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Proceedings Paper

Thermal characterization of FBG strain gauges for the monitoring of the cupola of Duomo di Milano
Author(s): Alfredo Cigada; Lorenzo Comolli; Alberto Giussani; Fabio Roncoroni; Fabio Zenucchi
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Paper 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.

Paper Details

Date Published: 18 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775380 (18 May 2011); doi: 10.1117/12.885903
Show Author Affiliations
Alfredo Cigada, Politecnico di Milano (Italy)
Lorenzo Comolli, Politecnico di Milano (Italy)
Alberto Giussani, Politecnico di Milano (Italy)
Fabio Roncoroni, Politecnico di Milano (Italy)
Fabio Zenucchi, Politecnico di Milano (Italy)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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