Method for performing temperature calibration on scene of pipeline leakage monitoring

Abstract

The invention provides a method for performing temperature calibration on the scene of pipeline leakage monitoring. Calibration points are selected on the whole link of a sensing optical cable to be measured, single point temperature calibration is performed on the calibration points in turn, and each calibration point obtains a set of actually measured temperature values and a set of standard temperature values; the backward Raman scattering light curve data of the whole link of the sensing optical cable to be measured are read, polynomial fitting is performed with the calibration points acting as endpoints for segmentation and a section trend term function is acquired, and the standard temperature values of all the calibration points are imported according to the section trend term function so that temperature calibration of all the points of the sensing optical cable to be measured is completed; and a temperature calibration table for the whole link of the sensing optical cable is generated through integration. The blank of DTS project scene temperature calibration can be filled, operability and convenience of the method are proved through actual application and thus the method has high practical value.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber temperature monitoring, in particular to a method for temperature calibration at a pipeline leakage monitoring site. Background technique [0002] The distributed optical fiber temperature sensing system (DTS for short) based on Raman scattering realizes demodulation and temperature measurement by detecting the Stokes light transmitted backward in the optical fiber. There are many current temperature demodulation methods, including Loop demodulation, loop demodulation, etc. In the temperature demodulation process, a very important task is temperature calibration, that is, to realize the mapping from Stokes light intensity to temperature, so as to realize accurate temperature measurement. [0003] In an ideal situation where the optical fiber is not interrupted, light transmission in the optical fiber generally attenuates naturally according to the e index. Therefore, in an ideal...

AI Technical Summary

Problems solved by technology

However, in practical engineering applications, such as at the site of pipeline leakage monitoring, the influence of environmental factors on optical cables laid in the same trench as the pipeline is often extremely unsatisfactory. Problems such as many attenuation points and huge attenuation are very common. The traditional temperature calibration scheme cannot Adapt to complex engineering environments

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