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Inside heated FBG sensor and packaging method thereof

A packaging method and sensor technology, which are applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problem that the accuracy of monitoring results is not well guaranteed, the sensitivity of temperature and strain factors, and the influence of FBG temperature monitoring. and other problems, to achieve the effects of excellent thermal stability and thermal conductivity, simple layout and high rigidity

Active Publication Date: 2017-07-25
SUZHOU NANZEE SENSING TECH +1
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Problems solved by technology

However, according to the Bragg equation of fiber gratings, FBG is sensitive to temperature and strain factors at the same time, that is, if the interference of strain factors is not eliminated, it will affect the FBG temperature monitoring
Carbon fiber rods have low hardness and rigidity, and are prone to bending strain when squeezed. Therefore, using them to encapsulate FBG sensing elements cannot really protect FBG from external force and strain, and the accuracy of monitoring results remains the same. not well guaranteed

Method used

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  • Inside heated FBG sensor and packaging method thereof
  • Inside heated FBG sensor and packaging method thereof

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Embodiment Construction

[0024] Such as Figure 1-2 As shown, in the embodiment, a double-hole corundum tube with a length of 10 cm, a diameter of 4 mm, a hole diameter of 1 mm, and a hole distance of 1 mm is taken as an example for illustration.

[0025] An internal heating FBG sensor, comprising a corundum tube body 5, an optical fiber lead wire 2, a heating resistance wire 4 and an FBG sensor 3, two holes are arranged on the corundum tube body 5, and an optical fiber lead wire 2 is provided at both ends of the FBG sensor 3 and The FBG sensor 3 is arranged in one of the holes, and the heating resistance wire 4 is arranged in the other hole. The other end of the optical fiber lead 2 is wrapped with a lead sheath 1 to protect the FBG sensor 3 . Both ends of the corundum tube body 5 are provided with heat-shrinkable tubes 6 . Used to prevent leakage and waterproof.

[0026] Wherein, both channels are cylindrical channels.

[0027] The packaging method of the internal heating FBG sensor in this embo...

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Abstract

The invention provides an inside heated FBG sensor and a packaging method thereof. The inside heated FBG sensor comprises an alundum tube body, optical fiber leads, a heating resistance wire and an FBG sensor, and is characterized in that the alundum tube body is provided with a plurality of ducts, both ends of the FBG sensor are provided with the optical fiber leads, the FBG sensor is arranged in one of the ducts, and the heating resistance wire is arranged in the other ducts. According to the invention, moisture field data measured by the sensor is enabled to be all based on a temperature field to the maximum extent, so that the interference imposed on a measurement result by strain factors is reduced to the lowest; and the porous alundum tube is internally provided with the heating resistance wire, so that an inside heating function of an alundum tube FBG rock and soil mass moisture field monitoring sensor is realized.

Description

technical field [0001] The invention relates to the field of optical fiber sensor and its production and packaging, and proposes an internal heating system that can be applied to the monitoring of moisture fields (moisture content ω, seepage rate ν) in various sites such as geological rock and soil bodies, agricultural soils, and industrial waste landfills. Corundum tube FBG sensor (Inside heated Alundum Tube, hereinafter referred to as IHAT-FBG). Background technique [0002] Moisture content ω and seepage rate ν are the most important indicators of water field, and also the most basic physical parameters of geological rock and soil mass, agricultural soil, industrial waste landfill and other sites. For example, when it comes to the analysis of various environmental geotechnical engineering problems, such as dike collapse, land subsidence, unstable landslide, crop growth and health analysis, pollutant migration investigation in landfill, etc., it is often necessary to conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D21/02
CPCG01D5/35312G01D21/02G01N33/245
Inventor 孙鑫段超喆苗鹏勇梅世嘉
Owner SUZHOU NANZEE SENSING TECH
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