Application of 3D coherent processing in ultrasonic testing

Bazulin, A. E.; Базулин, Е. Г.; Vopilkin, A. Kh.; Kokolev, S. A.; Romashkin, S. V.; Tikhonov, Denis S.

doi:10.1134/s1061830914020028

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…It can be seen that the indication from the hole, the center of which is indicated by a cross-shaped marker, is barely detected because of the noise level comparable with its amplitude. Figure 4 b shows the result of the reconstruction of the image by these echo signals by the method of projection in spectral space (PSS or FT–SAFT) [ 38 ]. The signal-to-noise image obtained by the PSS increased by more than 12 dB in comparison with the visualization, and the front resolution decreased from 15 mm to 1 mm.…”

Section: Increasing the Signal-to-noise Ratio Of The Image Due To mentioning

confidence: 99%

The Maximum Entropy Method in Ultrasonic Non-Destructive Testing—Increasing the Resolution, Image Noise Reduction and Echo Acquisition Rate

Базулин¹

2018

Entropy

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Abstract:The use of linear methods, for example, the Combined Synthetic Aperture Focusing Technique (C-SAFT), does not allow one to obtain images with high resolution and low noise, especially structural noise in all cases. Non-linear methods should improve the quality of the reconstructed image. Several examples of the application of the maximum entropy (ME) method for ultrasonic echo processing in order to reconstruct the image of reflectors with Rayleigh super-resolution and a high signal-to-noise ratio are considered in the article. The use of the complex phase-shifted Barker code signal as a probe pulse and the compression of measured echoes by the ME method made it possible to increase the signal-to-noise ratio by more than 20 dB for the image of a flat-bottom hole with a diameter of 1 mm in a model experiment. A modification of the ME method for restoring the reflector image by the time-of-flight diffraction (TOFD) method is considered, taking into account the change of the echo signal shape, depending on the depth of the reflector. Using the ME method, 2.5D-images of models of dangling cracks in a pipeline with a diameter of 800 mm were obtained, which make it possible to determine their dimensions. In the object with structural noise, using the ME method, it was possible to increase the signal-to-noise ratio of the reflector image by more than 12 dB. To accelerate the acquisition of echoes in the dual scan mode, it is proposed to use code division multiple access (CDMA) technology based on simultaneous emission by all elements of the array of pseudo-orthogonal signals. The model experiment showed the effectiveness of applying the ME method.

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Section: Increasing the Signal-to-noise Ratio Of The Image Due To mentioning

confidence: 99%

The Maximum Entropy Method in Ultrasonic Non-Destructive Testing—Increasing the Resolution, Image Noise Reduction and Echo Acquisition Rate

Базулин¹

2018

Entropy

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“…The size of the cube is 20×20×20 cm. The homogeneous medium has the density of 1 g/cm 3 and the sound speed of c 0 =1500 m·s −1 (water). The inhomogeneity has a spherical shape with radius of 6 cm and the sound speed of c Ω =1600 m·s −1 .…”

Section: Applicability Of the Layer-by-layer Models To Solving Three-mentioning

confidence: 99%

“…The inhomogeneity has a spherical shape with radius of 6 cm and the sound speed of c Ω =1600 m·s −1 . The density of the ball is assumed to be equal to the density of the environment, 1 g/cm 3 .…”

Section: Applicability Of the Layer-by-layer Models To Solving Three-mentioning

confidence: 99%

Supercomputer technologies in tomographic imaging applications

2016

JSFI

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Currently, tomographic imaging is widely used in medical and industrial non-destructive testing applications. X-ray tomography is the prevalent imaging technology. Modern medical X-ray CT scanners provide up to 1 mm of spatial resolution. The disadvantage of X-ray tomography is that it cannot be used for regular medical examinations. Early breast cancer diagnosis is one of the most pressing issues in modern healthcare. Ultrasound tomography devices are being developed in the USA, Germany and Russia to address this problem. One of the main challenges in ultrasound tomographic imaging is the development of efficient algorithms for solving inverse problems of wave tomography, which are nonlinear three-dimensional coefficient inverse problems for a hyperbolic differential equation. Solving such computationally-expensive problems requires the use of supercomputers.

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Optimization of Numerical Algorithms for Solving Inverse Problems of Ultrasonic Tomography on a Supercomputer

Romanov

2017

Communications in Computer and Information Science

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Application of 3D coherent processing in ultrasonic testing

Cited by 6 publications

References 4 publications

The Maximum Entropy Method in Ultrasonic Non-Destructive Testing—Increasing the Resolution, Image Noise Reduction and Echo Acquisition Rate

The Maximum Entropy Method in Ultrasonic Non-Destructive Testing—Increasing the Resolution, Image Noise Reduction and Echo Acquisition Rate

Supercomputer technologies in tomographic imaging applications

Optimization of Numerical Algorithms for Solving Inverse Problems of Ultrasonic Tomography on a Supercomputer

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