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Distributed optical fiber Raman double-ended temperature demodulation method based on differential temperature compensation

A distributed optical fiber and temperature compensation technology, applied in thermometers, thermometers with physical/chemical changes, measuring devices, etc., can solve the problems of low temperature measurement accuracy and limited application, so as to optimize temperature accuracy, improve temperature sensitivity, well-designed effects

Active Publication Date: 2020-12-29
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the existing distributed optical fiber Raman sensing system has low temperature measurement accuracy and the technical bottleneck that it cannot change 1°C, resulting in limited application, the present invention proposes a distributed optical fiber Raman sensing system based on differential temperature compensation. The Mann double-ended temperature demodulation method, by introducing the fiber temperature sensitivity factor, recalibrates the Raman scattering signal intensity in the sensing fiber to improve the temperature sensitivity of its spontaneous Raman scattering to optimize the temperature accuracy of the system

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  • Distributed optical fiber Raman double-ended temperature demodulation method based on differential temperature compensation
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  • Distributed optical fiber Raman double-ended temperature demodulation method based on differential temperature compensation

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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than All the embodiments; based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

[0026] The embodiment of the present invention provides a distributed optical fiber Raman double-ended temperature demodulation method based on differential temperature compensation, such as figure 1 As shown, the detection device used includes a pulsed laser 1, a circulator 2, an optical switch 3, a filter 6, a first avalanche photodetector 7, a second avalanche photodetector 8, a data acquisition card 11, a compute...

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Abstract

The invention belongs to the field of temperature demodulation in a distributed optical fiber sensing system, and discloses a distributed optical fiber Raman dual-end temperature demodulation method based on differential temperature compensation. The present invention introduces the fiber temperature sensitive factor in the demodulation process M (L) , recalibrate the Raman scattering signal intensity in the fiber, improve the temperature sensitivity of spontaneous Raman scattering, and finally optimize the temperature accuracy of the system. The invention has a reasonable design and effectively solves the problem of low temperature measurement accuracy of the system due to the temperature sensitivity of the spontaneous Raman scattering signal in the existing distributed optical fiber Raman temperature measurement system, making the temperature measurement accuracy better than 1°C. It breaks through its technical bottleneck and is suitable for distributed optical fiber Raman temperature measurement system.

Description

technical field [0001] The invention belongs to the field of temperature demodulation in a distributed optical fiber sensing system, and in particular relates to a distributed optical fiber Raman double-end temperature detection device and a demodulation method based on differential temperature compensation. Background technique [0002] The distributed optical fiber Raman temperature sensing system can use the specific optical effect along the sensing fiber to obtain the temperature profile of the spatial distribution. Compared with the traditional discrete sensing measurement method, it has the advantages of distributed and high resolution. In the distributed optical fiber Raman temperature sensing system, the principle of Raman scattering is based on the energy exchange in the sensing optical fiber. When the pulse photons and fiber molecules cause inelastic collisions in the optical fiber, it will produce an anti-Laman with a center wavelength of 1450nm. Stokes Raman scat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
CPCG01K11/32G01K11/324
Inventor 张明江周新新李健张建忠闫宝强许扬余涛于福浩
Owner TAIYUAN UNIV OF TECH
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