Initial development of wireless acoustic emission sensor Motes for civil infrastructure state monitoring

Christian U. Grosse, Steven D. Glaser, Markus Krüger

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

The structural state of a bridge is currently examined by visual inspection or by wired sensor techniques, which are relatively expensive, vulnerable to inclement conditions, and time consuming to undertake. In contrast, wireless sensor networks are easy to deploy and flexible in application so that the network can adjust to the individual structure. Different sensing techniques have been used with such networks, but the acoustic emission technique has rarely been utilized. With the use of acoustic emission (AE) techniques it is possible to detect internal structural damage, from cracks propagating during the routine use of a structure, e.g. breakage of prestressing wires. To date, AE data analysis techniques are not appropriate for the requirements of a wireless network due to the very exact time synchronization needed between multiple sensors, and power consumption issues. To unleash the power of the acoustic emission technique on large, extended structures, recording and local analysis techniques need better algorithms to handle and reduce the immense amount of data generated. Preliminary results from utilizing a new concept called Acoustic Emission Array Processing to locally reduce data to information are presented. Results show that the azimuthal location of a seismic source can be successfully identified, using an array of six to eight poor-quality AE sensors arranged in a circular array approximately 200 mm in diameter. AE beamforming only requires very fine time synchronization of the sensors within a single array, relative timing between sensors of 1 μs can easily be performed by a single Mote servicing the array. The method concentrates the essence of six to eight extended waveforms into a single value to be sent through the wireless network, resulting in power savings by avoiding extended radio transmission.

Originalspracheenglisch
Seiten (von - bis)197-209
Seitenumfang13
FachzeitschriftSmart Structures and Systems
Jahrgang6
Ausgabenummer3
DOIs
PublikationsstatusVeröffentlicht - 1 Jan 2010
Extern publiziertJa

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Acoustic emissions
Monitoring
Sensors
Wireless networks
Synchronization
Array processing
Radio transmission
Prestressing
Beamforming
Wireless sensor networks
Electric power utilization
Inspection
Wire
Cracks

Schlagwörter

    ASJC Scopus subject areas

    • !!Control and Systems Engineering
    • !!Computer Science Applications
    • !!Electrical and Electronic Engineering

    Dies zitieren

    Initial development of wireless acoustic emission sensor Motes for civil infrastructure state monitoring. / Grosse, Christian U.; Glaser, Steven D.; Krüger, Markus.

    in: Smart Structures and Systems, Jahrgang 6, Nr. 3, 01.01.2010, S. 197-209.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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