title: Dynamic two-axis curvature measurement using multicore fiber Bragg gratings interrogated by arrayed waveguide gratings.
abstract: We describe the use of arrayed waveguide gratings (AWGs) in the interrogation of fiber Bragg gratings (FBGs) for dynamic strain measurement. The ratiometric AWG output was calibrated in a static deflection experiment over a +/-200 microepsilon range. Dynamic strain measurement was demonstrated with a FBG in a conventional single-mode fiber mounted on the surface of a vibrating cantilever and on a piezoelectric actuator, giving a resolution of 0.5 microepsilon at 2.4 kHz. We present results of this technique extended to measure the dynamic differential strain between two FBG pairs within a multicore fiber. An arbitrary cantilever oscillation of the multicore fiber was determined from curvature measurements in two orthogonal axes at 1125 Hz with a resolution of 0.05 m(-1).
authors.affiliation: Applied Optics and Photonics Group, Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK. a.fender@hw.ac.uk
authors.forename: Amanda
authors.initials: A
authors.lastname: Fender
authors.forename: Euan J
authors.initials: EJ
authors.lastname: Rigg
authors.forename: Robert R J
authors.initials: RR
authors.lastname: Maier
authors.forename: William N
authors.initials: WN
authors.lastname: MacPherson
authors.forename: James S
authors.initials: JS
authors.lastname: Barton
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Moore
authors.forename: Julian D C
authors.initials: JD
authors.lastname: Jones
authors.forename: Donghui
authors.initials: D
authors.lastname: Zhao
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ian
authors.initials: I
authors.lastname: Bennion
authors.forename: Scott
authors.initials: S
authors.lastname: McCulloch
authors.forename: Ben J S
authors.initials: BJ
authors.lastname: Jones