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High-precision FBG high-temperature sensor and working and manufacturing method thereof

A high-temperature sensor, high-precision technology, applied in the direction of instruments, thermometers, scientific instruments, etc., can solve the problems of sensor function and size, low reliability, low sensitivity, etc., to achieve the elimination of wavelength nonlinear drift and high temperature measurement accuracy , the effect of high reflected light power

Pending Publication Date: 2020-03-17
XIANGTAN UNIV +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the existing FBG temperature sensor technology is relatively mature, but in the field of high temperature, it still has defects such as low sensitivity, low reliability, and low precision.
Especially in high-tech fields such as aerospace, traditional sensors have been unable to meet the needs of the industry due to non-functional deficiencies such as function and size, so it is urgent to develop a high-precision sensor

Method used

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  • High-precision FBG high-temperature sensor and working and manufacturing method thereof
  • High-precision FBG high-temperature sensor and working and manufacturing method thereof
  • High-precision FBG high-temperature sensor and working and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Such as figure 1, a high-precision FBG high-temperature sensor, the sensor includes a bare optical fiber 2, a long packaging casing casing (301, 302), a third packaging casing casing 303, a first thermal insulation casing 401, a second thermal insulation casing 402, a High-temperature epoxy resin anchoring end 5, annular thermal insulation area 6, silicone rubber. The optical fiber passes through the second thermal insulation sleeve 402, and the outside of the position where the grating is located is filled with an annular thermal insulation area 6, and outside the annular thermal insulation area is an encapsulation casing sleeve (301, 302).

[0088] One end of the temperature measuring FBG202 and one end of the temperature compensation FBG201 are anchored together, and the other end is anchored to the movable packaging casing sleeve 303 through the second thermal insulation sleeve 402 through the silicon rubber temperature sensing area.

[0089] The temperature sensin...

Embodiment 2

[0092] A manufacturing method of a high-precision FBG high-temperature sensor includes fixing the FBG in a tube furnace, closing the tube furnace, inserting high-temperature cotton at both ends, and completing the annealing process.

Embodiment 3

[0094] Embodiment 2 is repeated, except that the temperature measurement area and the temperature compensation area are connected by high temperature resistant epoxy resin, and spot welding can also be used to connect the first packaging casing sleeve 301 and the second packaging casing sleeve 302 .

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Abstract

The invention provides a high-precision FBG high-temperature sensor and a working and manufacturing method thereof. The sensor comprises an optical fiber which is located at the center of the sensor and is provided with a first sensitization FBG for temperature compensation and a second sensitization FBG for temperature measurement in the axial direction of the optical fiber; and a packaging shellsleeve which coaxially sleeves outside the optical fiber. The high-precision FBG high-temperature sensor has relatively high sensitivity in a high-temperature environment, has good linearity within athreshold value and can meet most high-temperature monitoring working conditions in the fields of energy, spaceflight and the like.

Description

technical field [0001] The invention relates to the field of high-temperature monitoring equipment, in particular to a high-precision FBG high-temperature sensor and its working and manufacturing methods. Background technique [0002] Optical fiber sensor is a sensor that converts the state of the measured object into a measurable optical signal. Since the birth of optical fiber sensor, it has been widely used in many traditional sensing fields because of its advantages of anti-electromagnetic interference, intrinsic safety, small size, light weight and easy embedding into materials. [0003] As a new place for national science and technology to compete, the aerospace field is the best embodiment of the country's comprehensive strength in science and technology. With the implementation of the national "three-deep" strategy of deep ground, deep space, and deep sea, deep space has become the common development direction of various countries in the aerospace field. However, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/3206
Inventor 杨才千李帅杨国玉刘莲杨宁范丽唐人杰张旭辉许福
Owner XIANGTAN UNIV
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