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High-sensitivity optical fiber grating liquid level/fluid pressure sensor

A fiber grating and high-sensitivity technology, which is used in the measurement of fluid pressure, fluid pressure measurement using optical methods, liquid/fluid solid measurement, etc., can solve the problems of difficult liquid level monitoring and limited sensitivity, and achieve easy networking, The effect of high precision and simple structure

Active Publication Date: 2013-01-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2008, Wang Hongliang, Qiao Xueguang and others proposed a stress hysteresis and temperature automatic compensation FBG pressure sensing method by observing the dual grating Bragg wavelength difference, but its sensitivity is limited and it is difficult to be used for liquid level monitoring

Method used

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  • High-sensitivity optical fiber grating liquid level/fluid pressure sensor
  • High-sensitivity optical fiber grating liquid level/fluid pressure sensor
  • High-sensitivity optical fiber grating liquid level/fluid pressure sensor

Examples

Experimental program
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Embodiment Construction

[0029] In the figure: 1. Spring tube, 2. Pressure inlet, 3. Head, 4. Sensing grating and its optical fiber, 5. Free end of spring tube, 6. Expansion frame integrated with pressure inlet 2, 7. Glass cover for encapsulating the shell, 8. Cylindrical appliance for encapsulating the shell, 9. Pressure gauge, 10. Water pipe, 11. Valve, 12. Coupler, 13. Optical fiber where the compensation grating is located, BBS, broadband light source, OSA, spectrometer.

[0030] image 3 6-1~6-4 in the figure are screw holes with a diameter of 2mm.

[0031] Figure 4 8-1 in the figure is a hole slightly larger than the outer diameter of the pressure inlet. When the sensor head is put into the package shell, the pressure inlet needs to pass through this hole. 8-2~8-11 are screw holes with a diameter of 2mm. ; 8-12 is a hole with a diameter of 9mm, which is used to place a small D-type adapter.

[0032] Such as Figure 1 to Figure 6 shown. High-sensitivity fiber grating liquid level / fluid pres...

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Abstract

The invention discloses a high-sensitivity optical fiber grating liquid level / fluid pressure sensor. By utilizing the characteristics that the exterior of a C-shaped spring tube tends to be strengthened along with the increase of fluid pressure in the tube and the process is reversible, optical fibers of a grating are fixed at both ends of the spring tube and the working wavelength of the gratingis influenced by the deformation of the spring tube, thus the liquid pressure is further monitored. The proportional relation between liquid pressure and liquid level is considered so that the high-sensitivity optical fiber grating liquid level / fluid pressure sensor can also be used for monitoring the liquid level. The wavelength drift distance and the amount to be measured of a sensor device arein a linear relation and convenient to calibrate. The invention is suitable for monitoring the liquid level or the fluid pressure / pressure intensity in flammable and explosive occasions, such as an oil depot and other occasions with hidden danger and is convenient to carry out network distributed monitoring.

Description

technical field [0001] The invention relates to the fields of optical fiber optoelectronics, optical fiber sensing and optical fiber grating sensing, which can be used to monitor liquid level, fluid pressure or pressure. Background technique [0002] In recent years, wavelength-coded Fiber Bragg grating (FBG) sensors have been successfully used in the sensing of physical quantities such as pressure, displacement, temperature, current, magnetic field, and acceleration, and have received widespread attention. Liquid level is one of the common physical quantities in daily life. Considering the liquid surface tension, the adhesion between the liquid and the container wall, and the possible air bubbles in the liquid, etc., the conventional liquid level measurement method (such as: mechanical float type liquid Level gauge, electronic liquid level sensor, thermal liquid level gauge, radar liquid level sensor, ultrasonic liquid level sensor, isotope / radioactive liquid level sensor, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/292G01L11/02G01L19/04
Inventor 余有龙庄宏顺
Owner HEFEI UNIV OF TECH
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