High temperature gradient of a conventional tubular furnace is characterized using a single fiber sensing line with
wavelength-multiplexed short-length regenerated Fiber Bragg Gratings. The multiplexed gratings are simultaneously
regenerated using a high temperature annealing process. Temperature calibration from ambient temperature up to 850°C
is conducted leading to a standard deviation of 0.33°C after polynomial fitting of the wavelength shift with temperature.
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G. Laffont ; R. Cotillard and P. Ferdinand
Multiplexed regenerated Fiber Bragg Gratings for high temperature measurement
", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842123 (October 4, 2012); doi:10.1117/12.970624; http://dx.doi.org/10.1117/12.970624