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Distributed optical fiber sensing method

An optical fiber sensing and distributed technology, applied in the direction of using optical devices to transmit sensing components, can solve problems such as poor accuracy, and achieve the effects of high accuracy, reducing errors and reducing interference

Pending Publication Date: 2019-06-28
南京智慧基础设施技术研究院有限公司 +1
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the technical problem of poor precision existing in the prior art

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  • Distributed optical fiber sensing method
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  • Distributed optical fiber sensing method

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Embodiment 1

[0037] This embodiment provides a distributed optical fiber sensing method. The distributed optical fiber sensing method is to send optical fiber sensing signals in a distributed manner, and multiple optical fiber sensing signal receivers receive the same optical fiber sensing signal synchronously. ,Such as figure 1 , and proceed as follows:

[0038] Step 1, set G1 optical fiber sensing signal receivers to receive the same optical fiber sensing signal for synchronous reception, define and extract at least two characteristic parameters representing the interference signal, and normalize all the characteristic parameters, G1 is greater than positive integer of 1;

[0039] Step 2, define the weight values ​​of the characteristic parameters respectively, and use the machine integrated learning algorithm to optimize the characteristic parameters representing the interference signal in step 1, and obtain the characteristic parameter combination with the largest weight ratio;

[00...

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Abstract

The invention relates to a distributed optical fiber sensing method, thereby solving a technical problem of low accuracy. A plurality of optical fiber sensing signal receivers receive optical fiber sensing signals asynchronously, at least two characteristic parameters representing an interference signal are extracted and all characteristic parameters are normalized; weight values of the characteristic parameters are defined and the characteristic parameters representing an interference signal in the step one are optimized to obtain a characteristic parameter combination unit with the largest weight ratio; with the characteristic parameter combination unit with the largest weight ratio as an input quantity of an SVM function, an interference signal recognition model is constructed, m filters are used for carrying out framing and the starting frequency of the kth filter is used as the center frequency of the (k-1)th filter; a unit signal after framing is inputted into the interference signal recognition model; and a recognized signal frame with the interference signal is denoised to obtain final sensing data. Therefore, the problem is solved and method can be applied to the optical fiber sensing technology.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a distributed optical fiber sensing method. Background technique [0002] Distributed optical fiber sensor is a sensor that uses unique distributed optical fiber detection technology to measure or monitor the spatial distribution and time-varying information along the optical fiber transmission path. It arranges the sensing fiber along the field, and can obtain the spatial distribution and time-varying information of the measured field at the same time, which is attractive for many industrial applications. [0003] The principle of distributed optical fiber sensing system is to use optical fiber as the sensing sensitive element and transmission signal medium at the same time, and adopt advanced OTDR technology and OFDR technology to detect the temperature and strain changes at different positions along the optical fiber to realize truly distributed measurement . The princip...

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Application Information

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IPC IPC(8): G01D5/353
Inventor 方达吴智深唐永圣张浩
Owner 南京智慧基础设施技术研究院有限公司
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