Double-F-shaped fiber grating temperature sensor

A temperature sensor and fiber grating technology, applied in the field of optical sensing, can solve the problems that fiber grating temperature sensors are difficult to achieve large range and high sensitivity at the same time, and achieve the effects of avoiding chirp problems, improving sensitivity, and simple structure

Pending Publication Date: 2022-02-15
CCCC FIRST HIGHWAY CONSULTANTS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a double F-shaped fiber grating temperature sensor with simple structure, large range and high sensitivity in view of the problem that the fiber grating temperature sensor in the prior art is difficult to realize large range and high sensitivity at the same time

Method used

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  • Double-F-shaped fiber grating temperature sensor
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  • Double-F-shaped fiber grating temperature sensor

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Experimental program
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Effect test

Embodiment 1

[0027] Such as Figure 1-Figure 3 As shown, the first fiber grating 4 and the second fiber grating 5 written on the same optical fiber 2 are slightly prestressed and then packaged between two adjacent pairs of end points of two F-shaped structural members 1 to form a double F-shaped fiber grating temperature sensor. The thermal expansion coefficients of the two F-shaped structural members 1 have a large difference. The two F-shaped structural members 1 are arranged symmetrically about the center, and the middle parts of the two F-shaped structural members 1 are fixedly connected. The head end beam 11 of one F-shaped structural member 1 A gap 3 is formed between a tail end 12 of another F-shaped structural member 1, and the first fiber grating 4 and the second fiber Bragg grating 5 are suspended in the gap 3, respectively.

[0028] When the temperature of the environment where the sensor is located changes, on the one hand, due to the thermal expansion effect of the fiber mate...

Embodiment 2

[0049] This embodiment further details the structure of embodiment 1. Specifically, in this embodiment, the double F-shaped fiber grating temperature sensor includes two F-shaped structural members 1, optical fibers 2, a first fiber grating 4, a second Fiber grating 5 and threaded joint 6.

[0050] Such as image 3 As shown, the two F-shaped structural members 1 are both F-shaped structures with the same size, opposite end to end, but different materials. Each F-shaped structural member 1 includes a head end beam 11 , a tail end 12 and a middle beam 13 , wherein the tail end refers to the tail end point of the vertical bar connecting the head end beam 11 and the middle beam 13 . Wherein, gaps 3 are respectively formed between the head beam 11 of one F-shaped structural member 1 and the tail end 12 of the other F-shaped structural member 1 , and the lengths of the two gaps 3 are equal. The intermediate beams 13 of the two F-shaped structural members 1 are fixedly connected th...

Embodiment 3

[0056] In this embodiment, the F-shaped structural member 1 on the left is made of stainless steel, and the center wavelengths of the second fiber grating 5 and the first fiber grating 4 are 1550 nm and 1544 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 double-F-shaped fiber grating temperature sensor, which comprises two F-shaped structural members and an optical fiber, wherein the thermal expansion coefficients of the two F-shaped structural members are different, the two F-shaped structural members are arranged in a central symmetry manner, the middle parts of the two F-shaped structural members are fixedly connected, and a gap is formed between the head end cross beam of each F-shaped structural member and the tail end of the other F-shaped structural member. The optical fiber is provided with a first optical fiber grating and a second optical fiber grating, wherein the first optical fiber grating and the second optical fiber grating are located at the two gaps respectively, and the optical fibers on the two sides of the optical fiber gratings are fixedly connected with the head end cross beam of one F-shaped structural part and the tail end of the other F-shaped structural part respectively. The two F-shaped structural members have a large thermal expansion coefficient difference, and the relative displacement change, caused by the temperature, of the two F-shaped structural members is converted into the strain change of the fiber bragg grating, so that the sensitivity of the temperature sensor is improved. When the temperature rises and drops, the central wavelength change of one fiber grating is used for detection, and the measurement range is doubled.

Description

technical field [0001] The invention relates to the technical field of optical sensing, in particular to a double F-shaped optical fiber grating temperature sensor. Background technique [0002] At present, electrical temperature sensors are most commonly used in temperature measurement, such as thermocouples and thermistor temperature sensors, but these sensors are susceptible to electromagnetic interference, poor measurement accuracy, short life, unable to transmit long distances and cannot be connected in series. Network and other shortcomings. Fiber Bragg grating temperature sensor has attracted widespread attention and great interest due to its many advantages such as anti-electromagnetic interference, anti-corrosion, high sensitivity, strong reusability, small size, light weight, and easy to embed into materials. [0003] Fiber Bragg Grating itself has temperature sensitivity characteristics, and its temperature sensitivity is about 10pm / ℃ without any encapsulation en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 赵力国高宏富志鹏冯德全李震乔学光
Owner CCCC FIRST HIGHWAY CONSULTANTS
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