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A fiber Bragg grating sensor paste method

A grating sensor, fiber optic Bragg technology, applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problems of sensor damage, insufficient strain transmission, poor repeatability, etc., to achieve stable strain sensitivity coefficient, ensure effectiveness and reliability , the effect of high strain transfer rate

Active Publication Date: 2016-06-22
CHINA AIRPLANT STRENGTH RES INST
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Problems solved by technology

However, due to the great difference in the structure and sensing principle of the fiber Bragg grating sensor and the resistive strain gauge, the effect of the existing pasting method in practical application is very unsatisfactory, and there are many defects, such as insufficient strain transmission, compression strain Problems such as inaccurate measurement, poor repeatability, unstable strain sensitivity coefficient, and easy damage to the sensor

Method used

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  • A fiber Bragg grating sensor paste method
  • A fiber Bragg grating sensor paste method

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Embodiment Construction

[0022] The present invention will be described in further detail below by means of specific embodiments:

[0023] The study found that the average strain transfer rate of the sensor decreases with the increase of the thickness of the adhesive layer, and increases with the increase of the bonding length, and the greater the elastic modulus of the adhesive layer, the greater the average strain transfer rate. Therefore, it is necessary to comprehensively consider various factors affecting the strain transfer, not only to ensure a high strain transfer rate, but also to ensure the consistency and stability of the strain sensitivity coefficient, and to make the sticking length as small as possible.

[0024] To ensure a high strain transfer rate, it is necessary to reduce the paste thickness and increase the paste length, but the paste length should not be too long. After analysis and test verification, the strain transfer rate is higher when the paste length is 20-25 mm. To ensure t...

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Abstract

The invention belongs to the application technology of optical fiber Bragg grating sensors, and relates to an installation method of optical fiber Bragg grating sensors. The present invention combines the analysis results of the strain transfer theory of the sensor, selects a variety of adhesives, uses different processes to paste the sensor, and conducts experimental verification on the paste effect through the standard beam test, and obtains that the strain transfer effect is ideal , Good repeatability and high stability fiber grating sensor pasting process. And by controlling the key factors affecting the strain transfer rate of the fiber Bragg grating sensor, such as the elastic modulus of the adhesive, the sticking length, and the thickness of the bonding layer, the fiber grating sensor is pasted, and the obtained fiber grating sensor has a high strain transfer rate and good repeatability , The strain sensitivity coefficient is stable, it can accurately measure the real strain of the monitoring point, and ensure the validity and reliability of the monitoring results of the fiber grating sensor.

Description

technical field [0001] The invention belongs to the application technology of optical fiber Bragg grating sensors, and relates to an installation method of optical fiber Bragg grating sensors. Background technique [0002] Fiber Bragg Grating sensor (Fiber Bragg Grating, FBG) is a kind of optical sensing element with excellent performance developed in recent years. Strain measurements in . Compared with conventional resistive strain gauges, the fiber grating sensor has the advantages of strong anti-electromagnetic interference and long-term stability, especially suitable for long-term monitoring of structural strain. When measuring strain, it is necessary to paste the fiber grating sensor on the structure under test, and the fiber grating sensor is a cylinder with a small diameter (125 μm). When pasting, there is a line contact between the sensor and the structure under test, which gives The pasting of the sensor brings difficulties, and the improper pasting method is like...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16F16B11/00
Inventor 黄博肖迎春白生宝贾淑红李野刘国强李明陈霞
Owner CHINA AIRPLANT STRENGTH RES INST
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