Calibration method and device of embedded-type long-distance optical fiber sensor

A technology of long-distance optical fiber and calibration method, which is applied in the direction of using optical devices, measuring devices, instruments, etc., and can solve the problems of unusable parameter indicators and other problems

Inactive Publication Date: 2010-05-26
ZHEJIANG UNIV
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Problems solved by technology

This invention requires the sensing optical fiber to be firmly pasted on the surface of the equal-strength beam, and the diameter of the embedded long-dist

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  • Calibration method and device of embedded-type long-distance optical fiber sensor
  • Calibration method and device of embedded-type long-distance optical fiber sensor
  • Calibration method and device of embedded-type long-distance optical fiber sensor

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Embodiment Construction

[0041] In this embodiment, the aluminum-plastic tube composite tube with a diameter of 16mm in the microtube, the sensing fiber is a 4mm tight-buffered fiber, and the embedded long-distance sensing fiber uses cement slurry poured into the microtube as a bonding layer to fix the sensing fiber. Structural and mechanical models such as figure 1 shown. The embedded optical fiber sensor is a multi-layer interface transfer model, but the elastic modulus of the cement slurry filling layer d in this model is similar to the elastic modulus of the fiber core a and the matrix material, so the optical fiber coating is required when the structural strain is transmitted to the fiber core Elastic modulus of layer b, cladding c and microtube e. The strain is transmitted between the layers through shear force. According to the common shear lag theory and assuming that the layers are deformed synchronously, the relationship between the optical fiber strain and the matrix strain can be obtained...

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Abstract

The invention discloses a calibration method of an embedded-type long-distance optical fiber sensor. The calibration method comprises the following steps of: (A) embedding tensed micro-pipes and pressed micro-pipes along the length direction of a reinforced concrete beam; (B) respectively pasting resistance-type strain gauges on the surface of tensed reinforced concrete bars and pressed reinforced concrete bars; (C) casting the reinforced concrete beam; penetrating sensor optical fibers to be calibrated; (D) pasting a resistance-type strain gauge on the outer surface of the reinforced concrete beam; (E) applying a load to the midspan of the reinforced concrete beam; (F) collecting the stress data of the optical fibers under every load level and comprehending temperature; (G) collecting the stress data of all the resistance-type strain gauges under every load level; and (G) fitting the data acquired by the step (F) and the step (G) to acquire the stress transfer coefficient of the sensor optical fiber to be calibrated. The invention can calibrate the embedded-type long-distance optical fiber sensor formed by the tensed micro-pipes in different pipe diameters and the sensor optical fibers of different types and realize the accurate measurement of structural stress.

Description

technical field [0001] The invention relates to the field of civil engineering health monitoring, in particular to a calibration method and device for an embedded long-distance optical fiber sensor. Background technique [0002] Engineering structures such as bridges, dams, tunnels, pipelines, etc., will inevitably suffer damage such as reduced bearing capacity and excessive deformation due to adverse factors such as environmental loads and material performance degradation during their service period. Engineering structures, especially large structures, have the characteristics of uncertain damage locations and complex environmental conditions. Traditional monitoring methods such as electrical resistance strain gauges and steel string strain gauges are difficult to achieve comprehensive and long-term strain monitoring of structures. Distributed optical fiber sensing technology based on Brillouin frequency shift has the characteristics of distributed, long-distance, high prec...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 金伟良何勇毛江鸿
Owner ZHEJIANG UNIV
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