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