title: Quadratic behavior of fiber Bragg grating temperature coefficients.
abstract: We describe the characterization of the temperature and strain responses of fiber Bragg grating sensors by use of an interferometric interrogation technique to provide an absolute measurement of the grating wavelength. The fiber Bragg grating temperature response was found to be nonlinear over the temperature range -70 degrees C to 80 degrees C. The nonlinearity was observed to be a quadratic function of temperature, arising from the linear dependence on temperature of the thermo-optic coefficient of silica glass over this range, and is in good agreement with a theoretical model.
authors.affiliation: School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK.
authors.forename: Gordon M H
authors.initials: GM
authors.lastname: Flockhart
authors.forename: Robert R J
authors.initials: RR
authors.lastname: Maier
authors.forename: James S
authors.initials: JS
authors.lastname: Barton
authors.forename: William N
authors.initials: WN
authors.lastname: MacPherson
authors.forename: Julian D C
authors.initials: JD
authors.lastname: Jones
authors.forename: Karen E
authors.initials: KE
authors.lastname: Chisholm
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ian
authors.initials: I
authors.lastname: Bennion
authors.forename: Ian
authors.initials: I
authors.lastname: Read
authors.forename: Peter D
authors.initials: PD
authors.lastname: Foote