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Distributed sensing method for multi-core optical fiber

A technology of multi-core optical fiber and sensing method, which is applied in the direction of measuring devices, instruments, etc., can solve the problems of decreased accuracy, decreased system reliability, and low accuracy, so as to improve accuracy and precision, broaden the sensing dimension, and improve accuracy. degree of effect

Active Publication Date: 2013-12-11
JIANGSU JINDI ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1. In long-distance sensing, the attenuation of backscattered light will become very serious, even submerged in noise, which greatly limits the sensing distance, and is prone to errors, resulting in decreased accuracy and reduced system reliability.
In order to improve the signal-to-noise ratio of the system, the pulse width can be increased to increase the power into the fiber, but increasing the pulse width will result in a decrease in spatial resolution
In addition, in order to reduce the occurrence of misjudgment events caused by the degradation of signal-to-noise ratio, measures are often taken to measure multiple times to eliminate errors and improve accuracy, but this is at the cost of sacrificing time, and some physical quantities are slightly manipulated. passed away, this is also a big criticism
[0006] 2. It is all realized in a single-core optical fiber. Using an optical fiber with a single core, only one set of sensing data can be obtained for a certain event at the same time. In long-distance sensing, it is affected by noise, due to Insufficient single-sensing information may cause misjudgment, and multiple measurements may miss the capture of environmental parameter changes due to midway delays, resulting in low accuracy and poor reliability.

Method used

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  • Distributed sensing method for multi-core optical fiber
  • Distributed sensing method for multi-core optical fiber
  • Distributed sensing method for multi-core optical fiber

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Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 2 As shown, all the cores at one end of the multi-core optical fiber 1 are used as independent channels, and signals are injected into all cores at the same time for synchronous sensing. For example, the core ports 11, 12, 13, 14, 15, 16, and 17 at one end of a seven-core fiber are used as input ports, and the core ports 11, 12, 13, 14, 15, 16, and 17 at the other end are connected to the One-to-one corresponding output ports, each fiber core can independently obtain a set of sensing data.

Embodiment 2

[0030] Such as image 3As shown in Fig. 1 , some core ports at both ends of the multi-core optical fiber 1 are respectively selected as input ports, and the remaining core ports of the same single core are used as output ports, bidirectional and each channel is independently sensed. For example, if you choose to use the core ports 11, 13, 14, and 16 at one end of the seven-core fiber as the input ports, the output ports are respectively the core ports 21, 23, 24, and 26 at the other end, and the core ports 22, 25, and 27 are selected for the other end. As the input port, the corresponding output port is the fiber core port 12, 15, 17 at one end, that is, the sensing path of each channel is the fiber core port 11→21; the fiber core port 13→23; the fiber core port 14→24 ; core port 16→26; core port 22→12; core port 25→15;

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Abstract

The invention discloses a distributed sensing method for a multi-core optical fiber in the field of optical fiber sensing and measuring. The multi-core optical fiber is provided with n fiber cores, wherein n is larger than 2. Two ports of the n fiber cores are used as an input port or an output port, and n parallel channels with n input ports and n output ports are formed and sense n sets of data in a one-way mode or two-way mode. According to the distributed sensing method for the multi-core optical fiber, each core is used as an independent sensing channel, the effect is similar to that of multiple measurements, long-distance sensing distribution is finished, multiple and multidimensional sensing is achieved at the same time, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and measurement, in particular to an optical fiber sensing method for an optical fiber sensor, which uses optical fiber space division multiplexing technology to realize distributed sensing of environmental parameters such as temperature, strain, and pressure. the Background technique [0002] A multi-core fiber is a fiber with multiple single cores in a single cladding. The space-division multiplexing of a multi-core fiber is to divide the light beam into multiple sensing channels along space in one fiber. Through space-division multiplexing, in the fiber Each point on the link is used as a sensing element, and the sensing length can reach tens of kilometers. It can continuously measure the environmental parameters distributed along the length of the optical fiber to realize distributed optical fiber sensing. [0003] Traditional distributed optical fiber sensing technologies mainly include:...

Claims

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Application Information

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IPC IPC(8): G01D21/02
Inventor 赵志勇沈平付松年唐明周金龙朱冬宏
Owner JIANGSU JINDI ELECTRONICS TECH