31 May 1999 Multiplexed optical fiber Fabry-Perot sensors for strain metrology
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Abstract
The authors demonstrate that several optical fiber Fabry-Perot sensors can be multiplexed in series for axial strain monitoring at each individual sensor. White light interferometry was employed using the laser-referenced Michelson interferometer of a standard Fourier transform spectrometer as a receiving (interrogating) interferometer. The primary aim was to demonstrate that at least six fiber Fabry-Perot transducer interferometers (sensors) can be multiplexed in series provided that each sensor has a unique optical cavity length within the multiplex. The resulting differing optical path differences at each fiber Fabry-Perot sensor give rise to sharp correlation features (side-bursts) at unique positions in the time domain as observed in the interferogram. An optical cavity length change due to an axial strain perturbation is observed as a change in the position in the time-domain of the side-burst feature associated with the fiber Fabry-Perot sensor. This paper demonstrates that multiplexed strain metrology in the quasi-static regime using fiber Fabry-Perot sensors is possible with a measurement range of typically 0 to 4000 microstrain and a strain resolution of better than 10 microstrain.
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Christopher J. Tuck, Christopher J. Tuck, Gerard Franklyn Fernando, Gerard Franklyn Fernando, } "Multiplexed optical fiber Fabry-Perot sensors for strain metrology", Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999); doi: 10.1117/12.349743; https://doi.org/10.1117/12.349743
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