27 June 2002 Polarization-maintaining fiber Bragg grating interrogation system for multi-axis strain sensing
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Fiber Bragg gratings (FBGs) written into polarizations maintaining (PM) fibers have been employed for multi-axis strain and temperature sensing. In this paper we report the development of a FBG interrogation system that is capable of detecting independently the two orthogonally polarized signals reflected from a PM FBG. The interrogation system imposes no limitation on the measurable strain range. This relaxes the requirements on the bandwidth of the grating spectrum, allowing the use of a shorter PM FBG (larger bandwidth) for sensing applications where a higher spatial resolution is required. In particular, this system is useful in the cases where the spectra of the reflected polarized signals are broadened or split, resulting from strain-induced structural changes of the PM fibre, or caused by the application of a non-uniform strain on the FBG.
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Chen-Chun Ye, Chen-Chun Ye, Steven E. Staines, Steven E. Staines, Stephen W. James, Stephen W. James, Ralph P. Tatam, Ralph P. Tatam, } "Polarization-maintaining fiber Bragg grating interrogation system for multi-axis strain sensing", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472618; https://doi.org/10.1117/12.472618

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