Temperature curve self-correcting algorithm and system for distributed optical fiber temperature sensing system

A technology of distributed optical fiber and sensing system, which is applied in the direction of physical/chemical changes in thermometers, thermometers, thermometer testing/calibration, etc. It can solve the problem of heavy manual correction operation, large temperature curve fluctuations, partial position distortion, etc. problem, to speed up the progress of installation and debugging

Active Publication Date: 2015-04-22
WUHAN WUTOS
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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

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  • Temperature curve self-correcting algorithm and system for distributed optical fiber temperature sensing system
  • Temperature curve self-correcting algorithm and system for distributed optical fiber temperature sensing system
  • Temperature curve self-correcting algorithm and system for distributed optical fiber temperature sensing system

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[0042] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0043] The present invention takes a distributed optical fiber Raman temperature sensing system as an example, and its automatic temperature curve correction algorithm includes algorithms such as adaptive segmented calculation, segmented correction calculation, and automatic calculation of correction coefficient tables. The automatic correction of the present invention includes a correction coefficient table required by the algorithm, and each row of the correction coefficient table corresponds to a set of correction coefficients in a segment interval: segment interval range, segment leveling co...

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Abstract

The invention discloses a temperature curve self-correcting algorithm and system for a distributed optical fiber temperature sensing system. The temperature curve self-correcting algorithm comprises the following steps: obtaining a reference optical fiber temperature, a Stokes light intensity data curve and an anti-Stokes light intensity data curve through sampling, obtaining an uncorrected temperature data inverse ratio curve f(z) through calculating, and reading corrected parameters of all piecewise intervals from a correction factor table, wherein the corrected parameters comprise the range of the piecewise intervals and correction factors, and correction factors comprise leveling factors and calibration factors; calculating an allowance of each piecewise interval, sequentially connecting the allowances of the piecewise intervals to obtain an allowance data curve delta(z) corresponding to the uncorrected temperature data inverse ratio curve, and a corrected temperature data curve is calculated. The temperature curve self-correcting algorithm and system for the distributed optical fiber temperature sensing system are capable of performing quick temperature curve self-correction during the production commissioning process and construction site automatically, accelerating the installing and commissioning progress and preventing a huge consumption of time caused by manual correcting operation resulted form repeatedly adjusting a temperature correcting 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...

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Application Information

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IPC IPC(8): G01K15/00G01K11/32G01K11/324
Inventor 简敬元宋珂董雷印新达
Owner WUHAN WUTOS
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