Kitcher, Daniel J, Nand, Anbhawa, Wade, Scott A, Baxter, Gregory W and Collins, Stephen F (2005) Cross-correlation method to obtain temperature profiles from power reflection spectra of a chirped fiber Bragg grating. In: 17th International Conference on Optical Fibre Sensors (Proc.SPIE vol.5855). SPIE, pp. 816-819.

Abstract

A method of determining the temperature profile along a short length of optical fiber containing a chirped grating is presented. This provides an alternative to the known method of integrating differences between power-only reflectance spectra to recover a distributed measurement of temperature or strain within a chirped grating without the additional equipment requirements of a phase spectrum measurement. In contrast to other methods of processing the spectra of chirped gratings, the windowed cross-correlation method monitors local wavelength shifts directly, and offers immunity to spurious temperature or strain gradients arising from amplitude measurement errors.

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