Ultrasonic linear array validation via concrete test blocks

Hoegh, Kyle; Khazanovich, Lev; Ferraro, Christopher C.; Clayton, Dwight A

doi:10.1063/1.4914597

Cited by 8 publications

(9 citation statements)

References 1 publication

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“…The C-scan involves an excitation source and receiver(s) that are moved around the specimen in the same array [62]. Hoegh and Khazanovich used SAFT to study the condition of the concrete-reinforcement interface [13]. The A-scan carried out by Beniwal and Ganguli (2015b) used one stationary transducer and a roaming receiver that was placed at each of the pre-defined grid points [76].…”

Section: Wavelet Scalingmentioning

confidence: 99%

“…Recent research has therefore been focused on identifying several types of internal damage in RC structures. Among these damages are breathing cracks [1,2], micro cracking [3], delamination [4], and voids and inclusions [13]. Voids may be present from conception of new structures if the workability of the concrete is poor or the concrete is not vibrated properly, leading to air pockets in the structure.…”

Section: Introductionmentioning

confidence: 99%

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Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

Epp

Cha

2016

Smart Mater. Struct.

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Decline of the state of infrastructure in North America due to aging over the past decades has spawned burgeoning interest in the detection of internal damage of reinforced concrete (RC) structures via nondestructive testing. This study proposes a new impact-echo analysis method using wavelet transforms. The signals recorded from the microphones are analyzed using percentage of energy information to detect in-situ damages. Further, an artificial neural network (ANN) was used in order to test the feasibility of increasing the automaticity of the impact-echo method and a semi-autonomous sensing setup was used to the same end. The proposed wavelet transform-based approach showed improved accuracy when covering broader areas over conventional methods. The use of an ANN removed the need for a user-defined cutoff value for the classification of intact and damaged locations when a least-squared distance approach was used. It is postulated that this may contribute significantly to testing time reduction.

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Section: Wavelet Scalingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

Epp

Cha

2016

Smart Mater. Struct.

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“…It is crucial to overcome these challenges to improve inspectors' safety, reduce human errors, and successfully adapt the inspection methods to various types of infrastructure. Inspection methods for the detection of internal concrete defects employ ultrasound waves, [1][2][3][4] thermography, [5][6][7] electromagnetic waves, [8][9][10] and acoustic sounds 11,12) which have been proposed to overcome the abovementioned challenges. However, considering the long track record of the hammering method, further efforts are required to enable the large-scale applicability of these methods.…”

Section: Introductionmentioning

confidence: 99%

Characterization of laser-induced vibration on concrete surface toward highly efficient laser remote sensing

Mikami

Hasegawa

Kitamura

et al. 2020

Jpn. J. Appl. Phys.

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Laser remote sensing (LRS) using irradiation of high-power laser pulses provides characteristic vibrations (CVs) which are accompanied by internal deterioration. While the principle of LRS is the same as that of the traditional hammering inspection, optimizing the irradiation parameters of laser pulses for vibrating samples is essential for effective LRS. In this study, the frequencies and magnitudes of CVs on a concrete specimen exhibiting a mock inside defect were evaluated by laser pulse irradiation and pendulum impact. When laser pulses were irradiated, the magnitude of CVs increased linearly with increasing laser pulse energy, and higher-order vibration was observed. On the other hand, an optimal spot size was indicated by the non-linear correlation between the fluence and the magnitude of CVs. To obtain an effective LRS, we propose that both high laser fluence and an optimized laser spot size are essential.

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“…Identification based on the spectrum (modal analysis) also constitutes an important class of methods; see, e.g., [13][14][15][16]. An alternative to these methods is the use of Arrival Time Imaging, also called Travel Time Migration or Kirchhoff Migration [17][18][19]. This is a fast but crude method, which is extremely popular in geophysical applications but less so in NDT applications.…”

Section: Introductionmentioning

confidence: 99%

Computational Time Reversal for NDT Applications Using Experimental Data

et al. 2017

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A model-based non destructive testing (NDT) method is proposed for damage identification in elastic structures, incorporating computational time reversal (TR) analysis. Identification is performed by advancing elastic wave signals, measured at discrete sensor locations, backward in time. In contrast to a previous study, which was purely numerical and employed only synthesized data, here an experimental system with displacement sensors is used to provide physical measurements at the sensor locations. The performance of the system is demonstrated by considering two problems of a thin metal plate in a plane stress state. The first problem, which represents passive damage identification, consists in finding the location of a small impact region from remote measurements. The second problem is the identification of the location of a square hole in the plate. The difficulties one encounters in applying this identification method and ways to overcome them are described. It is concluded that while this is a viable model-based identifica-

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Ultrasonic linear array validation via concrete test blocks

Cited by 8 publications

References 1 publication

Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

Air-coupled impact-echo damage detection in reinforced concrete using wavelet transforms

Characterization of laser-induced vibration on concrete surface toward highly efficient laser remote sensing

Computational Time Reversal for NDT Applications Using Experimental Data

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