Performance improvement in double ended RDTS by suppressing the local external physics perturbation and intermodal dispersion
We propose and experimentally demonstrate a novel Raman based distributed fiber optics temperature sensor (RDTS) for improving the temperature measurement accuracy and engineering applicability. The proposed method is based on double ended demodulation with a reference temperature and dynamic dispersion difference compensation method, which can suppress the effect of local external physics perturbation and intermodal dispersion on temperature demodulation results. Moreover, the system can omit the pre calibration process by using the reference temperature before the temperature measurement. The experimental results of dispersion compensation indicate that the temperature accuracy optimizes from 5.6degC to 1.2degC, and the temperature uncertainty decreases from 16.8degC to 2.4degC. Moreover, the double ended configuration can automatically compensate the local external physics perturbation of the sensing fiber, which exhibits a distinctive improvement.