Nand, Anbhawa, Kitcher, Daniel J, Wade, Scott A, Baxter, Gregory W and Collins, Stephen F (2005) Temperature profile measurements within a chirped fiber Bragg grating using a Fourier transform technique. In: 17th International Conference on Optical Fibre Sensors (Proc.SPIE vol.5855). SPIE, pp. 820-823.

Abstract

The use of reflected power spectra arising from a chirped fiber Bragg grating (CFBG) to extract a nonuniform temperature distribution along the grating has been investigated. The technique uses a discrete Fourier transform (FFT) in which the measured spectrum of the CFBG due to a localised temperature change was simulated using the FFT grating design model. The model operated on the reference spectrum and hypothesis temperature distributions, T(z), to generate a spectrum representative of a localised temperature disturbance. The simulated spectrum was fitted to the measured spectrum using a three-parameter disturbance function operating on position, width and amplitude of temperature change. The rms deviation of the applied value for position of a localised temperature change was 0.14 mm.

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