Article

Dynamic two-axis curvature measurement using multicore fiber Bragg gratings interrogated by arrayed waveguide gratings.

Applied Optics and Photonics Group, Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK.
Applied Optics (impact factor: 1.41). 01/2007; 45(36):9041-8. pp.9041-8
Source: PubMed

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).

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Keywords

+/-200 microepsilon range
 
arbitrary cantilever oscillation
 
arrayed waveguide gratings
 
conventional single-mode fiber
 
dynamic differential strain
 
Dynamic strain measurement
 
FBG pairs
 
fiber Bragg gratings
 
multicore fiber
 
orthogonal axes
 
piezoelectric actuator
 
static deflection experiment
 
vibrating cantilever
 

Amanda Fender