Geometry Determination of a Foundation Slab Using the Ultrasonic Echo Technique and Geophysical Migration Methods

Grohmann, Maria; Niederleithinger, Ernst; Buske, Stefan

doi:10.1007/s10921-016-0334-z

Cited by 24 publications

(14 citation statements)

References 23 publications

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“…The authors stated that RTM is a suitable technique for detecting defects around steel rebars in a concrete medium. Two of the authors of this paper already published some of the results presented within this article in the Journal of Nondestructive Evaluation (Grohmann, Niederleithinger and Buske ).…”

Section: Imaging Methodsmentioning

confidence: 99%

“…As already mentioned, parts of the RTM results presented in the following section were published in Grohmann et al () at the beginning of 2016. All Figures are cited correctly.…”

Section: Test On a Concrete Specimenmentioning

confidence: 97%

“…(a) Top side of RuFUS foundation slab with scanner system (cf. Grohmann et al ) and (b) lean concrete layer and different levels of reinforcement before placing concrete (cf. Taffe ).…”

Section: Test On a Concrete Specimenmentioning

confidence: 99%

“…Taffe ) and (b) ultrasonic transducer array consisting of 32 dry‐point contact transducers (cf. Grohmann et al ).…”

Section: Test On a Concrete Specimenmentioning

confidence: 99%

See 3 more Smart Citations

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

Grohmann

Müller

Niederleithinger

et al. 2017

Near Surface Geophysics

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Ultrasonic echo testing is widely used in non-destructive testing in civil engineering to investigate concrete structures, to measure thickness, and to locate and characterise built-in components or inhomogeneities. Currently, synthetic aperture focusing techniques are mostly used for imaging. These algorithms are highly developed but have some limitations. For example, it is not possible to image the lower boundary of built-in components like tendon ducts or vertical reflectors. We adopted reverse time migration for non-destructive testing in civil engineering in order to improve the imaging of complicated structures in concrete. By using the entire wavefield, including waves reflected more than once, there are fewer limitations compared to synthetic aperture focusing technique algorithms. As a drawback, the required computation is significantly higher than that for the techniques currently used.Simulations for polyamide and concrete structures showed the potential for non-destructive testing. The simulations were followed by experiments at a polyamide specimen. Here, having acquired almost noise-free measurement data to test the algorithm, we were able to determine the shape and size of boreholes with sufficient accuracy. After these successful tests, we performed experiments at a reinforced concrete foundation slab. We obtained information from the data by reverse time migration, which was not accessible by traditional imaging. The imaging of the location and structure of the lower boundary of the concrete foundation slab was improved. Furthermore, vertical reflectors inside the slab were imaged clearly, and more flaws were found. It has been shown that reverse time migration is a step forward in ultrasonic testing in civil engineering.

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Section: Imaging Methodsmentioning

confidence: 99%

“…As already mentioned, parts of the RTM results presented in the following section were published in Grohmann et al () at the beginning of 2016. All Figures are cited correctly.…”

Section: Test On a Concrete Specimenmentioning

confidence: 97%

“…(a) Top side of RuFUS foundation slab with scanner system (cf. Grohmann et al ) and (b) lean concrete layer and different levels of reinforcement before placing concrete (cf. Taffe ).…”

Section: Test On a Concrete Specimenmentioning

confidence: 99%

“…Taffe ) and (b) ultrasonic transducer array consisting of 32 dry‐point contact transducers (cf. Grohmann et al ).…”

Section: Test On a Concrete Specimenmentioning

confidence: 99%

See 2 more Smart Citations

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

Grohmann

Müller

Niederleithinger

et al. 2017

Near Surface Geophysics

Self Cite

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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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Application of iterative elastic reverse time migration to shear horizontal ultrasonic echo data obtained at a concrete step specimen

Grohmann,

Niederleithinger,

Büttner

et al. 2024

Near Surface Geophysics

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The ultrasonic echo technique is broadly applied in non‐destructive testing (NDT) of concrete structures involving tasks such as measuring thickness, determining geometry and locating built‐in elements. To address the challenge of enhancing ultrasonic imaging for complex concrete constructions, we adapted a seismic imaging algorithm – reverse time migration (RTM) – for NDT in civil engineering. Unlike the traditionally applied synthetic aperture focusing technique (SAFT), RTM takes into account the full wavefield including primary and reflected arrivals as well as multiples. This capability enables RTM to effectively handle all wave phenomena, unlimited by changes in velocity and reflector inclinations. This paper concentrates on applying and evaluating a two‐dimensional elastic RTM algorithm that specifically addresses horizontally polarized shear (SH) waves only, as these are predominantly used in ultrasonic NDT of concrete structures. The elastic SH RTM algorithm was deployed for imaging real ultrasonic echo SH‐wave data obtained at a concrete specimen exhibiting a complex back wall geometry and containing four tendon ducts. As these features are frequently encountered in practical NDT scenarios, their precise imaging holds significant importance. By applying the elastic SH RTM algorithm, we successfully reproduced nearly all reflectors within the concrete specimen. In particular, we were capable of accurately reconstructing all vertically oriented reflectors as well as the circular cross sections of three tendon ducts, which was not achievable with traditional SAFT imaging. These findings demonstrate that elastic SH RTM holds the ability to considerably improve the imaging of complex concrete geometries, marking a crucial advancement for accurate, high‐quality ultrasonic NDT in civil engineering.

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Geometry Determination of a Foundation Slab Using the Ultrasonic Echo Technique and Geophysical Migration Methods

Cited by 24 publications

References 23 publications

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

Computational Time Reversal for NDT Applications Using Experimental Data

Application of iterative elastic reverse time migration to shear horizontal ultrasonic echo data obtained at a concrete step specimen

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