27 July 2004 High-speed dual-axis strain using a single fiber Bragg grating
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It is desirable to make dynamic strain measurements in multiple directions at a single point. In particular this technology could be useful in monitoring multidimensional deflections of ship hulls measuring both axial and transverse strain fields. Conventional strain gages are unable to deliver this type of performance due to the size requirements and lack of available technology. Fiber grating sensors have been shown to deliver accurate strain measurements in two orthogonal directions, but have been limited by the speed at which the signal can be demodulated. As it is desirable to make multi-directional dynamic measurements, a system is required that can deliver a high speed demodulation of the signal from a dual-axis fiber grating sensor. Using available optical components a system was developed to read out orthogonal directions of strain at a point at up to 100 kHz. The resolution in one direction is +/- 40 microstrain and in the other +/- 180 microstrain. The system was initially tested over 4000 microstrain in tension along the higher sensitivity axis.
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Sean G. Calvert, Sean G. Calvert, "High-speed dual-axis strain using a single fiber Bragg grating", Proc. SPIE 5384, Smart Structures and Materials 2004: Smart Sensor Technology and Measurement Systems, (27 July 2004); doi: 10.1117/12.542838; https://doi.org/10.1117/12.542838

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