基于分布式光纤测温技术在井下长距离的应用

Application of Distributed Optical Fiber Temperature Measurement Technology in Downhole Long Distance

矿下受到电磁场的影响,长距离光纤测温精度比较低。本文提出了一种分布式光纤测温系统设计方案,能够提高长距离光纤的测温精度,即通过理论计算斯托克斯散射解调时,温度与拉曼散射光强的关系,采用具有聚酰亚胺涂覆层并由飞秒激光技术制备的光纤,对几种常见光纤进行单端计算校准和双端自动校准得出衰减的补偿方法。

Due to the influence of electromagnetic fields underground,the accuracy of long-distance optical fiber temperature measurement is relatively low.In this study,a distributed optical fiber temperature measurement system design scheme has been proposed,which can improve the accuracy of long-distance optical fiber temperature measurement.Through theoretical calculations of Stokes scattering demodulation,the relationship between temperature and Raman scattering intensity is reflected.Optical fiber with a polyimide coating and prepared by femtosecond laser technology is used.Compensation methods for attenuation are obtained by performing single end calculation calibration and double end automatic calibration on several common optical fibers.