A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Basic investigation with air-coupled ultrasonic echo for concrete elements
Air-coupled ultrasonic (ACU) transducers have made an enormous progress in low frequency application in the last few years. Thus, applications of ultrasonic echo investigations for concrete elements are becoming successful now. The advantage will be the high scanning speed being applied for concrete surfaces. However, the low frequency application is still largely limited to measurements in through transmission. A big advantage will be the use of echo measurements on one-sided accessible objects like floors and bridge decks. In this contribution, research results using ACU echo on concrete are shown. The measurements were carried out with a separate transmitter and receiver in the so-called V-arrangement. Here, one problem is the high intensity of surface waves, resulting from mode conversion at the interfaces. The difficulties and solutions for the signal analysis are presented, which appear due to superposition of the different wave-types. The Rayleigh waves have a special interfering effect on the detection of the backwall-echoes because both waves usually superpose at the point where the back side echo returns to the surface. Concepts are presented to overcome that difficulty.
Basic investigation with air-coupled ultrasonic echo for concrete elements
Air-coupled ultrasonic (ACU) transducers have made an enormous progress in low frequency application in the last few years. Thus, applications of ultrasonic echo investigations for concrete elements are becoming successful now. The advantage will be the high scanning speed being applied for concrete surfaces. However, the low frequency application is still largely limited to measurements in through transmission. A big advantage will be the use of echo measurements on one-sided accessible objects like floors and bridge decks. In this contribution, research results using ACU echo on concrete are shown. The measurements were carried out with a separate transmitter and receiver in the so-called V-arrangement. Here, one problem is the high intensity of surface waves, resulting from mode conversion at the interfaces. The difficulties and solutions for the signal analysis are presented, which appear due to superposition of the different wave-types. The Rayleigh waves have a special interfering effect on the detection of the backwall-echoes because both waves usually superpose at the point where the back side echo returns to the surface. Concepts are presented to overcome that difficulty.
Basic investigation with air-coupled ultrasonic echo for concrete elements
Grundlagenuntersuchungen mit luftgekoppelten Ultraschallechos für Betonbauteile
Gräfe, B. (author) / Krause, M. (author)
2006
8 Seiten, 4 Bilder, 5 Quellen
Conference paper
Storage medium
English
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