Algorithm and System for Automatic Correction of Temperature Curve in Distributed Optical Fiber Temperature Sensing System

Abstract

The present invention discloses an automatic correction algorithm and system of the temperature curve of a distributed fiber -fiber temperature sensing system. The algorithm includes the following steps: the samples are sampled to obtain reference fiber temperature, Stocks light strong data curve, and anti -Stocks light, respectivelyStrong data curve, calculate the non -corrected temperature data reverse curve F (Z); read the correction parameters of all segments from the correction coefficient table, including the range of the segment interval and the correction coefficient.With the calibration coefficient, calculate the correction quantity of the segments, and connect these segmented corrections in turn to get the correction amount data curve Δ (Z) corresponding to the unrefined temperature data inverted curve;The invention can automatically automatically modify the temperature curve at the production debugging process and the project site, speed up the installation and debugging progress, and avoid manual correction operation a lot of time to repeatedly adjust the temperature correction curve.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a temperature curve automatic correction algorithm and system of a distributed optical fiber temperature sensing system. Background technique [0002] In recent years, the distributed optical fiber Raman temperature sensing system has been widely used in distributed temperature monitoring fields such as oil pipelines, power lines, and power plants due to its low cost and no cross-interference of temperature-measuring optical fiber strain. [0003] The distributed optical fiber Raman temperature sensing system is based on the principle of back Raman scattering. When the laser pulse is transmitted in the optical fiber, scattered light such as Raman scattering, Rayleigh scattering and Brillouin scattering will be continuously generated in the optical fiber path. The Raman scattered light includes Stokes light and anti-Stokes light, and the Raman scattered light part wi...

AI Technical Summary

Problems solved by technology

Usually, manual correction is required to transform the temperature-distance relationship curve into an actual level temperature curve. However, since the temperature measuring optical fiber installed in the actual project may have multiple solder joints, some positions may be distorted, resulting in large fluctuations in the temperature curve, so The workload of manual correction operation is relatively large, and repeated adjustments are required to approximate the real temperature curve

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