【摘要】：為提高分布式光纖拉曼測溫系統(tǒng)的測量速度和測量準(zhǔn)確度,提出了一種自補償光纖損耗及光纖色散的溫度解調(diào)方法,并進(jìn)行了實驗驗證。該方法對斯托克斯與反斯托克斯后向散射信號進(jìn)行了損耗修正,避免了測溫前對整條傳感光纖進(jìn)行定標(biāo)處理的過程,減小了系統(tǒng)的運行時間;采用色散補償平移算法對斯托克斯后向散射信號的位置進(jìn)行修正,獲得了與反斯托克斯后向散射信號相同位置處的斯托克斯后向散射信號的強(qiáng)度,降低了光纖色散對溫度解調(diào)的影響,提高了系統(tǒng)的測溫準(zhǔn)確度。實驗結(jié)果表明,當(dāng)光纖傳感距離為5.8km時,溫度波動由9.01℃下降到0.57℃,測溫準(zhǔn)確度由5.50℃優(yōu)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，

本文編號：2379669