27 June 2002 Development of a fiber optic interferometric inclinometer
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The introduction of long-gauge fiber optic sensors has opened new opportunities for the monitoring of large structures. Using these sensors it is possible to observe the local elongation of a structure and calculate its global deformations. The use of internal sensors detecting integrated strain is however unable to detect the rigid-body motion of a structure with external reference points. Another possibility is to use gravity as a reference to measure vertical rotations of the structure. A gravity- referenced rotation sensor is conventionally called an inclinometer and measures the angle variations between a nominally vertical reference line in the structure and the direction of gravity. It is possible to use uni-axial inclinometers of bi-axial ones, measuring rotations in the two perpendicular vertical planes. Today's inclinometers are based on a variety of techniques and can achieve sensitivities in the micro-radian range. When using fiber optic deformations sensors in a given structure, it would however be interesting to use the same technology to obtain inclination reading. This prompted us to develop a fiber optic-based inclinometer compatible with the SOFO system.
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Daniele Inaudi, Daniele Inaudi, Branko Glisic, Branko Glisic, } "Development of a fiber optic interferometric inclinometer", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472637; https://doi.org/10.1117/12.472637

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