A 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 temperatures up to 900 °C is conducted leading to a standard deviation of 0.15 °C after the polynomial fitting of the wavelength shift with the temperature.
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Laffont et al. (2013) studied this question.
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