Salza, M.Gagliardi, G.Di Maio, A.Ferraro, P.De Natale, P.Chehura, EdmonTatam, Ralph P.Antonello, CutoloBrian, CulshawJosé, Miguel López-Higuera2011-08-102011-08-102007-12-31M. Salza, G. Gagliardi, A. Di Maio, P. Ferraro, P. De Natale, E. Chehura, R. Tatam, Laser-frequency locking techniques for high-sensitivity strain measurements by high-birefringence fiber Bragg gratings and resonators, Third European Workshop on Optical Fibre Sensors, Napoli, Italy, 4th of July 2007, Pages 661915-1-661915-4.0277-786Xhttp://dx.doi.org/10.1117/12.738379http://dspace.lib.cranfield.ac.uk/handle/1826/5764A new approach to simultaneously interrogate orthogonal axes of single Fiber- Bragg-Gratings (FBGs) and FBG-FabryPerot resonator sensors fabricated in linearly highly birefringent (HiBi) fibre is presented. Novel interrogation techniquesof single Fiber-Bragg-Gratings (FBGs) and FBG-resonator sensors are presented. For a single FBG, we combined alaser-modulation technique to an electronic feedback loop that keeps the source always frequency locked to one peak ofthe sensor's reflected spectrum. Two different lasers, with orthogonally- polarized states, were adopted to monitorsimultaneously both the "fast" and "slow" FBG peaks. The corresponding correction signals from the servo-loop outputscan be interpreted as strain or temperature induced on the FBG. Detection limits ranging from 1 nε/√Hz to 100 nε/√Hz,for axial dynamic and static deformations, respectively, and of 0.025 °C/√Hz for temperature variations, are expected. Asimilar approach was developed for sub-pϵ resolution interrogation of an optical resonator made of a high-reflectivityFBG-pair, using the Pound- Drever-Hall (PDH) stabilizatien-UKCopyright notice format: Copyright 2007 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.Conference paper