Ultrasound based monitoring system for concrete monolithic objects

  • Ultrasound sensors should be embedded into concrete for monitoring concrete properties. These new longitudinal wave sensors with a center frequency of 60 kHz were examined regarding their suitability for ultrasonic measurements in concrete structures in terms of emission characteristics, sensitivity and frequency ränge. For the measurement of the radiation patterns, the sensors were embedded vertically and horizontally in concrete cylinders. The directivity pattern was measured using a laser vibrometer. The sensitivity of the sensor was determined in water using different sensors of the same type. It shows changes in the signal amplitude as well as variations in the frequency ränge for different transmitter-receiver combinations. The attenuation of the concrete affects the achievable resolution of the measurements and thus, the maximum possible spacing of the sensors within a concrete element. Experimental tests helped optimizing the distances with respect to the required resolutionUltrasound sensors should be embedded into concrete for monitoring concrete properties. These new longitudinal wave sensors with a center frequency of 60 kHz were examined regarding their suitability for ultrasonic measurements in concrete structures in terms of emission characteristics, sensitivity and frequency ränge. For the measurement of the radiation patterns, the sensors were embedded vertically and horizontally in concrete cylinders. The directivity pattern was measured using a laser vibrometer. The sensitivity of the sensor was determined in water using different sensors of the same type. It shows changes in the signal amplitude as well as variations in the frequency ränge for different transmitter-receiver combinations. The attenuation of the concrete affects the achievable resolution of the measurements and thus, the maximum possible spacing of the sensors within a concrete element. Experimental tests helped optimizing the distances with respect to the required resolution and the effort of embedding the sensors. The signal attenuation in the concrete was measured in the frequency ränge of 60 kHz in response to various degrees of reinforcement and grain size. For this purpose, the sensors were cast at different distances in the specimens studied. The recorded Signals were evaluated for their amplitude and frequency spectrum.zeige mehrzeige weniger

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Autoren/innen:Julia Wolf, Boris Milmann, Rosemarie Helmerich, Christian Köpp, Frank Mielentz, Herbert Wiggenhauser, J.H. Kurz, R.-M. Moryson, A. Samokrutov, S. G. Alekhin, Ninel Alver, H.-Ö. Sazak
Persönliche Herausgeber/innen:Y. L. Xu, S. Zhu, Y. Xia, Y.Q. Ni, S.S. Law, J. H. Yin, Z.Q. Su
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):SHMII-6 - 6th International conference on structural health monitoring of intelligent infrastructure (Proceedings)
Jahr der Erstveröffentlichung:2013
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen
Herausgeber (Institution):International society for structural health monitoring of intelligent infrastructure
Erste Seite:1
Letzte Seite:6
Freie Schlagwörter:Concrete; Embedded sensor; Monitoring system; Ultrasonic network; Ultrasound
Veranstaltung:SHMII-6 - 6th International conference on structural health monitoring of intelligent infrastructure
Veranstaltungsort:Hong Kong, China
Beginndatum der Veranstaltung:09.12.2013
Enddatum der Veranstaltung:11.12.2013
ISBN:978-962-367-768-4
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:28.11.2013