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为提高布里渊时域分析的传感精度,探寻一种相同条件下传感更为稳定、精确的传感光纤,通过实验得到一种布里渊频移与温度拟合线性度约为1的传感光纤。理论上分析了布里渊散射谱线宽度对温度传感测量精度的影响机制,在布里渊时域分析系统实验中分别以普通单模光纤与非零色散位移光纤(G.655)为传感光纤,测出在一定温度变化范围内标定点的布里渊散射谱线宽度和频移值。实验结果表明,非零色散位移光纤的布里渊散射谱线宽度随温度变化比较稳定,具有较高的传感精度。因此以G.655光纤为传感光纤更利于长距离监测场传感精度的提高。
In order to improve the sensing accuracy of the Brillouin time-domain analysis, a sensing fiber with more stable and accurate sensing under the same conditions is explored. The fitting linearity of the Brillouin frequency shift to the temperature is about 1 Sensing fiber. Theoretical analysis of the Brillouin scattering line width on the accuracy of temperature sensing mechanism, in the Brillouin time-domain analysis system experiments were ordinary single-mode fiber and non-zero dispersion shifted fiber (G.655) as Sense fiber, measured within a certain temperature range of calibration points Brillouin scattering line width and frequency shift value. The experimental results show that the Brillouin scattering line width of non-zero dispersion-shifted fiber is stable with temperature and has high sensing accuracy. Therefore, G.655 fiber as the sensing fiber is more conducive to long-distance monitoring of field-sensing accuracy.