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Distributed fiber temperature measurement method under complex environment

A distributed optical fiber, complex environment technology, applied in the field of distributed optical fiber temperature measurement in complex environments, can solve problems such as inaccuracy, and achieve the effect of ensuring accuracy, simplifying the process, and convenient and quick attenuation compensation.

Active Publication Date: 2016-12-21
PEGASUS QINGDAO OPTOELECTRONICS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the same temperature is raised at the end of the optical fiber, the temperature values ​​demodulated by the mathematical model are different at the beginning and end, which is not accurate enough

Method used

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  • Distributed fiber temperature measurement method under complex environment
  • Distributed fiber temperature measurement method under complex environment
  • Distributed fiber temperature measurement method under complex environment

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specific Embodiment approach

[0034] The method for distributed optical fiber temperature measurement in a complex environment provided by this embodiment includes the steps of 1. calibration, 2. attenuation compensation, and 3. temperature demodulation, such as image 3 As shown, the specific steps of calibration are as follows:

[0035] (1.1) Use the distributed optical fiber sensing system to obtain the anti-Stokes signal and Stokes signal of the experimental fiber, observe the above signals, mark and record the data with melting point and signal attenuation, and record The data defined as decay point data,

[0036] (1.2) obtain the light intensity ratio of described experimental optical fiber anti-Stokes light and Stokes light, and get the logarithm with base 10 to the light intensity ratio,

[0037] (1.3) Take the attenuation point data as the segmentation point to segment the light intensity ratio data calculated by base 10 logarithmically,

[0038] (1.4) According to the segmentation information, ...

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Abstract

The invention relates to a distributed fiber temperature measurement method under a complex environment. The method comprises the steps of calibration, attenuation compensation and temperature demodulation. Through calibration, baseline data of a distributed fiber sensing system is obtained; through attenuation compensation, a multi-discontinuity-point specific value curve of anti-Stokes light and Stokes light of a temperature environment to be measured is reduced to an ideal state through the baseline data; and through the temperature demodulation, an actual temperature value of each point of an optical fiber is calculated through a mathematic model. The method realizes temperature measurement of each point of the optical fiber through laid optical fibers on the working site and under the condition of poor fiber quality and multiple melting points, and expands application range of the distributed fiber temperature measurement, that is, not only the temperature of each point of the fiber can be measured when the fiber is in an ideal state, but also the temperature of each point of the fiber can be measured when the fiber is in the complex environment.

Description

technical field [0001] The invention belongs to the technical field of optical fiber temperature measurement, and in particular relates to a distributed optical fiber temperature measurement method in a complex environment. Background technique [0002] Temperature is one of the important state parameters of all physical, chemical and biological processes, and temperature measurement plays a very important role in engineering applications and scientific research. Because the optical fiber itself is not affected by radio frequency fields and other electromagnetic radiation interference, does not generate electric sparks, and has good insulation properties, the optical fiber temperature sensing technology has become a new technology that is widely used in the field of temperature measurement, the most worthy of in-depth research, and has far-reaching significance. . [0003] The distributed optical fiber temperature sensing system can continuously measure the temperature alon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K15/00G01K11/324
Inventor 王立魏茂安姜海龙
Owner PEGASUS QINGDAO OPTOELECTRONICS