Thermal characterization of FBG strain gauges for the monitoring of the cupola of Duomo di Milano

Alfredo Cigada; Lorenzo Comolli; Alberto Giussani; Fabio Roncoroni; Fabio Zenucchi

doi:10.1117/12.885903

18 May 2011 Thermal characterization of FBG strain gauges for the monitoring of the cupola of Duomo di Milano

Alfredo Cigada, Lorenzo Comolli, Alberto Giussani, Fabio Roncoroni, Fabio Zenucchi

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775380 (2011) https://doi.org/10.1117/12.885903
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

The incoming restoration works of Duomo di Milano main spire requires a continuous structural health monitoring of the cupola supporting it. For reasons mainly connected to the lightning hazard, fiber optic sensors have been selected, based on FBG technology. Strain of the lower part of the vaulting-rigs inside the octagonal cupola is the measurement of interest. Being the expected signals very small and the thermal disturbances very important, a thermal characterization of two types of commercial strain gauges was carried out in laboratory with a thermal chamber and a block of the same marble used for the Duomo construction. This allowed to find a relationship later used to compensate any thermal effects, leading to the extraction of the mechanical load contribution only. An uncertainty analysis gave a result of 5 to 10 μm/m in the tested temperature range -5 °C to +40 °C. The future work will expand the monitoring system to more measurement points and it is expected this can provide an important diagnostic tool during restoration operations.

Citation Download Citation

Alfredo Cigada, Lorenzo Comolli, Alberto Giussani, Fabio Roncoroni, and Fabio Zenucchi "Thermal characterization of FBG strain gauges for the monitoring of the cupola of Duomo di Milano", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775380 (18 May 2011); https://doi.org/10.1117/12.885903

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