Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Progress in ultrasonic tendon duct imaging
Ultrasonic imaging of tendon ducts enables the precise localisation of grouting faults in many cases. Additionally to well known criteria for detecting grouting faults in tendon ducts recently new possibilities were developed: Phase value evaluation for qualitative distinction between steel and air reflection and analysing backscatter from the area of bottom side of tendon ducts. The application of linear array technique enables much faster data acquisition and data analyses. Examples and comparison with automated scanning measurement including phase value analysis are presented. Two main effects influence the complex behaviour of wave propagation and reflection: - Different arrangement and number of strands or internal rebars - Superposition of reflecting signals and different wave modes propagating into the interface region around the tendon duct. In order to understand the experimental results, EFIT modelling is performed (EFIT: Elastodynamic Finite Integration Technique). From this synthetic ultrasonic echo data are calculated. They are used as data sets for reconstruction calculation with SAFT (SAFT: Synthetic Aperture Focusing Technique). These results are compared to SAFT reconstruction calculation of the measured data in order to analyse the influences of the filling condition of the duct on the propagation of the elastic waves.
Progress in ultrasonic tendon duct imaging
Ultrasonic imaging of tendon ducts enables the precise localisation of grouting faults in many cases. Additionally to well known criteria for detecting grouting faults in tendon ducts recently new possibilities were developed: Phase value evaluation for qualitative distinction between steel and air reflection and analysing backscatter from the area of bottom side of tendon ducts. The application of linear array technique enables much faster data acquisition and data analyses. Examples and comparison with automated scanning measurement including phase value analysis are presented. Two main effects influence the complex behaviour of wave propagation and reflection: - Different arrangement and number of strands or internal rebars - Superposition of reflecting signals and different wave modes propagating into the interface region around the tendon duct. In order to understand the experimental results, EFIT modelling is performed (EFIT: Elastodynamic Finite Integration Technique). From this synthetic ultrasonic echo data are calculated. They are used as data sets for reconstruction calculation with SAFT (SAFT: Synthetic Aperture Focusing Technique). These results are compared to SAFT reconstruction calculation of the measured data in order to analyse the influences of the filling condition of the duct on the propagation of the elastic waves.
Progress in ultrasonic tendon duct imaging
Fortschritt bei der Ultraschallabbildung von Spannkanälen
Krause, Martin (Autor:in) / Mayer, Klaus (Autor:in) / Friese, Martin (Autor:in) / Milmann, Boris (Autor:in) / Mielentz, Frank (Autor:in) / Ballier, Gregor (Autor:in)
2009
8 Seiten, 5 Bilder, 1 Tabelle, 13 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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