Multi-substrate high-sensitivity optical fibre grating temperature sensor

A technology of temperature sensor and optical fiber grating, which is applied in the field of sensors to achieve the effects of strong anti-electromagnetic interference, fast response time, and high temperature sensitivity

Inactive Publication Date: 2008-07-09
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the fiber grating temperature sensors at home and abroad cannot meet the requirements of high temperature measurement accuracy, wide application range and good repeatability in production practice.

Method used

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  • Multi-substrate high-sensitivity optical fibre grating temperature sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In FIG. 1 , the multi-substrate high-sensitivity FBG temperature sensor of this embodiment is composed of end cap 1 , optical fiber 2 , FBG 3 , upper base 4 , middle base 5 , lower base 6 , and sleeve 7 .

[0016] A lower base 6 is installed in the casing 7. The lower base 6 in this embodiment is a beryllium bronze plate. The geometric shape of the lower base 6 is a cuboid with a length of 120 mm, a width of 5 mm, and a thickness of 1.2 mm. The upper surface of the lower base 6 is welded and fixedly connected to the middle base 5, the middle base 5 is an aluminum plate, and the geometric shape of the middle base 5 is a cuboid, with a length of 120 mm, a width of 5 mm, and a thickness of 1.2 mm. The upper surface of middle base 5 is bonded with upper base 4 with 353ND glue, and can also be bonded with 383 glue. Upper base 4 is an ultra-high temperature polyimide (pi) plate, which is a commodity sold on the market, and is produced by Changzhou Yong, Jiangsu. Produced by B...

Embodiment 2

[0018] In Embodiment 1, the lower base 6 is a beryllium bronze plate, the middle base 5 is an aluminum plate, and the upper base 4 is an ultra-high temperature polyimide (pi) plate, and the geometric shapes of the lower base 6, the middle base 5, and the upper base 4 are as follows: Mutual coupling relation is identical with embodiment 1. The fiber grating 3 bonded on the upper substrate 4 is doped with germanium and its center wavelength is 1548.24nm at 0°C. Other components and the coupling relationship of the components are the same as in Embodiment 1.

Embodiment 3

[0020] In Embodiment 1, the lower base 6 is a beryllium bronze plate, the middle base 5 is an aluminum plate, and the upper base 4 is an ultra-high temperature polyimide (pi) plate, and the geometric shapes of the lower base 6, the middle base 5, and the upper base 4 are as follows: Mutual coupling relation is identical with embodiment 1. The fiber grating 3 bonded on the upper substrate 4 is doped with germanium and the center wavelength is 1562.72nm at 0°C. Other components and the coupling relationship of the components are the same as in Embodiment 1.

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Abstract

The invention relates to a multi-base high-sensitivity optical fiber grating temperature sensor. A lower base is disposed in a sleeve, a middle base is disposed on the upper surface of the lower base, an upper base is disposed on the upper surface of the middle base, an optical fiber grating is disposed on the upper surface of the upper base, an end cover is disposed at the end portion of the sleeve, and an optical fiber with end portion passing through the end cover and extruding out of the sleeve is connected with the optical fiber grating. The experiments in laboratory and on production field show that: compared with the bare fiber, in the inventive optical fiber grating temperature sensor, the temperature measurement range is -20-100 DEG C, the degree of linearity is 0.999, the temperature response sensitivity is 0.11 nm / DEG C, the temperature response time is less than 1s, and the temperature response sensitivity is 11 times of that of the bare fiber, which can meet the requirements of oil and gas pipelines, including high electromagnetic interference resistance ability, high temperature sensitivity and rapid response time. The invention has the advantages of small volume, simple structure, wide detection range and high sensitivity; and can be installed on the pipelines to realize multi-sensor multi-site real-time permanent measurement, and can be widely used in oil and gas pipelines.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to an optical fiber grating temperature sensor packaged with multiple base materials for high-sensitivity detection of temperature. Background technique [0002] Fiber Bragg grating sensor is the central wavelength shift of the fiber grating reflection spectrum or transmission spectrum caused by the measured physical quantity. The measurement of the physical quantity can be realized by detecting the wavelength shift. It is a wavelength modulation sensor and can be used as an intelligent structure sensor. Fiber Bragg grating sensors have many advantages such as strong anti-electromagnetic interference, high sensitivity, small size, light weight, corrosion resistance, wide measurement range, easy integration, simple structure, easy reuse into a network, and easy use in intelligent structures. Inside the measured object and material, it realizes multi-point distribution, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01D5/353G01K11/3206
Inventor 乔学光傅海威禺大宽王宏亮周红
Owner XI'AN PETROLEUM UNIVERSITY
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