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Self-correction method capable of eliminating wavelength dispersion of distributed Raman temperature measurement system

A technology of Raman temperature measurement and wavelength dispersion, applied in thermometers, measuring heat, measuring devices, etc.

Inactive Publication Date: 2013-04-03
SHANDONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to address the defects and deficiencies of the existing distributed Raman temperature measurement system, and propose a self-correction method to eliminate the influence of wavelength dispersion on the spatial resolution and temperature accuracy of the system

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  • Self-correction method capable of eliminating wavelength dispersion of distributed Raman temperature measurement system

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Embodiment

[0037] Examples of the present invention figure 1 As shown, a self-correction method to eliminate the wavelength dispersion of the distributed Raman temperature measurement system is realized by the following temperature measurement system, which includes a pulsed laser 1, a 1×3 WDM (wavelength division multiplexer) 2, and a sensing fiber 3. Dual-channel APD photodetector 4, dual-channel data acquisition card 5 and computer 6, wherein pulse laser 1 is connected to the input end of 1×3WDM2, and sensing fiber 3 is connected to 1×3WDM (wavelength division multiplexer) 2 The com terminal is connected, and the two output terminals of 1×3WDM2 are respectively connected to the input terminal of the dual-channel APD photodetector 4, and the output terminals of the dual-channel APD photodetector 4 are respectively connected to the dual-channel data acquisition card 5, and the dual-channel data acquisition card 5 is connected to the computer 6 through a network cable; the pulsed light e...

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Abstract

The invention discloses a self-correction method capable of eliminating wavelength dispersion of a distributed Raman temperature measurement system and belongs to the technical field of optical fiber temperature detection. According to the method, the distributed fiber Raman temperature measurement system serves as a base, the speed of Stokes light and the speed of the anti-Stokes light are calculated respectively to calculate optical fiber distances corresponding to two channels of signals, then a Stokes light path data point serves as a reference, a data point which is minimum in error and corresponds to the Stokes light path data point in the one-to-one relationship is selected through query and comparison in anti-Stokes light path data, a ratio curve is corrected, and real temperature information can be obtained. By the aid of the method, the influence of chromatic dispersion on the temperature precision is eliminated, correction and compensation are conducted for all measurement points of an optical fiber, besides, only sampling data in the aspect of algorithms are required to be searched to find the optimal matching point to conduct comparison, the hardware system is not required to be corrected, and the method is convenient, simple and capable of greatly improving the temperature measurement precision.

Description

technical field [0001] The invention relates to a method for eliminating the influence of wavelength dispersion in a distributed Raman temperature measurement system. Specifically, in the collected data, the optical fibers corresponding to the Stokes light and the anti-Stokes light are selected to be close to each other. Data points to eliminate the adverse effects of dispersion on spatial resolution and temperature accuracy in distributed Raman thermometry systems. Background technique [0002] In recent years, the distributed optical fiber temperature measurement system based on Raman scattering has been developed rapidly and gradually commercialized. Compared with traditional electronic temperature sensors, the distributed optical fiber temperature measurement system has the advantages of anti-electromagnetic interference, high voltage resistance, high precision, and simple structure, so it is widely used in power cable temperature monitoring, structural health monitoring...

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Application Information

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IPC IPC(8): G01K11/32G01K15/00G01K11/324
Inventor 常军王宗良蒋硕黄庆捷王伟杰刘永宁孙柏宁王朋朋
Owner SHANDONG UNIV
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