Polarization-maintaining fiber Bragg grating interrogation system for multi-axis strain sensing

Chen-Chun Ye; Steven E. Staines; Stephen W. James; Ralph P. Tatam

doi:10.1117/12.472618

27 June 2002 Polarization-maintaining fiber Bragg grating interrogation system for multi-axis strain sensing

Chen-Chun Ye, Steven E. Staines, Stephen W. James, Ralph P. Tatam

Proceedings Volume 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems; (2002) https://doi.org/10.1117/12.472618
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

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.

Citation Download Citation

Chen-Chun Ye, Steven E. Staines, Stephen W. James, and 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); https://doi.org/10.1117/12.472618

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