A Method of Temperature Calibration at the Site of Pipeline Leakage Monitoring

Abstract

The invention provides a method for temperature calibration at the site of pipeline leakage monitoring. In order to select calibration points on the entire link of the sensor optical cable to be tested, single-point temperature calibration is performed on the calibration points in turn, and each calibration point obtains a set of actual measurements. temperature value and a set of standard temperature values; read the back Raman scattered light curve data of the entire link of the sensing optical cable to be tested, and perform polynomial fitting with the calibration point as the end point to obtain the section trend function, according to the The section trend item function is used to import the standard temperature value of each calibration point to complete the temperature calibration of all points of the sensing optical cable to be tested; the integration generates the temperature calibration table of the entire link of the sensing optical cable. It fills the blank of on-site temperature calibration in DTS engineering, and the practical application proves the operability and convenience of the method of the present invention, and 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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