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Decoding algorithm of optical fiber Raman temperature sensing system based on relevant pulse code

A sensing system and pulse coding technology, applied in the field of optical fiber sensing, can solve the problems of large computational load and low reliability.

Inactive Publication Date: 2015-04-29
HEFEI UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a decoding algorithm for an optical fiber Raman temperature sensing system based on correlation pulse coding, so as to solve the problem that the traditional discrete linear correlation algorithm in the prior art optical fiber Raman temperature sensing system has a large amount of computation and is reliable. low sex problem

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  • Decoding algorithm of optical fiber Raman temperature sensing system based on relevant pulse code
  • Decoding algorithm of optical fiber Raman temperature sensing system based on relevant pulse code
  • Decoding algorithm of optical fiber Raman temperature sensing system based on relevant pulse code

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Embodiment Construction

[0031] like figure 1 As shown in the figure, the decoding algorithm of the optical fiber Raman temperature sensing system based on correlation pulse coding first uses the overlap-and-save method to segment the received two sets of bipolar Raman scattering signals, and then divides each segment The segment signal and the Golay pulse code sequence are subjected to FFT-based circular correlation calculation, and the correlation results of each segment are combined in chronological order, and finally the two sets of calculation results are correspondingly superimposed to complete the denoising process of the entire system, including the following steps:

[0032] (1) Sampling the Raman scattering signal.

[0033] Inject Golay unipolar detection pulse sequence A into the sensing fiber successively + 、A - 、B + 、B - , the corresponding Raman scattering signal a is obtained after real-time collection by the detection module + 、a - , b + , b - . let a=a + -a - , b=b + -b - ...

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Abstract

The invention discloses a decoding algorithm of an optical fiber Raman temperature sensing system based on a relevant pulse code. Aiming at the problem that in the prior art, conventional decoding operation is low in calculating efficiency and large in storage space, the decoding algorithm comprises the following steps: firstly, carrying out segment treatment on two groups of bipolar Raman scattering signals received by virtue of an overlap-save method, respectively; carrying out an FFT-based cyclic correlated operation on the segmented signals and a Golay pulse coding sequence on the basis and sequentially combining the related results according to a time sequence; and finally, correspondingly overlaying the two operating results to accomplish the noise-removal process of the whole system.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a decoding algorithm for an optical fiber Raman temperature sensing system based on correlation coding, with the purpose of improving decoding efficiency and reducing storage space. Background technique [0002] Optical fiber Raman temperature sensing system is a distributed optical fiber sensing system that uses spontaneous Raman scattering effect to measure temperature and optical time domain reflection technology to locate. It has real-time, reliability, safety, corrosion resistance, distributed, Anti-electromagnetic interference and other advantages have been widely used in fire detection, electric power, transportation and other fields. However, in the optical fiber Raman temperature sensing system, since the spontaneous Raman scattered light is very weak, the signal-to-noise ratio of the system is low, which greatly restricts its spatial resolution and measu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 姜海明曹文峰谢康江海峰
Owner HEFEI UNIV OF TECH
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