Development of Low-Frequency Phased Array for Imaging Defects in Concrete Structures

Ohara, Yoshikazu; Kikuchi, K.; Tsuji, Toshihiro; Mihara, Tsuyoshi

doi:10.3390/s21217012

Cited by 13 publications

(7 citation statements)

References 50 publications

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“…The nondestructive inspection of concrete structures is indispensable for ensuring the safety and reliability of aging infrastructures. Ultrasonic waves having a frequency of tens of kHz are frequently used to reduce the scattering attenuation due to coarse aggregates (Ohara et al, 2021).…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation of defective reinforced concrete beams with obtained damage of compressed area of concrete

Blikharskyy

Lobodanov

Vegera

2022

Production Engineering Archives

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In the building industry, it is a frequent cause of damage to elements at different stages: during transportation, operation, installation, etc. Since replacing an element is not always possible due to various circumstances, it entails significant financial losses, logistics, and others. For this reason, the expediency of studying the effect of damage on the bearing capacity of reinforced concrete elements is growing. This effect is dependent on its type and has significant variability. In the case of the combination of the defect and damage in reinforced concrete elements, the complexity of the research of this element increases significantly. In this article is discussed: a review of damaged reinforced concrete elements; researching the influence of the damage and additional factors on the element; developed testing methodology for bending reinforced concrete elements with damage to concrete in a compressed zone with insufficient reinforcement, when performing damage to the action of the load and during the action of the load, is presented; the influence on the deformability and bearing capacity of the variability of damage on the sample with insufficient reinforcement is reflected, taking into account the factor of change in the load at which the damage is performed; a comparison is made of the dependence of the change in the actual height of the compressed zone on the change in the load on the elements; implementation of conclusions on the result of the study.

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Section: Literature Reviewmentioning

confidence: 99%

Investigation of defective reinforced concrete beams with obtained damage of compressed area of concrete

Blikharskyy

Lobodanov

Vegera

2022

Production Engineering Archives

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“…Aldo et al [3] applied ultrasonic phased arrays to concrete inspection and demonstrated that the technique could detect in a dry coupled state and still identify defects in the presence of reinforcement. Ohara et al [4] applied an array transducer to a concrete specimen with delamination, and the PA with the LF array transducer clearly visualized the delamination. Therefore, phased array ultrasonic technology can be considered an effective means of detecting the quality of tunnel grouting, and the key to realizing this technology lies in two aspects: phased array optimization and signal noise reduction.…”

Section: Introductionmentioning

confidence: 99%

Optimization of tunnel grouting detection technology based on ultrasonic phased array

Wang,

Li,

Zhou

et al. 2024

Meas. Sci. Technol.

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Due to the lack of a perfect and convenient method to detect the grouting quality of shield tunnels, an optimized ultrasonic phased array tunnel grouting detection technology is proposed. The particle swarm genetic algorithm is optimized to be used for phased array sparse, and the GA-VMD-SG algorithm is proposed to be used for noise reduction of ultrasonic detection signals, and numerical simulation and experimental methods are used to validate the optimized detection effect of the ultrasonic phased array. The results show that: the GA-PSO algorithm can better simplify the array and reduce the maximum sidelobe value; the GA-VMD-SG algorithm can well reduce the noise of ultrasonic signals; numerical simulation and experiments verify the feasibility of the ultrasonic phased array to detect the quality of grouting and the optimization effect of the two algorithms.

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“…Most UT employs piezoelectric transducers. Among them, the ultrasonic phased array, using a piezoelectric array transducer, has been intensively studied for visualizing internal [8][9][10][11][12][13][14][15][16] and surface defects. [17][18][19] Additionally, various types of UT using laser scanning, have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Dark-field ultrasonic imaging method using mode-converted longitudinal evanescent field

Oyabu

Ohara

Tsuji

et al. 2022

Jpn. J. Appl. Phys.

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We propose a dark-field evanescent imaging method to visualize surface/subsurface micro defects with a high signal-to-noise ratio (SNR). This method utilizes the mode-converted longitudinal evanescent field (MCLEF) generated at defects by the incidence of a shear (S) wave. When an incident S wave only has the in-plane displacement on the top surface of a specimen, the 2D scan of a laser Doppler vibrometer, that can only measure out-of-plane displacements, can selectively probe the MCLEF with out-of-plane displacements. Note that the MCLEF can be generated even at a defect that is much smaller than the diffraction limit. In this paper, after describing the principle of the proposed method, we prove the concept in a specimen with a hole by finite element (FE) simulation and experiments. Further FE simulations demonstrate its super-resolution imaging capability for holes of different sizes and higher SNR than a conventional method for various defect geometries.

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Development of Low-Frequency Phased Array for Imaging Defects in Concrete Structures

Cited by 13 publications

References 50 publications

Investigation of defective reinforced concrete beams with obtained damage of compressed area of concrete

Investigation of defective reinforced concrete beams with obtained damage of compressed area of concrete

Optimization of tunnel grouting detection technology based on ultrasonic phased array

Dark-field ultrasonic imaging method using mode-converted longitudinal evanescent field

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