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Calculation method of distributed optical fiber-protective layer-pasting layer-substrate strain transfer

A technology of distributed optical fiber and protective layer, which is applied in the direction of using optical device to transmit sensing components, adopting optical device, converting sensor output, etc., can solve the problem that sensing optical fiber is not optical cable, etc., and achieve the effect of solving the problem of accurate mapping

Active Publication Date: 2022-04-05
HARBIN INST OF TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the process of applying distributed optical fiber sensing technology to the operation safety monitoring of actual civil engineering structures, in order to protect the sensing optical fiber from being damaged by changes in installation conditions and service environment, the surface of the optical fiber needs to be wrapped with a certain thickness of composite protective layer , that is, the sensing optical cable is formed; at the same time, the connection conditions and installation methods of the sensing optical cable and civil structures are often different due to different specific projects, resulting in the strain value of the sensing optical fiber test not being a true reflection of the actual strain of the base structure connected by the optical cable
In response to this problem, the present invention proposes a calculation method for distributed optical fiber-protective layer-adhesive layer-substrate strain transfer to solve the problem of accurate mapping between the test value of the distributed sensing optical cable and the actual strain of the substrate structure connected to the optical cable

Method used

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  • Calculation method of distributed optical fiber-protective layer-pasting layer-substrate strain transfer
  • Calculation method of distributed optical fiber-protective layer-pasting layer-substrate strain transfer
  • Calculation method of distributed optical fiber-protective layer-pasting layer-substrate strain transfer

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specific Embodiment approach 1

[0022] DETAILED DESCRIPTION figure 1 As shown, the present embodiment discloses a method of calculating a distributed optical fiber-protective layer-adhesive layer-matrix strain transmission, which includes the following steps:

[0023] Step 1: Determine the stiffness indicator of the fiber composite protective layer according to the distributed sensing cable section used, construct the shear relationship model of the core fiber and the composite protection layer, calculate the core fiber-composite protection layer strain transmission rate;

[0024] Step 2: Determine the thickness of the distributed sensing fiber optic cable to obtain the thickness and shear modulus of the distributed sensing fiber optic cable, calculate the composite protective layer-adhesive layer-matrix strain transmission rate based on delay theory;

[0025] Step 3: Depending on the site, the fiber-composite protective layer-adhesive layer-matrix model is established according to the on-site setting conditions...

specific Embodiment approach 2

[0027] DETAILED DESCRIPTION OF THE INVENTION 2: The present embodiment is a further description of the specific embodiments, and the calculation method of the core fiber-composite protection layer strain transmission rate is:

[0028] Step one by one: Taking the rigid layer (i.e., steel stranded pair) in the composite protection layer, the composite protective layer is divided into an inner protective layer-rigid layer-outer protective layer structure, and the layering determines the size and material parameters of each layer, The shear relationship model of the core fiber and the composite protection layer is shown in the formula (1),

[0029]

[0030] In r f To the core fiber axis to the core fiber - the radial distance of the inner protective layer interface, R i The radial distance of the core fiber axis to the internal protective layer - the radial distance of the rigid layer interface, τ f True stress at the core fiber - inner protective layer interface, ε f For the core f...

specific Embodiment approach 3

[0034] DETAILED DESCRIPTION OF THE INVENTION 3: The present embodiment is a further description of the specific embodiment, and the composite protective layer-adhesive layer-matrix strain transmission rate according to step b is:

[0035] Step 2: Determine the size and material properties of the sensing fiber optic cable adhesive layer, and construct a composite protective layer based on clarested theory based on the formula (3).

[0036]

[0037] In r s The radial distance of the core fiber axis to the rigid layer - the outer protective layer interface, R o The radial distance of the core optical fiber axis to the outer protective layer - the radial distance of the adhesive layer interface, R a The radial distance of the core fiber axis to the adhesive layer - the radial distance of the matrix interface, τ s Shear stress at the rigid layer - outer protective layer interface, ε s For the rigid layer, τ o,r For the outer protective layer, the shear stress of a side of the optical...

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Abstract

The calculation method of distributed optical fiber-protection layer-pasting layer-substrate strain transfer belongs to the field of intelligent monitoring of civil engineering structure operation safety. According to the cross-sectional parameters of the distributed sensing optical cable, the shear relationship model between the core optical fiber and the composite protective layer is constructed, and then the strain transfer rate of the core optical fiber-composite protective layer is calculated; according to the field layout conditions of the distributed sensing optical cable, the calculation is based on Composite protective layer-adhesive layer-substrate strain transfer rate of shear lag theory; establishment of optical fiber-composite protective layer-adhesive layer-matrix numerical model of distributed optical fiber sensing, and corrected optical fiber-composite protective layer-adhesive layer-matrix The strain transfer rate of the optical fiber-composite protective layer-adhesive layer-substrate is obtained by inductively analyzing the statistical characteristics of the parameters of the optical cable adhesive layer, and considering the influence of optical cable construction and installation factors. The invention solves the problem of precise mapping between the test value of the sensing optical cable and the actual strain of the matrix structure connected with the optical cable.

Description

Technical field [0001] The present invention belongs to the field of operation safety intelligence monitoring of civil engineering structures, in particular to a computational method of distributed optical fiber-protective layer-adhesive layer-matrix strain transmission. Background technique [0002] Long-scale civil structural use periods, in its own service period, it is impact on factors such as environmental corrosion, material aging, and load, so that its ability to work. Once these structures lose their work, it will bring huge losses. The consequences are unimaginable. Therefore, long-term monitoring of large civil engineering structures, timely diagnosis and discovery, and eliminate potential hidden dangers. Since the civil engineering structure is often huge, the degree of freedom is numerous, there is an urgent need for an effective sensing technique. The fiber has a simultaneous sensing and transmission information, the long distance transmission loss is low, not being...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01D5/353
CPCG01B11/16G01D5/35383
Inventor 刘洋徐乾恩李虎门燕青黄永亮
Owner HARBIN INST OF TECH