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Fiber bragg grating pressure sensor packaged by carbon fiber tube

A pressure sensor and fiber grating technology, which is applied to the measurement of fluid pressure using optical methods, the measurement of fluid pressure, and the measurement of force by measuring the change of optical properties of materials when they are stressed. Stable work, etc.

Active Publication Date: 2021-05-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pressure sensors based on Fabry-Perot interferometers and photonic crystal fibers require complex processing methods and structures, and it is difficult to achieve high sensitivity in the high pressure range
Pressure sensors based on fiber grating packaging are packaged by elastomers such as polymers or by designing some structures, but this method is difficult to take into account the relationship between sensing range and sensitivity, either low-range high-sensitivity, or high-range low Sensitivity, and it is difficult to work stably in high temperature and high pressure environment

Method used

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  • Fiber bragg grating pressure sensor packaged by carbon fiber tube
  • Fiber bragg grating pressure sensor packaged by carbon fiber tube
  • Fiber bragg grating pressure sensor packaged by carbon fiber tube

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] The invention discloses a fiber grating pressure sensor packaged in a carbon fiber tube, which includes a carbon fiber tube, a package body, and an optical fiber. The schematic diagram of its structure is as follows figure 1 shown. The fiber grating sensor includes a temperature compensation grating 1, a cylindrical package 2, a hollow steel pipe 3, a U-shaped package 4, a T-shaped package 5, a thread 6, a carbon fiber tube 7, a pressure-sensitive grating 8, a carbon fiber sheet 9 and an optical fiber 10. In this embodiment, the temperature compensation grating 1 is packaged in the hollow steel pipe 3 through the cylindrical package 2, and the U-shaped package 4, the T-shaped package 5 and the carbon fiber tube 7 are packaged with high-temperature-resistant epoxy resin glue , forming the base elastomer.

[0025] Preferably, the carbon fiber tube 7 in this embodiment is braided using a three-dimensional and four-directional braiding process, and the material is carbon f...

Embodiment 2

[0032] This embodiment provides a temperature response testing method of a fiber grating pressure sensor packaged in a carbon fiber tube, comprising the following steps:

[0033] (1) Connect one end of the packaged pressure sensor to a fiber optic coupler, and connect the other two ends of the fiber optic coupler to a broadband light source (Superk Compact, NKT Photonics, Denmark) and a spectrum analyzer (AQ6370B, Yokogawa, Japan). The broadband light source outputs supercontinuum light, and the spectrum analyzer is used to monitor the reflection spectrum, and its wavelength resolution is set to 20pm, and the wavelength scanning range is 1500-1600nm.

[0034] (2) Place the packaged pressure sensor in a constant temperature oil tank (HTS-30B) for heating. The temperature resolution of the constant temperature oil tank is ±0.01°C. The temperature characteristics were demonstrated at 20°C intervals between room temperature and 150°C, and the temperature of the oil tank was kept c...

Embodiment 3

[0042] A pressure response test of a fiber grating pressure sensor packaged in a carbon fiber tube at high temperature, comprising the following steps:

[0043] (1)(2) Same as pressure response test at room temperature.

[0044] (3) Put the high-pressure tank in the constant temperature oil tank (HTS-30B), at the temperature of 50°C, 100°C, and 150°C respectively, the pressure increases from 0MPa to 80MPa at unequal intervals, and the pressure fluctuation during data recording is <± 0.05MPa.

[0045] Figure 4 It is the pressure response curve of the pressure-sensitive grating of the fiber grating pressure sensor packaged in a carbon fiber tube of the present invention at different temperatures. The pressure response characteristics of the pressure sensor at 50°C, 100°C, and 150°C were studied. The sensitivities at ℃, 100℃, and 150℃ are -29.55pm / MPa, -30.91pm / MPa, and -50.02pm / MPa, respectively, and the pressure response and pressure-sensitive grating wavelength change show ...

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Abstract

The invention discloses a fiber bragg grating pressure sensor packaged by a carbon fiber tube, and belongs to the field of optical fiber sensing. The sensor comprises the carbon fiber tube, packaging bodies and an optical fiber; the optical fiber is provided with a temperature compensation grating and a pressure sensitive grating; the temperature compensation grating is packaged in a hollow steel pipe through the cylindrical packaging body; the pressure sensitive grating is connected with the carbon fiber tube through high-temperature-resistant epoxy resin glue; the two ends of the carbon fiber tube are connected with a T-shaped packaging body through the high-temperature-resistant epoxy resin glue; and the T-shaped packaging body is connected with the U-shaped packaging body through the high-temperature-resistant epoxy resin glue. The pressure sensor packaged by the carbon fiber tube is simple in preparation process and low in preparation cost, can realize distributed sensing, and has a wide application prospect in practice. When a pressure test is carried out on the pressure sensor, the pressure sensor can achieve relatively high pressure sensitivity in a pressure range of 0-80MPa or even higher, and can work in a high-temperature environment; and the pressure sensor is provided with the temperature compensation grating, so that the pressure sensor can stably work in a high-temperature and high-pressure severe environment.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber grating pressure sensor packaged in a carbon fiber tube. Background technique [0002] In the process of oil and gas exploitation, pressure is one of its important parameters, and it is extremely important to determine the distribution of oil layers to ensure the safety of the exploitation process. However, the harsh downhole environment of oil and gas, high temperature, high pressure and some corrosive gases make it difficult for traditional electronic sensors to measure stably for a long time, which poses a huge challenge to the design and packaging of sensors. Due to its small size, light weight, high temperature resistance, corrosion resistance, strong resistance to electromagnetic interference, and distributed sensing, fiber optic sensors have attracted widespread attention and are used in harsh environments such as aerospace and oi...

Claims

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Application Information

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IPC IPC(8): G01L1/24G01L11/02
CPCG01L1/246G01L11/025
Inventor 于永森薛兆康国旗孙洪波
Owner JILIN UNIV
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