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Cold and hot extension type fiber bragg grating temperature sensor

A technology of temperature sensor and fiber grating, which is applied in the field of optical sensing, can solve the problems of fiber grating chirp sensitivity, etc., and achieve the effects of improving response sensitivity, simplifying packaging device, and being easy to process

Pending Publication Date: 2022-02-25
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a cold and hot elongated fiber grating temperature sensor for the traditional fiber grating temperature sensor in the prior art, which is easy to cause chirp and low sensitivity when it is heated and compressed when it is cold.

Method used

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  • Cold and hot extension type fiber bragg grating temperature sensor
  • Cold and hot extension type fiber bragg grating temperature sensor
  • Cold and hot extension type fiber bragg grating temperature sensor

Examples

Experimental program
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Embodiment 1

[0037] Such as Figure 1-Figure 7As shown, a cold and hot elongated fiber grating temperature sensor is composed of a first mounting part 1 , a second mounting part 2 and an optical fiber 3 . The thermal expansion coefficients of the first mounting part 1 and the second mounting part 2 are different, the first mounting part 1 is provided with a gap 11, one end of the second mounting part 2 is fixedly connected with the first mounting part 1, and the other end of the second mounting part 2 A boss 21 is provided, and the boss 21 divides the notch 11 into two grating installation spaces. The optical fiber 3 is provided with a first fiber grating 31 and a second fiber grating 32, and the first fiber grating 31 is installed in the grating installation space on the left side of it. , the optical fibers at both ends of the first fiber grating 31 are respectively fixed on the first mount 1 and the boss 21, the second fiber grating 32 is installed in the grating installation space on t...

Embodiment 2

[0057] On the basis of Embodiment 1, this embodiment makes a further detailed description of each component of the sensor.

[0058] Such as Figure 4-Figure 5 As shown, the first mounting part 1 is a rectangular parallelepiped member as a whole, and the right side of the first mounting part 1 is provided with a gap 11, which is a rectangular through hole, and the left side of the first mounting part 11 is provided with a notch 12, the notch Depth H of 12 12 less than the depth H of the notch 11 1 (The depth H of the notch 11 1 That is, the height of the first mounting part 1), and the notch 12 communicates with the notch 11.

[0059] Such as Figure 6-Figure 7 As shown, the second mounting part 2 is an L-shaped structure, and the second mounting part 2 is composed of a flat plate and a boss 21, wherein the height H of the flat plate is 2 equal to the depth H of the notch 12 12 , the height H of the boss 21 21 equal to the depth H of the notch 11 1 . Therefore, when th...

Embodiment 3

[0068] In this embodiment, the second mounting part 2 is made of aluminum alloy, and the center wavelengths of the first fiber grating 31 and the second fiber grating 32 are 1544 nm and 1550 nm, respectively. Other components and the coupling relationship of the components are the same as in Embodiment 2.

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Abstract

The invention discloses a cold and hot extension type fiber bragg grating temperature sensor which is composed of a first installation part, a second installation part and an optical fiber, the thermal expansion coefficients of the first installation part and the second installation part are different, the first installation part is provided with a notch, one end of the second installation part is fixedly connected with the first installation part, and the other end of the second installation part is provided with a boss, the boss divides the notch into two grating installation spaces, the optical fibers are provided with a first fiber grating and a second fiber grating, the first fiber grating is installed in one grating installation space, the optical fibers at the two ends of the first fiber grating are fixed to the first installation part and the boss respectively, and the second fiber grating is installed in the other grating installation space, optical fibers at the two ends of the second fiber grating are fixed to the boss and the first installation part respectively. No matter in cold or hot, one of the fiber gratings is always in a suspended stretching state, so that chirp and initial large pre-stress are effectively avoided, the sensitivity is still kept at a high level, and the temperature measurement range is also doubled.

Description

technical field [0001] The invention relates to the technical field of optical sensing, in particular to a temperature sensor of cold and hot elongated optical fiber gratings. Background technique [0002] Permafrost refers to various rocks and soils below zero degrees Celsius and containing ice. Generally, it can be divided into short-term frozen soil (several hours / days to half a month), seasonal frozen soil (half a month to several months) and permafrost (several years to tens of thousands of years). Temperature is the most important physical quantity that distinguishes permafrost from other media, and its real-time and accurate acquisition is of great significance to the safety and health of road engineering in high-cold and high-altitude areas. From the current research status and results of permafrost temperature measurement at home and abroad, it can be found that the temperature sensors used generally use electromagnetic sensors, which have low measurement accuracy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/3206G01K1/14
CPCG01K11/3206G01K1/14
Inventor 高宏富志鹏赵力国禹大宽李琛乔学光
Owner XI'AN PETROLEUM UNIVERSITY
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