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- Beton (5)
- Modellierung (5)
- Ultraschallecho (5)
- Ultrasonic echo (5)
- Phased array (4)
- SAFT (4)
- Ultraschall (4)
- Concrete (3)
- Non-destructive testing (3)
- Reconstruction calculation (3)
- Spannbeton (3)
- Spannkanäle (3)
- Verpressfehler (3)
- EFIT (2)
- Prestressed concrete structures (2)
- Punktquellensynthese (2)
- Radar (2)
- Rekonstruktionsrechnung (2)
- Ultrasonic (2)
- Ultrasonic imaging (2)
- Zerstörungsfreie Prüfung (2)
- 3D-SAFT (1)
- Air-coupled ultrasound (1)
- Array (1)
- Array technique (1)
- Asphalt (1)
- Bauen im Bestand (1)
- Betonbauteile (1)
- Brücken (1)
- Concrete bridge (1)
- Dickenmessung (1)
- EFIT Modelling (1)
- EFIT modelling (1)
- EFIT-modeling (1)
- Elastodynamic Finite Integration Technique (EFIT) (1)
- Elastodynamische Finite Integrationstechnik (1)
- Elastodynamische Finite Integrationstechnik (EFIT) (1)
- FT-SAFT (1)
- Flaw characterization (1)
- Grouting condition (1)
- Gruppenstrahler (1)
- Hohlraumgehalt (1)
- Hüllrohr (1)
- Imaging (1)
- Impact-Echo (1)
- Impact-echo (1)
- Impakt-Echo-Messverfahren (1)
- Impuls-Radar-Messverfahren (1)
- Kosteneinsparung (1)
- Laufzeitgesteuerte Gruppenstrahler (1)
- Leerrohre (1)
- Luftgekoppelter Ultraschall (1)
- Modeling (EFIT) (1)
- Modellierung elastischer Wellen (1)
- NDT (1)
- Nuclear structures (1)
- Phase analysis (1)
- Phase evaluation (1)
- Phased Array (1)
- Phased-Array-Technik (1)
- Point contact probes (1)
- Point source synthesis (1)
- Polarimetrische Abbildungsverfahren (1)
- Post-tensioned concrete (1)
- Prestressed concrete bridges (1)
- Prestressing ducts (1)
- Prüfkopf (1)
- Punktkontaktprüfköpfe (1)
- Radarverfahren (1)
- Reinforced concrete (1)
- Research needs (1)
- SAFT (Synthetic Aperture Focusing Technique) (1)
- Schallfeld (1)
- Sohlplatte (1)
- State of the art (1)
- Tendon duct (1)
- Tendon ducts (1)
- Tendons (1)
- Transversalwellen (1)
- Tunnels (1)
- Ultra sonic testing (1)
- Ultraschall-Array-Messverfahren (1)
- Ultraschall-Echo-Verfahren (1)
- Ultraschall-Rückstreuung (1)
- Ultraschallecho-Verfahren (1)
- Ultraschallprüfung (1)
- Ultraschallsender (1)
- Ultraschallverfahren (1)
- Visualisierung (1)
- Wellenausbreitung (1)
- Zerstörungsfreie Prüfung im Bauwesen (1)
- Zerstörungsfreie Prüfung im Bauwesen (ZfPBau) (1)
- ZfP-Bau (1)
- ZfPBau (1)
This paper describes an innovation of a phased array using dry contact probes to test concrete components. Based on preceding work on pressure waves, a low-frequency ultrasonic phased array consisting of shear wave probes is used in the experiments. This configuration allows the variation and control of the sound field directivity during the measurement. The measurements are carried out on a concrete test block using a scanning laservibrometer and a scanner system in transmission mode. The laboratory measurements are compared to theoretical calculations to investigate the influence of the probes shape and dimension on the resulting sound field patterns. The comparison of the modelling and the measurements demonstrates the suitability of the point source synthesis as a tool for the optimization of probe array designs. Methods of coded are used to improve the signal to noise ratio.
In Zeiten knapper Kassen wird überall nach Wegen gesucht Kosten einzusparen. Im Bauwesen geht es dabei um Kosteneinsparungen ohne Reduktion der Sicherheit und Dauerhaftigkeit des Bauwerks. Beim Bauen im Bestand können mit einer zerstörungsfreien Prüfung von Bauwerken die Weiternutzung oder die erforderlichen Umbauten optimiert werden und so Kosten eingespart werden.
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. Two main effects influence the complex behaviour of wave propagation and reflection: a) different arrangement and number of strands or internal rebars; b) 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).