Using “Focusing to a Point” Algorithm for Reference-Free Measurement of the Speed of Ultrasound in Tomography of Concrete Engineering Structures

Kachanov, V. K.; Соколов, И. В.; Kontsov, R. V.; Timofeev, D. V.

doi:10.1134/s1061830919060068

Cited by 6 publications

(1 citation statement)

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“…An incorrect determination of the delay law leads to a change the focal spot dimensions in more than two times and a change in the amplitude of the ultrasonic signal in the range from −2.5 dB to +2.0 dB [ 14 ]. In addition, the signal-to-noise ratio decreases and information about small reflectors may be lost or underestimated, artifacts may appear on the tomogram, as well as increasing the size of the reflectors and incorrect determining of its coordinates [ 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Position Determination Error for Flexible Linear Array Elements on the Tomogram Focusing

Sednev

Soldatov

Kostina

et al. 2023

Sensors

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In the article, the study of the quality of tomogram focusing during the inspection of objects with curved surfaces by flexible acoustic array was described. The main goal of the study was theoretically and experimentally define the acceptable deviation limits of the elements’ coordinates values. The tomogram reconstruction was performed by the total focusing method. The Strehl ratio was chosen as a criterion for assessing the quality of tomogram focusing. The ultrasonic inspection procedure were simulated and validated experimentally by means of convex and concave curved arrays. In the study, it was proven that the elements coordinates of the flexible acoustic array were determined with an error of no more than 0.18λ and the tomogram image was obtained in sharp focus.

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