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High-temperature resistant FBG (fiber bragg grating) sheet type strain sensor and manufacturing method thereof

A strain sensor, fiber grating technology, applied in the direction of cladding fiber, optical waveguide light guide, instruments, etc., can solve the problems of poor stability and reliability, distortion of results, cumbersome instruments, etc., to achieve good stability and durability, and convenient construction. The effect of high operation and measurement accuracy

Inactive Publication Date: 2012-08-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Under high temperature conditions, when monitoring the strain of structural components, traditional sensors have many shortcomings: (1) Electromagnetic sensors have poor linearity, poor anti-interference performance to electromagnetics, relatively bulky instruments, poor stability and reliability, and cannot be used for a long time. Provide accurate monitoring information stably and in a timely manner; (2) Traditional resistance strain gauges are greatly affected by the environment. Due to the influence of temperature drift and zero temperature, the results of long-term strain tests will be seriously distorted, and there are problems of difficult layout

Method used

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  • High-temperature resistant FBG (fiber bragg grating) sheet type strain sensor and manufacturing method thereof
  • High-temperature resistant FBG (fiber bragg grating) sheet type strain sensor and manufacturing method thereof
  • High-temperature resistant FBG (fiber bragg grating) sheet type strain sensor and manufacturing method thereof

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Embodiment 1

[0016] Example 1: Combination figure 1 , The high temperature resistant fiber grating sheet strain sensor of the present invention is composed of multiple fiber gratings (1), multiple polyimide films (2), armored optical cables (3) and optical fiber connectors (4), Fiber grating (1) is connected to polyimide film (2), armored optical cable (3) is connected to fiber grating (1), fiber connector (4) is connected to armored optical cable (3), fiber grating (1) and polyimide The number of amine films (2) can be determined according to the number of points to be monitored.

[0017] The preparation method, the steps are as follows:

[0018] Step 1: Using the polyimide curing process, the fiber grating and polyimide are sealed in the mold, and the three processes of heating, curing, and cooling are organically integrated to process the formed polyimide and fiber grating composite sheet;

[0019] Step 2: Lead the armored optical cable from the end of the polyimide and fiber grating composit...

Embodiment 2

[0021] Example 2: Combination figure 2 The invention includes the following structural features: 1. The optical fiber grating is directly encapsulated by polyimide material; 2. The optical fiber grating is led out through an armored optical cable at the end of the polyimide and optical fiber grating composite sheet. In the present invention, the fiber grating is centrally encapsulated in the polyimide film, which can ensure the adhesion between the grating and the encapsulating material. The invention has the following characteristics: the polyimide curing process is adopted, the fiber grating and polyimide are sealed in the mold, and the three processes of heating, curing and cooling are organically integrated, and the formed polyimide and fiber grating are composite The specific steps are as follows: Step 1: Mold: Quartz glass (1) is the bottom plate, Quartz glass (2) is pasted on the Quartz glass (1), the fiber clamp (3) is fixed on the Quartz glass (2), and the quartz glas...

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Abstract

The invention discloses a high-temperature resistant FBG (fiber bragg grating) sheet type strain sensor and a manufacturing method thereof. The strain sensor consists of an FBG, a polyimide film, an armored cable and an optical fiber connector, wherein the FBG is connected with the polyimide film; the armored cable is connected with the FBG; the optical fiber connector is connected with the armored cable; and when the strain of a structural component is monitored, the surface of the monitored object needs to be milled by abrasive paper, and the polyimide and FBG composite sheet is stuck on the monitored object with adhesives. The method adopts a polyimide curing technology and comprises the following steps of: sealing the FBG and polyimide into a mould, and organically combining through heating, curing and cooling to form a polyimide and FBG composite sheet; leading out the armored cable from the end part of the polyimide and FBG composite sheet; and sticking the polyimide and FBG composite sheet on the surface of the structural component to be monitored by use of high-temperature resistant adhesives. The strain sensor disclosed by the invention resists high temperature, has good durability and high measurement accuracy, and is in quasi-distributed arrangement, free from electromagnetic interference and convenient to construct.

Description

Technical field [0001] The invention relates to a strain monitoring sensor element, in particular to a high temperature resistant fiber grating sheet strain sensor and a preparation method thereof. Background technique [0002] In 1978, Hill of Canada invented the phenomenon of light-induced refractive index changes in germanium-doped fiber, which made the in-core grating come out. In 1989, Meltz in the United States invented the UV-side writing technology of germanium-doped fiber gratings. People can use this technology to easily produce fiber gratings with various constants, which greatly reduces the cost and lays the foundation for its wide application. The main advantages of fiber grating for sensing are reflected in: it can avoid electromagnetic field interference, good electrical insulation; not affected by humid environment; good durability, resistance to various harsh environments including high temperature (less than 600℃) and Chemical corrosion ability, with the abilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G02B6/02
Inventor 王川刘军龙邱慧芳谷守杰
Owner HARBIN INST OF TECH
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