenses of fixed focal distances. It has been shown that the proposed algorithms allow for radiation patterns with constant widths at depths both behind and in front of the focal point, starting practically from the plane of the transducer. The theoretical and experimental investigations and computer simulation for both spherical and rectangular transducer shapes have been performed. The results were used to estimate the beamwidths and the side lobe levels. A variant of the linear array has been studied for cylindrical lens of a fixed focal distance moving in a lateral direction. It has been shown that, in this case, a high resolution (of the order of a few wavelengths) can be achieved along all three Cartesian coordinates at a very high scanning velocity. The influence of the moving scatterers' velocity in inhomogeneous medium on the spatial radiation pattern characteristics has been estimated.

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A Real-Time Synthetic-Aperture Imaging System

Cited by 30 publications

References 5 publications

Ultrasonic Testing of Materials

Ultrasonic Testing of Materials

Ray-based SAFT for imaging concrete structures from ultrasonic data

Approach to 3-D ultrasound high resolution imaging for mechanically moving large-aperture transducer based upon Fourier transform

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