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Dual-sensitization high-sensitivity FBG temperature sensor and manufacturing method thereof

A temperature sensor, high-sensitivity technology, used in thermometers, thermometers, instruments, etc. with physical/chemical changes, it can solve the problems of long reaction time, poor sensitivity, and inability to achieve rapid and accurate measurement, and achieve response The effect of short time, long service life and rapid response to external temperature changes

Active Publication Date: 2021-07-16
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple structure, but the sensitivity enhancement effect is not good, and the response time is long, so it is impossible to achieve fast and accurate measurement

Method used

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  • Dual-sensitization high-sensitivity FBG temperature sensor and manufacturing method thereof
  • Dual-sensitization high-sensitivity FBG temperature sensor and manufacturing method thereof

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] see figure 1 with figure 2 , the embodiment of the present invention includes a metal shell 1, a metal pipe 2, a thermally conductive colloid 3, an optical fiber grating 4, and a high thermal expansion coefficient colloid 5; the thermally conductive colloid 3 adopts PDMS glue or epoxy resin glue;

[0032] The metal shell 1 is cylindrical with thermal conductivity; the metal tube 2 has thermal conductivity, and the outer diameter of the metal tube 2 is smaller than the inner diameter of the metal shell 1;

[0033] Two metal tubes 2 are inserted into the metal shell 1 from both ends of the metal shell 1 and bonded and nested on the inner wall of the metal shell 1 by the thermally conductive colloid 3, and the gap between the metal tube 2 and the metal shell 1 is filled with the thermally conductive colloid 3 The distance betwe...

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Abstract

The invention provides a double-sensitization high-sensitivity FBG temperature sensor and a manufacturing method thereof, and the sensor comprises three cylindrical metal tubes, one of the cylindrical metal tubes is a metal housing, the inner diameter of the cylindrical metal tube is slightly larger than the outer diameters of the other two metal tubes, and the middle part of the cylindrical metal tube is provided with a plurality of through holes. Two small metal tubes are connected through epoxy resin glue and embedded into a large metal shell by a certain depth, so that a section of cavity exists in the metal shell, four through holes are formed in the cavity of the metal shell, and the fiber bragg grating is installed in the three metal tubes which are connected in series through glue in a bonding mode. The grating is coated with colloid with a high thermal expansion coefficient; and the high thermal expansion characteristic of the organic polymer on the outer side of the FBG and the influence of thermal expansion and contraction of the metal on the central wavelength are utilized to realize dual temperature sensitization of the FBG, and the response speed and the sensitization effect of the FBG temperature sensor are improved.

Description

technical field [0001] The invention belongs to the technical field of temperature detection, and in particular relates to a double-sensitization high-sensitivity FBG temperature sensor and a manufacturing method. Background technique [0002] As an all-fiber device, Bragg grating (FBG for short) has been more and more widely used in the fields of optical fiber communication and optical fiber sensing. FBG sensor has significant advantages such as anti-electromagnetic interference, corrosion resistance, long service life, small size, and can realize multi-point distribution measurement by optical wavelength multiplexing, so it plays a huge role in occasions where traditional sensors cannot be used. In recent years, with the continuous development of FBG sensing technology, its application range is also expanding, and it has begun to replace traditional sensing systems in some fields. [0003] Since unpackaged fiber gratings are easily damaged, fiber gratings used as sensors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/3206
CPCG01K11/3206
Inventor 童晓玲骆丙铈宋力勰徐其伟
Owner WUHAN UNIV OF TECH
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