Gas on-line monitoring device and method for fiber grating gas sensing

A fiber grating and sensing technology, applied in the field of industrial sensing, can solve the problems affecting the accuracy and stability of fiber grating test results, the influence of artificial neural network pattern recognition, and the large difference between monitoring results and real values. Small size, reduced disturbance, and the effect of reducing collision friction

Active Publication Date: 2019-11-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the inventor's follow-up research found that: at present, this type of fiber grating sensor is a high-sensitivity, high-precision sensor based on the elasto-optic effect, which is sensitive to mechanical disturbances such as vibration and impact. When the gas to be monitored enters, the airflow disturbance generated will cause the fiber grating to vibrate violently, and at the same time collide with the test tube wall, resulting in more noise signals in the final result, resulting in the result being unable to truly and intuitively display the central wavelength. The offset will affect the accuracy and stability of the fiber grating test results, and will have a greater impact on the pattern recognition of the next artificial neural network, making the monitoring results far from the real value

Method used

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  • Gas on-line monitoring device and method for fiber grating gas sensing
  • Gas on-line monitoring device and method for fiber grating gas sensing
  • Gas on-line monitoring device and method for fiber grating gas sensing

Examples

Experimental program
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Effect test

Embodiment 1

[0061] 1. Fiber Bragg grating sensing element coated with gas-sensitive polymer film 1

[0062] Use a dropper to take a small amount of polyamic acid solution and drop it into the polytetrafluoroethylene mold. Using a fiber grating with a diameter of 125 μm, hold both sides of the grid area with both hands, and slowly immerse the grid section in the polyamic acid solution. When the grid area is completely When immersed in the solution, rotate the optical fiber slowly so that the surface of the grid area is completely and evenly attached to the polyamic acid solution. After 180s, slowly pull the grid area out of the solution and put it into the oven. Set the temperature of the oven to 90°C. After imidization and drying for 300s, repeat the steps of soaking-spinning-pulling-drying three times to prevent the formation of a complete film structure on the surface of the gate region due to the influence of surface tension.

[0063] 2. The basic structure of the test tube 4 and the v...

Embodiment 2

[0075] The gas on-line monitoring device for fiber grating gas sensing is basically the same as that in Embodiment 1, the difference is that the test tube 4 with the ventilation branch pipe 5 and 7 is refitted as the test tube 4 with the ventilation hole, and the specific operation is as follows: cancel the ventilation branch pipe 5, 7, and set dense air holes 8 at the bottom of the tubes on both sides of the test tube 4 at a distance of 50 mm from both ends, such as Image 6shown. At this time, because the vent hole 8 is provided at the bottom, even in a rainy environment, it can still keep the device from being soaked by rainwater; since the vent hole is between the optical fiber supporting stabilizer 2 and the sealing plug 6, the optical fiber supporting stabilizer 2. It can reduce the disturbance of the convective wind to the optical fiber and prevent the convective wind from acting on the radial direction of the optical fiber; at the same time, the dense ventilation holes...

Embodiment 3

[0078] A gas on-line monitoring device for fiber grating gas sensing, comprising: a fiber grating sensing element 1, a test tube 4, a fiber grating support stabilizer 2, a positioning tube 3, a sealing plug 6, a fiber grating demodulator, Computer processor; the two ends of the test tube 4 are sealed by sealing plugs 6, the test tube 4 is provided with a fiber grating supporting stabilizer 2, and the fiber grating supporting stabilizer 2 is provided with a fiber grating sensing element 1 And the through holes 2-1, 2-2 through which the positioning tube 3 passes, the positioning tube 3 passes through the fiber grating supporting stabilizer 2, and is fixedly connected with the sealing plug 6 at at least one end;

[0079] The fiber grating sensing element 1 has an axial strain response characteristic, and is connected with a fiber grating demodulator and a computer processor in sequence.

[0080] Its using method is the same as embodiment 1.

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Abstract

The invention relates to a gas on-line monitoring device and a gas on-line monitoring device and method used for fiber grating gas-sensitive sensing. The gas on-line monitoring device comprises a fiber grating sensing element, a test tube, a fiber grating supporting stabilizer, a positioning tube, a sealing plug, a fiber grating demodulator and a computer processor. The fiber grating sensing element passes through the fiber grating supporting stabilizer, and is arranged in the test tube, and the fiber grating sensing element is sequentially connected with the fiber grating demodulator and thecomputer processor. The device has advantages of small volume, low cost, transparent appearance and good visibility, and can be used to effectively reduce the flutter of the fiber grating in the usingprocess on the premise of not influencing the axial strain of the fiber grating, obviously reduce the system error and increase the accuracy and the stability of the detection result.

Description

technical field [0001] The invention belongs to the field of industrial sensing, and in particular relates to an online gas monitoring device and method for fiber grating gas sensing. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Today's technological development is changing with each passing day, and industrial productivity is advancing by leaps and bounds. With the development of the economy, environmental protection issues have gradually attracted people's attention. In order to better control pollution and protect the environment, more and more sensing devices have appeared on the market. Taking gas detection as an example, most of the gas sensors currently on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/53G01N21/47
CPCG01N21/474G01N21/53G01N2021/4742
Inventor 周振泽贾玉玺张雷达徐永正刘安娜智杰颖
Owner SHANDONG UNIV
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