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2 July 2007 Laser-frequency locking techniques for high-sensitivity strain measurements by high-birefringence fiber Bragg gratings and resonators
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Proceedings Volume 6619, Third European Workshop on Optical Fibre Sensors; 661915 (2007) https://doi.org/10.1117/12.738379
Event: Third European Workshop on Optical Fibre Sensors, 2007, Napoli, Italy
Abstract
A new approach to simultaneously interrogate orthogonal axes of single Fiber-Bragg-Gratings (FBGs) and FBG-Fabry Perot resonator sensors fabricated in linearly highly birefringent (HiBi) fibre is presented. Novel interrogation techniques of single Fiber-Bragg-Gratings (FBGs) and FBG-resonator sensors are presented. For a single FBG, we combined a laser-modulation technique to an electronic feedback loop that keeps the source always frequency locked to one peak of the sensor's reflected spectrum. Two different lasers, with orthogonally-polarized states, were adopted to monitor simultaneously both the "fast" and "slow" FBG peaks. The corresponding correction signals from the servo-loop outputs can be interpreted as strain or temperature induced on the FBG. Detection limits ranging from 1 n&Vegr;/&sqrt;Hz to 100 n&Vegr;/&sqrt;Hz, for axial dynamic and static deformations, respectively, and of 0.025 °C/&sqrt;Hz for temperature variations, are expected. A similar approach was developed for sub-pε resolution interrogation of an optical resonator made of a high-reflectivity FBG-pair, using the Pound-Drever-Hall (PDH) stabilization method..
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Salza, G. Gagliardi, A. Di Maio, P. Ferraro, P. De Natale, E. Chehura, and R. Tatam "Laser-frequency locking techniques for high-sensitivity strain measurements by high-birefringence fiber Bragg gratings and resonators", Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 661915 (2 July 2007); https://doi.org/10.1117/12.738379
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