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Determination of the position of a localized heat source within a chirped fibre Bragg grating using a Fourier transform technique

Nand, Anbhawa and Kitcher, Daniel J and Wade, Scott A and Nguyen, Thinh B and Baxter, Gregory W and Jones, Rhys and Collins, Stephen F (2006) Determination of the position of a localized heat source within a chirped fibre Bragg grating using a Fourier transform technique. Measurement Science and Technology, 17. pp. 1436-1445. ISSN 0957-0233

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Abstract

The ability to determine the centre position of a localized temperature change within a chirped fibre Bragg grating (CFBG) has been investigated as a function of grating strength. The intragrating sensor is based on the analysis of reflected power spectra arising from a CFBG. The technique uses a discrete Fourier transform (FFT) in which the measured spectrum of the CFBG due to a localized temperature change (heat source) was simulated using a FFT grating design model. The model operated on the reference spectrum and hypothesis temperature distributions, T (z), to generate a spectrum of a CFBG subjected to a hypothesis temperature disturbance. The simulated spectrum was fitted to the measured spectrum using a three-parameter automatic disturbance function fitting algorithm operating on position, width and amplitude of temperature change. RMS deviations to within 0.03 mm of applied values of position have been obtained.

Item Type: Article
Uncontrolled Keywords: chirped fibre Bragg gratings, intragrating sensors, temperature measurement
Subjects: RFCD Classification > 290000 Engineering and Technology
Faculty/School/Research Centre/Department > School of Engineering and Science
Depositing User: Ms Phung T Tran
Date Deposited: 04 Feb 2009 17:13
Last Modified: 05 Jul 2011 23:50
URI: http://vuir.vu.edu.au/id/eprint/1728
DOI: 10.1088/0957-0233/17/6/023
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Citations in Scopus: 4 - View on Scopus

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