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A platform for research: civil engineering, architecture and urbanism
Application of elastic reverse time migration to ultrasonic echo data in civil engineering
The ultrasonic echo method plays a crucial role in non-destructive testing (NDT) in civil engineering (CE). Ultrasonic waves are used to detect internal defects such as voids, cracks, delaminations, and honeycombing without causing any damage to the structure. Ultrasonic testing can also provide valuable information about the concrete properties, such as strength and porosity, which are essential for assessing its overall quality and durability. Further tasks of the ultrasonic echo method include measuring thickness, determining geometry, and localizing as well as examining the shape of built-in components within the concrete constructions. In particular, ultrasonic NDT of tendon ducts is of great importance since defects in grouting or discrepancies between their installation position and the initial construction specifications can highly affect the capacity of concrete structures.For processing and imaging ultrasonic echo data, Synthetic Aperture Focusing Technique (SAFT) algorithms are widely used. The commonly applied variants of SAFT are closely related to established seismic imaging techniques operating in the time domain (e.g. Kirchhoff prestack depth migration) or frequency domain (e.g. Stolt migration). All these methods aim to concentrate the recorded energy at the surface back to the reflectors within the examined structure. However, normally only primary reflections of the wavefields are accurately handled. Consequently, complex structures in concrete, such as vertical and steeply inclined interfaces, or hidden reflectors, such as the backsides of built-in components, cannot be resolved. For example, imaging the full geometry of tendon ducts inside real concrete structures cannot be achieved by using SAFT.In several studies, an imaging algorithm from geophysics \mbox{-- Reverse Time Migration (RTM) --} has shown its potential to generate more accurate and detailed images of defects and challenging geometries within concrete objects. To tackle the challenge of further improving geometry imaging of ...
Application of elastic reverse time migration to ultrasonic echo data in civil engineering
The ultrasonic echo method plays a crucial role in non-destructive testing (NDT) in civil engineering (CE). Ultrasonic waves are used to detect internal defects such as voids, cracks, delaminations, and honeycombing without causing any damage to the structure. Ultrasonic testing can also provide valuable information about the concrete properties, such as strength and porosity, which are essential for assessing its overall quality and durability. Further tasks of the ultrasonic echo method include measuring thickness, determining geometry, and localizing as well as examining the shape of built-in components within the concrete constructions. In particular, ultrasonic NDT of tendon ducts is of great importance since defects in grouting or discrepancies between their installation position and the initial construction specifications can highly affect the capacity of concrete structures.For processing and imaging ultrasonic echo data, Synthetic Aperture Focusing Technique (SAFT) algorithms are widely used. The commonly applied variants of SAFT are closely related to established seismic imaging techniques operating in the time domain (e.g. Kirchhoff prestack depth migration) or frequency domain (e.g. Stolt migration). All these methods aim to concentrate the recorded energy at the surface back to the reflectors within the examined structure. However, normally only primary reflections of the wavefields are accurately handled. Consequently, complex structures in concrete, such as vertical and steeply inclined interfaces, or hidden reflectors, such as the backsides of built-in components, cannot be resolved. For example, imaging the full geometry of tendon ducts inside real concrete structures cannot be achieved by using SAFT.In several studies, an imaging algorithm from geophysics \mbox{-- Reverse Time Migration (RTM) --} has shown its potential to generate more accurate and detailed images of defects and challenging geometries within concrete objects. To tackle the challenge of further improving geometry imaging of ...
Application of elastic reverse time migration to ultrasonic echo data in civil engineering
Grohmann, Maria (author) / Niederleithinger, Ernst / Reicherter, Klaus / Buske, Stefan
2024-01-01
Aachen : RWTH Aachen University 1 Online-Ressource : Illustrationen (2024). doi:10.18154/RWTH-2025-00276 = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2024
Theses
Electronic Resource
English
Application of Elastic Reverse Time Migration to Ultrasonic Echo Data in Civil Engineering
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