Long-range distributed strain and temperature measurements with Brillouin optical-fibre time-domain analysis (BOTDA) suffer from systematic errors that are due to the measurement principle itself. The significance of these errors is analysed theoretically and proved by experiments. A compensation method based on the measurement both of the pulsed and of the CW lightwave eliminates these errors and significantly improves the BOTDA method. Measurement deviations of more than 20% from a given temperature difference were reduced to less than 3%.
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Geinitz et al. (1999) studied this question.
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