A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Parameters for the quantitative assessment of ultrasonic imaging for concrete elements
Ultrasonic investigation is an established non-destructive testing method for detection of defects and material characterisation. In the last years scanning ultrasonic echo methods were developed especially for the application in civil engineering. The different scanning ultrasonic echo methods are modified with respect to the type of the transducer applied, the number and the arrangement of transducers and the frequency used. Also different algorithms are used to analyse the measured data, for instance SAFT (Synthetic Aperture Focusing Technique) reconstruction. The results are typically presented as B- and C-scans, obtained from raw data or the SAFT reconstructed data. Since 2001 several German research institutes co-operate within the scope of the research initiative Non-destructive Evaluation of Concrete Structures Using Acoustic and Electromagnetic Echo-Methods (FOR 384) supported by the Deutsche Forschungsgemeinschaft (DFG). One of the tasks is to investigate these ultrasonic echo methods for special applications like the detection of cavities in concrete structures or faults in tendon ducts. Concrete test specimens with intentional faults have been manufactured and investigated. Parameters were defined in order to assess the results of ultrasonic measurements quantitatively. Currently three parameters - the signal/noise-ratio, the lateral edge resolution and the lateral uniformity are considered. The axial edge resolution should follow analogue the lateral edge resolution. First the parameters were calculated using measurement results of selected investigations, where at the least two measurement systems were applied. The calculated parameters for simple test objects are shown. At present an objective comparison of the different measurement systems based on the parameters would be precipitated. Experiences have to be made with further applications on known objects and also for even more complex testing tasks, like investigations of different filled tendon ducts. Discussions of the applied thresholds will be carried on as well. Additionally the programs for the parameter determination have to be unified and to be improved. After that the parameters will enable the user to get more information for the ultrasonic inspection of concrete structures and to compare systematically the systems of ultrasonic imaging. With the parameters objective criteria will be defined for the optimisation of ultrasonic applications in civil engineering.
Parameters for the quantitative assessment of ultrasonic imaging for concrete elements
Ultrasonic investigation is an established non-destructive testing method for detection of defects and material characterisation. In the last years scanning ultrasonic echo methods were developed especially for the application in civil engineering. The different scanning ultrasonic echo methods are modified with respect to the type of the transducer applied, the number and the arrangement of transducers and the frequency used. Also different algorithms are used to analyse the measured data, for instance SAFT (Synthetic Aperture Focusing Technique) reconstruction. The results are typically presented as B- and C-scans, obtained from raw data or the SAFT reconstructed data. Since 2001 several German research institutes co-operate within the scope of the research initiative Non-destructive Evaluation of Concrete Structures Using Acoustic and Electromagnetic Echo-Methods (FOR 384) supported by the Deutsche Forschungsgemeinschaft (DFG). One of the tasks is to investigate these ultrasonic echo methods for special applications like the detection of cavities in concrete structures or faults in tendon ducts. Concrete test specimens with intentional faults have been manufactured and investigated. Parameters were defined in order to assess the results of ultrasonic measurements quantitatively. Currently three parameters - the signal/noise-ratio, the lateral edge resolution and the lateral uniformity are considered. The axial edge resolution should follow analogue the lateral edge resolution. First the parameters were calculated using measurement results of selected investigations, where at the least two measurement systems were applied. The calculated parameters for simple test objects are shown. At present an objective comparison of the different measurement systems based on the parameters would be precipitated. Experiences have to be made with further applications on known objects and also for even more complex testing tasks, like investigations of different filled tendon ducts. Discussions of the applied thresholds will be carried on as well. Additionally the programs for the parameter determination have to be unified and to be improved. After that the parameters will enable the user to get more information for the ultrasonic inspection of concrete structures and to compare systematically the systems of ultrasonic imaging. With the parameters objective criteria will be defined for the optimisation of ultrasonic applications in civil engineering.
Parameters for the quantitative assessment of ultrasonic imaging for concrete elements
Parameter zur quantitativen Bewertung von Ultraschallbildern von Betonelementen
Streicher, D. (author) / Krause, M. (author) / Kohl, C. (author) / Schickert, M. (author) / Kroggel, O. (author) / Müller, W. (author)
2003
11 Seiten, 7 Bilder, 4 Tabellen, 11 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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