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A platform for research: civil engineering, architecture and urbanism
A comparative field study of fibre bragg grating strain sensors and resistive foil gauges for structural integrity monitoring
A spatially multiplexed WDM based fibre Bragg grating (FBG) sensor system has been developed as part of a condition maintenance and structural integrity monitoring programme of large civil engineering structures. The system has been field deployed for real-time strain monitoring on a new 346m long steel road bridge in Norway. Two sections of the bridge were instrumented with both fibre Bragg grating sensors and conventional resistive strain gauges. In this paper laboratory as well as field results are reported and comparisons are made between the performance of fibre and conventional gauges. For each loading test, both fibre and resistive gauge measurements were taken. The results show a good agreement between the resistive gauges and Bragg grating sensors for both static and dynamic test. On average measurement results from the Bragg grating sensor system showed a standard deviation of less than 1 mykro epsilon, while the resistive gauges showed a maximum standard deviation of 1.8 mykro epsilon. Although provision was made for temperature compensation with a Bragg sensor attached to a strain isolated separate steel as well as conventional thermocouples for measuring local temperatures, no attempt is made here to use such data for compensation as the tests carried out over a short time period (120 seconds maximum), which is too short time for any thermal fluctuations to occur on such a large structure. This work has demonstrated the advances and practicality of using fibre Bragg grating sensors in the instrumentation and monitoring of large civil engineering field structures. It has also shown that when operating n field conditions, FBG sensors can be surface bonded to structures with as much ease as conventional strain gauges elements and thus the superior performance of FBG sensors over foil gauges and in particular multi point sensing for site management can be realised making the FBG system cost effective.
A comparative field study of fibre bragg grating strain sensors and resistive foil gauges for structural integrity monitoring
A spatially multiplexed WDM based fibre Bragg grating (FBG) sensor system has been developed as part of a condition maintenance and structural integrity monitoring programme of large civil engineering structures. The system has been field deployed for real-time strain monitoring on a new 346m long steel road bridge in Norway. Two sections of the bridge were instrumented with both fibre Bragg grating sensors and conventional resistive strain gauges. In this paper laboratory as well as field results are reported and comparisons are made between the performance of fibre and conventional gauges. For each loading test, both fibre and resistive gauge measurements were taken. The results show a good agreement between the resistive gauges and Bragg grating sensors for both static and dynamic test. On average measurement results from the Bragg grating sensor system showed a standard deviation of less than 1 mykro epsilon, while the resistive gauges showed a maximum standard deviation of 1.8 mykro epsilon. Although provision was made for temperature compensation with a Bragg sensor attached to a strain isolated separate steel as well as conventional thermocouples for measuring local temperatures, no attempt is made here to use such data for compensation as the tests carried out over a short time period (120 seconds maximum), which is too short time for any thermal fluctuations to occur on such a large structure. This work has demonstrated the advances and practicality of using fibre Bragg grating sensors in the instrumentation and monitoring of large civil engineering field structures. It has also shown that when operating n field conditions, FBG sensors can be surface bonded to structures with as much ease as conventional strain gauges elements and thus the superior performance of FBG sensors over foil gauges and in particular multi point sensing for site management can be realised making the FBG system cost effective.
A comparative field study of fibre bragg grating strain sensors and resistive foil gauges for structural integrity monitoring
Eine vergleichende Feldstudie faseroptischer Bragg-Gitter-Dehnungssensoren und Folien-DMS zur Zustandsüberwachung von Strukturen
Gebremichael, Y.M. (author) / Meggitt, B.T. (author) / Boyle, W.J.O. (author) / Li, W. (author) / Grattan, K.T.V. (author) / McKinley, B. (author) / Boswell, L. (author) / Aarnes, K.A. (author) / Aasen, S.E. (author) / Kvenild, L. (author)
2001
9 Seiten, 9 Bilder, 9 Quellen
Conference paper
English
Structural integrity monitoring with fibre Bragg grating sensors
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