High Precision Distributed Optical Fiber Temperature Sensing System Based on Intensity Compensation

We proposed a novel method to improve the measurement accuracy for temperature in optical fiber sensing based on Brillouin intensity compensation. A model of Brillouin intensity compensation is proposed to improve the measurement accuracy for temperature, which can effectively calculate the attenuation of Brillouin intensity along with the sensing optical fiber. After intensity compensating of Brillouin signal based on the model, we can accurately quantify the relative variation of Brillouin intensity along with the sensing fiber. The parameters of Brillouin intensity compensation are modified by combining the experimental data of the sensing fiber under different temperatures. To verify the demodulation effect of the model in optical fiber sensing, the obtained results through the above model are compared with the ones with the traditional solution method. The deviation analysis proves that the measurement accuracy can be improved by more than 8%.