Extended synthetic aperture focusing technique for ultrasonic imaging of concrete

Hoegh, Kyle; Khazanovich, Lev

doi:10.1016/j.ndteint.2015.05.001

Cited by 57 publications

(37 citation statements)

References 38 publications

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“…In this case the shear wave velocity is 2.739 m/ms. As the survey amplitude with MIRA has limitations (each survey measures approximatively 360 mm), a technique of combination of several consecutive B-Scans into a single panoramic image (SAFT-Pan) was created (Hoegh and Khazanovich [23]). Furthermore, the analysis of the 45 signs in each survey allows the determination of a concrete quality indicator.…”

Section: (3)mentioning

confidence: 99%

Non-destructive ultrasonic tomography for concrete pavement evaluation: signal processing and image analysis of crucial parameters

Salles

Balbo

Khazanovich

2017

Rev. IBRACON Estrut. Mater.

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ResumoIn recent years, due to the destructive and unproductive character of pavement specimen extraction, pavement maintenance technology intensified the use of non-destructive techniques for pavement evaluation which resulted in the development of several devices and evaluation methods. This paper describes the use of technology based on low frequency ultrasonic tomography for evaluation of concrete pavement parameters. The equipment was applied in three experimental sections with different concrete pavements built at the University of Sao Paulo campus. The ultrasonic signal processing is given. The results analysis enables the efficient and reliable identification of thickness and reinforcement position within the concrete slab. Construction problems were evidenced in one of experimental sections with thickness deficiencies and reinforcement in a position below projected. Furthermore, the use of a novel concrete quality indicator was correlated with the presence of transverse cracks and alkali-silica reaction within the sections.

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Section: (3)mentioning

confidence: 99%

Non-destructive ultrasonic tomography for concrete pavement evaluation: signal processing and image analysis of crucial parameters

Salles

Balbo

Khazanovich

2017

Rev. IBRACON Estrut. Mater.

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“…While it would be ideal to know the precise profile especially of the transmitted beam, in systems that we deal with, this is not known. Therefore, we adopt a similar apodization function as in [4] for the anisotropic model. However, the apodization function used in [4] has a slow attenuating window.…”

Section: B Anisotropic Propagationmentioning

confidence: 99%

“…Reconstruction of structures from one-sided UNDE systems are challenging because of the complex interaction of ultrasound waves with matter, the geometry of the experimental set-up, the trade-off between resolution and penetration, and the potentially low signal-to-noise ratio of the received signals [6], [7]. The most widely used reconstruction method for UNDE is the synthetic aperture focusing technique (SAFT) [4], [8]- [12]. SAFT uses a delay-and-sum (DAS) approach to reconstruct ultrasound images.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Model-Based Iterative Reconstruction with Spatially Variant Regularization for One-Sided Non-Destructive Evaluation

Almansouri¹,

Venkatakrishnan²,

Clayton³

et al. 2018

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One-sided ultrasonic non-destructive evaluation (UNDE) is extensively used to characterize structures that need to be inspected and maintained from defects and flaws that could affect the performance of power plants, such as nuclear power plants. Most UNDE systems send acoustic pulses into the structure of interest, measure the received waveform and use an algorithm to reconstruct the quantity of interest. The most widely used algorithm in UNDE systems is the synthetic aperture focusing technique (SAFT) because it produces acceptable results in real time. A few regularized inversion techniques with linear models have been proposed which can improve on SAFT, but they tend to make simplifying assumptions that do not address how to obtain reconstructions from large real data sets. In this paper, we propose a model-based iterative reconstruction (MBIR) algorithm designed for scanning UNDE systems. To further reduce some of the artifacts in the results, we enhance the forward model to account for the transmitted beam profile, the occurrence of direct arrival signals, and the correlation between scans from adjacent regions. Next, we combine the forward model with a spatially variant prior model to account for the attenuation of deeper regions. We also present an algorithm to jointly reconstruct measurements from large data sets. Finally, using simulated and extensive experimental data, we show MBIR results and demonstrate how we can improve over SAFT as well as existing regularized inversion techniques. 1

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“…Further focusing of the reconstruction can be achieved by analyzing changes in instantaneous amplitude within the ROI [23]. The Hilbert transform is useful in calculating instantaneous attributes of a time series, especially the amplitude and frequency [24,25].…”

Section: Instantaneous Amplitude Saft B-scan (Saft-ia)mentioning

confidence: 99%

“…The limited aperture can create situations where measurement interpretation may be inconclusive if an edge of the array is placed directly above a defect [26,27]. To increase the effective aperture and add more redundancy in the measurements, the following procedure was developed to create large panoramic cross sections with increased resolution [23].…”

Section: Saft Panoramicmentioning

confidence: 99%

Quantitative ultrasonic evaluation of concrete structures using one-sided access

Khazanovich

Hoegh

2016

AIP Conference Proceedings

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Abstract. Nondestructive diagnostics of concrete structures is an important and challenging problem. A recent introduction of array ultrasonic dry point contact transducer systems offers opportunities for quantitative assessment of the subsurface condition of concrete structures, including detection of defects and inclusions. The methods described in this paper are developed for signal interpretation of shear wave impulse response time histories from multiple fixed distance transducer pairs in a self-contained ultrasonic linear array. This included generalizing Kirchoff migration-based synthetic aperture focusing technique (SAFT) reconstruction methods to handle the spatially diverse transducer pair locations, creating expanded virtual arrays with associated reconstruction methods, and creating automated reconstruction interpretation methods for reinforcement detection and stochastic flaw detection. Interpretation of the reconstruction techniques developed in this study were validated using the results of laboratory and field forensic studies. Applicability of the developed methods for solving practical engineering problems was demonstrated.

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Extended synthetic aperture focusing technique for ultrasonic imaging of concrete

Cited by 57 publications

References 38 publications

Non-destructive ultrasonic tomography for concrete pavement evaluation: signal processing and image analysis of crucial parameters

Non-destructive ultrasonic tomography for concrete pavement evaluation: signal processing and image analysis of crucial parameters

Ultrasonic Model-Based Iterative Reconstruction with Spatially Variant Regularization for One-Sided Non-Destructive Evaluation

Quantitative ultrasonic evaluation of concrete structures using one-sided access

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