Problems of extracting ultrasonic signals from structural noise during inspection of articles produced from materials with complex structures

Kachanov, V. K.; Kartashev, V. G.; Соколов, И. В.; Turkin, Mikhail

doi:10.1134/s1061830907090070

Cited by 21 publications

(1 citation statement)

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“…There are materials in which so-called structural noise occurs at the boundaries of crystal grains due to multiple rescattering of the probing pulses [ 41 ]. For such materials, it is not possible to increase the signal-to-noise ratio due to the increase in the energy input into the material, since simultaneously with the increase in the amplitude of the pulse reflected from the defect, increases the amplitude of the pulses reflected from the boundaries of the crystal grains.…”

Section: Improving the Image Quality Of The Reflectors Reconstructmentioning

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: Improving the Image Quality Of The Reflectors Reconstructmentioning

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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Assessment of the Degree of Damage to Materials by Acoustic Methods (A Survey). Part 2

et al. 2022

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A method of measuring the velocity of longitudinal ultrasonic waves in large-size concrete products

Timofeev

2009

Meas Tech

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Problems of extracting ultrasonic signals from structural noise during inspection of articles produced from materials with complex structures

Cited by 21 publications

References 1 publication

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

Assessment of the Degree of Damage to Materials by Acoustic Methods (A Survey). Part 2

A method of measuring the velocity of longitudinal ultrasonic waves in large-size concrete products

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