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Fiber grating liquid flow sensor with temperature compensation

A technology of flow sensor and fiber grating, which is applied in the field of fiber grating sensor, can solve the problem that the integrated flow cannot be measured, and achieve a good protective effect

Inactive Publication Date: 2011-06-15
TIANJIN METALWORKING MACHINERY & EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, the design concept and manufacturing process of flow sensors were aimed at uniform fluids. For the complex characteristics, the flow rate of stratified liquid phase or partly stratified and mixed liquid phase could not measure the comprehensive flow rate.

Method used

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  • Fiber grating liquid flow sensor with temperature compensation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] As shown in the figure: take a coated common fiber grating with a reflection wavelength of 1545.376nm as liquid-facing fiber grating 1, and another coated common fiber grating with a reflection wavelength of 1544.938nm as back-fluid fiber grating 2. 1 and 2 are respectively glued to the two surfaces of the elastic tongue 3 with special glue 4. After the glue is completely cured, position the elastic tongue together with the two fiber gratings in the shell 5 according to the direction of the liquid flow. The fiber grating should face the liquid flow direction, and the liquid-backed fiber grating should face away from the liquid flow direction. Finally, the two conductive optical fibers 6 and 7 passing through the casing 5 should be sealed with the casing 5 with special glue, and then the casing 5 and the pipe 8 should be sealed together. Just pack it together.

Embodiment 2

[0022] Example 2: See the figure: a high-temperature-resistant fiber grating coated with a high-temperature-resistant coating is used as liquid-resisting fiber-optic grating 1, and its reflection wavelength is selected as 1550.237nm, and another high-temperature-resistant fiber grating coated with a high-temperature resistant coating is The fiber grating is used as the back liquid fiber grating 2, and its reflection wavelength is selected as 1549.533nm. The fiber grating 1 and 2 are respectively glued to the two surfaces of the elastic tongue 3 with special glue 4. After the glue is completely cured, the elastic tongue together with the two A fiber grating is positioned in the housing 5 according to the liquid flow direction, and finally the two conductive optical fibers 6 and 7 passing through the housing 5 are sealed together with the housing 5 with special glue, and then the housing 5 and the pipe 8 are assembled together. Can. (Note that this example is suitable for a high...

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Abstract

The invention relates to a fiber grating sensor, in particular to a fiber grating liquid flow sensor with temperature compensation or for eliminating the influence of temperature change on a measurement value. The sensor has high data acquisition precision and long service life, can work under the environment of high temperature (over 300 DEG C) and high pressure (over 40MPa) and acquire effective data, and is not affected by the adverse conditions of electric field, magnetic field, explosiveness, flammability and the like; the service life of the sensor is nearly semi-permanent; and the sensor has small volume, is easy to install, has high measurement precision, and can adapt to flow measurement of complex, layered and mixed layers. Particularly in the petroleum extraction process, the requirement of measurement of liquid yield is more prominent; and particularly, the sensor can be applied in the places where the temperature sensors of other forms are not competent, and particularly has great application prospect in the fields of nuclear power plants, oil fields, spaceflight, chemical industry, mining industry, energy conservation, emission reduction and the like.

Description

technical field [0001] The invention relates to an optical fiber grating sensor, in particular to an optical fiber grating liquid flow sensor with temperature compensation or eliminating the influence of temperature changes on measured values. Background technique [0002] Fiber Bragg grating sensor technology is a kind of high-tech new technology with the highest accuracy and the longest life in the current cutting-edge data acquisition methods. In particular, it can collect Effective data is not affected by unfavorable conditions such as electric fields, magnetic fields, explosives, and flammables, and its service life is almost semi-permanent. [0003] In the past, the design concept and manufacturing process of flow sensors were aimed at uniform fluids. For complex characteristics, it was impossible to measure the comprehensive flow rate of stratified liquid phase flow or partly stratified and mixed liquid phase. [0004] With the continuous adoption of fiber grating se...

Claims

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Application Information

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IPC IPC(8): E21B47/00G01F1/28
Inventor 张强
Owner TIANJIN METALWORKING MACHINERY & EQUIP MFG
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