面向分布式光纤拉曼测温的新型温度解调方法

发布时间：2018-12-15 01:14

【摘要】：为提高分布式光纤拉曼测温系统的测量速度和测量准确度,提出了一种自补偿光纤损耗及光纤色散的温度解调方法,并进行了实验验证。该方法对斯托克斯与反斯托克斯后向散射信号进行了损耗修正,避免了测温前对整条传感光纤进行定标处理的过程,减小了系统的运行时间;采用色散补偿平移算法对斯托克斯后向散射信号的位置进行修正,获得了与反斯托克斯后向散射信号相同位置处的斯托克斯后向散射信号的强度,降低了光纤色散对温度解调的影响,提高了系统的测温准确度。实验结果表明,当光纤传感距离为5.8km时,温度波动由9.01℃下降到0.57℃,测温准确度由5.50℃优化至0.87℃。
[Abstract]:In order to improve the measurement speed and accuracy of the distributed fiber Raman temperature measurement system, a temperature demodulation method for self-compensating fiber loss and fiber dispersion is proposed and verified by experiments. This method corrects the loss of Stokes and anti-Stokes backscattering signals, avoids the process of calibrating the whole sensing fiber before temperature measurement, and reduces the running time of the system. The position of Stokes backscattering signal is modified by dispersion compensation translation algorithm, and the intensity of Stokes backscattering signal at the same position as anti-Stokes backscattering signal is obtained. The influence of fiber dispersion on temperature demodulation is reduced, and the accuracy of temperature measurement is improved. The experimental results show that the temperature fluctuation decreases from 9.01 鈩，

本文编号：2379669