Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber

A multi-core, few-mode, sensing system technology, applied in the field of sensing systems, can solve the problems of not being able to accurately reflect environmental parameters in real time, not being able to obtain changes in environmental parameters, and insufficient information, so as to improve sensing sensitivity and accuracy Accuracy, the realization of measurement data volume, and the effect of improving accuracy

Inactive Publication Date: 2020-09-15
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, a single optical fiber can only measure one set of data at the same time, and in the long-distance sensing measurement, due to the influence of noise, the amount of information measured at the same time may be insufficient, resulting in the inaccurate environment parameter

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  • Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber
  • Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber
  • Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber

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[0022] The technical scheme of the present invention will be further described below in conjunction with the drawings.

[0023] In this embodiment, the optical fiber is a multi-core and few-mode optical fiber, the number of cores is at least 3, and the total number is x; at least one port at both ends of the core is connected to a demodulation device based on Rayleigh scattering technology, and one port is labeled i, i=1,4,……, corresponding to the other port marked as i', i'=x+1,x+4,……; at least one port at both ends of the core is connected to a demodulation device based on Raman scattering technology, The port is marked as j, j=2,5……, and the corresponding other port is marked as j', j'=x+2,x+5,……; at least one port connection at both ends of the core is based on spontaneous or stimulated deployment The demodulation device of the Liyuan scattering technology, the port is marked as n, n=3,6……, and the corresponding port is marked as n', n'=x+3,x+6,…….

[0024] The corresponding t...

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Abstract

The invention discloses a bidirectional distributed sensing system and method based on a multi-core few-mode optical fiber. The system comprises laser light sources, couplers, three demodulation devices and signal processing units, wherein the laser light sources, the couplers and the three demodulation devices are arranged at two ends of each optical fiber respectively, and the signal processingunits are arranged behind the demodulation devices. The laser light sources and the demodulation devices are connected to the couplers in parallel; and the optical fibers are multi-core few-mode optical fibers. The number of the fiber cores is at least three, ports at two ends of at least one fiber core are connected with the demodulation device based on a Rayleigh scattering technology, the portsat two ends of at least one fiber core are connected with the demodulation device based on a Raman scattering technology, and the ports at two ends of at least one fiber core are connected with the demodulation device based on a spontaneous or stimulated Brillouin scattering technology. In the invention, each core can be used as an independent bidirectional sensing channel, which is different from the multi-time measurement of a single-core optical fiber, multiple groups of data of multiple groups of parameters can be measured at the same time, and measurement accuracy is improved while multiple sensing is realized.

Description

technical field [0001] The invention relates to a sensing system and method, in particular to a bidirectional distributed sensing system and method based on multi-core few-mode optical fibers. Background technique [0002] Optical fiber sensing technology is a new type of sensing technology that uses optical fiber as a carrier to perceive and transmit external measured parameters. Compared with traditional electrical sensors, optical fiber sensing has many advantages such as portability, insulation, anti-electromagnetic interference and radiation, strong reusability, multiple measurement objects, and adaptability to complex environments with high temperature and high pressure. Due to its many advantages, fiber optic sensing technology has received great attention since its appearance, and has aroused the interest of researchers in various fields. Fiber optic sensing technology is divided into point-type fiber-optic sensing and distributed fiber-optic sensing. Point-type fib...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35364
Inventor 刘博忻向军吴泳锋毛雅亚南通王瑞春沈磊李良川周锐王光全任建新孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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