Correction method of errors measured by distributed raman optical fiber temperature measuring system

A Raman fiber, system measurement technology, applied in measurement devices, measurement of heat, thermometers, etc., to eliminate dispersion errors, implement simple, and improve measurement accuracy.

Active Publication Date: 2015-08-26
BEIJING AEROSPACE YILIAN TECH DEV
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Problems solved by technology

It is a method of interpolating the received signal to solve the signal misalignment problem caused by optical fiber dispersion and improve the measurement accuracy of DTS. It can completely eliminate signal misalignment and greatly improve the measurement accuracy.

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  • Correction method of errors measured by distributed raman optical fiber temperature measuring system
  • Correction method of errors measured by distributed raman optical fiber temperature measuring system
  • Correction method of errors measured by distributed raman optical fiber temperature measuring system

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Embodiment Construction

[0022] Such as figure 1 Shown: A correction method for the measurement error of a distributed Raman optical fiber temperature measurement system: including synchronous acquisition of the Stokes light sequence point signal and the anti-Stokes light sequence point signal of the same fiber length, the signal contains the Stokes light sequence point signal The number of Stokes signals is Ns, the signal strength is Vs(n), n=1,2,3...,Ns signals, and the number of anti-Stokes signals is Nas, the signal strength is Vas(n), n =1,2,3...,Nas signal; using Stokes light as a reference light, using the ratio of anti-Stokes light to Stokes light intensity to demodulate the temperature information, wherein the correction the way is:

[0023] The first step: determine the number and signal strength of the sequence points of the Stokes signal and the anti-Stokes signal;

[0024] Step 2: Normalize the positions of the sequence points of the Stokes signal and the anti-Stokes signal for the leng...

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Abstract

The invention discloses a correction method of errors measured by a distributed raman optical fiber temperature measuring system. The correction method comprises the following steps: 1, determining sequence point number and signal intensity of a stokes signal and an anti-stokes signal; 2, performing optical fiber length normalization processing on the sequence point positions of the stokes signal and the anti-stokes signal; 3, calculating anti-stokes signal intensity by adopting an interpolation algorithm after signal position normalization, and obtaining the anti-stokes signal intensity at the same position with the stokes signal. The method is simple to realize, the anti-stokes signal is corrected by a piecewise cubic hermite interpolating polynomial algorithm, dispersion errors can be completely eliminated, and the measuring accuracy is improved greatly. Ideal results are obtained; for the long-distance distributed temperature measuring system, the method is outstanding in advantage and has an important value.

Description

technical field [0001] The invention relates to optical fiber temperature measurement, in particular to a method for correcting measurement errors of a distributed Raman optical fiber temperature measurement system. Background technique [0002] Distributed fiber temperature sensor (Distributed fiber temperature sensor, DTS) is developed in the past two or three decades, using the spontaneous Raman scattering effect in optical fiber combined with optical time domain reflectometry (Optical Time Domain Reflectometry, OTDR). A new type of sensing technology for distributed and real-time measurement of spatial temperature field distribution. This technology uses ordinary optical fiber as a sensitive medium and transmission medium, and has the characteristics of electrical insulation, anti-electromagnetic interference, intrinsic safety, corrosion resistance, small size, light weight, and bendability. It can realize long-distance measurement and monitoring, has the advantages of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 李小彦杨睿苗守功
Owner BEIJING AEROSPACE YILIAN TECH DEV
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