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Fiber grating gas sensor array

A technology of gas sensor and optical fiber grating, which is applied in the field of gas sensor and gas detection, can solve the problems of sensor volume increase and cost increase, and achieve the effects of high detection sensitivity, mild conditions and strong anti-interference ability

Active Publication Date: 2019-02-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas sensors currently on the market can only measure a single type of gas. For multi-component gases, a combination of multiple gas sensors is required to detect them. Compared with a single gas sensor that can simultaneously detect multi-component gases, the cost increases and the volume of the sensor relatively larger

Method used

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  • Fiber grating gas sensor array
  • Fiber grating gas sensor array
  • Fiber grating gas sensor array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this example, the gas-sensing expansion characteristics of fiber Bragg grating with a diameter of 80 μm / polyurethane polymer film with a thickness of 30 μm and that with a diameter of 125 μm / polyurethane polymer film with a thickness of 30 μm to acetone gas are studied respectively. , the length is 0.003m. The modulus of the polyurethane polymer film is controlled on demand by adjusting the ratio of the soft segment to the hard segment in the polyurethane macromolecule and the amount of nano fillers. image 3 It is the relationship curve between the elastic modulus and the theoretical elongation of the polyurethane polymer film when the optical fiber grating produces 0.001% axial tensile strain. It can be seen that the fiber gratings with diameters of 80 μm and 125 μm produce the same axial strain. When the modulus of the polymer film is the same, the polyurethane polymer film coated with the outer layer of the fiber grating with a diameter of 125 μm needs greater de...

Embodiment 2

[0057] Fiber Bragg gratings with a diameter of 80 μm produce axial strains of 0.01%, 0.005%, and 0.001% respectively under the stretching action of polyurethane polymer films in different concentrations of acetone gas environments. The length-rate relationship curve compared to Figure 4 .

[0058] Depend on Figure 4 It can be seen that the greater the axial strain generated by the fiber Bragg grating with a diameter of 80 μm, the greater the theoretical elongation required for the polyurethane polymer film, that is, the larger deformation of the polymer film is required to drive the greater strain of the fiber Bragg grating . And the difference in theoretical elongation gradually decreases with the increase of the modulus of the polymer film, that is, when the optical fiber grating produces different strains, the smaller the modulus of the polymer film coated on the outer layer, the lower the difference in theoretical elongation. The larger the value.

Embodiment 3

[0060] Fiber Bragg gratings with a diameter of 125 μm produce axial strains of 0.01%, 0.005%, and 0.001% respectively under the stretching action of polyurethane polymer films in different concentrations of acetone gas environments. The length-rate relationship curve compared to Figure 5 .

[0061] Depend on Figure 5 It can be seen that the change law of the fiber grating with a diameter of 125 μm is similar to that of the fiber grating with a diameter of 80 μm when different strains are produced. The difference from the 80μm fiber grating is that when the modulus of the polymer film is 5GPa, the strain of the polymer film is 0.008% when the optical fiber with a diameter of 125 μm is strained by 0.001%; ​​when the strain of 0.01% is generated, the strain of the polymer film is is 0.076%, that is, the strain of the polymer film is increased by 0.068%; when the 80μm optical fiber produces a strain of 0.001%, the polymer film strain is 0.004%; The strain of the molecular fil...

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Abstract

The invention provides a fiber grating gas sensor array capable of simultaneously detecting gas composition and concentration, comprising three array fiber gratings: a temperature fiber grating, a temperature-compensated gas-sensitive fiber grating, and a gas-sensitive fiber grating. The temperature fiber grating is a naked optical fiber grating, which is in a sleeve package; the temperature-compensated gas-sensitive fiber grating is a fiber grating coated with a gas-sensitive expansion polymer film in a sleeve package; the gas-sensitive fiber grating is a fiber grating coated with the gas-sensitive expansive polymer film, which is exposed to the detection environment. The invention can realize the multi-point detection of the concentration of a single gas, the simultaneous detection of the multi-type gases and their concentration thereof, greatly improving the cost performance and integration of the gas sensor. The invention prevents problems related with high cost, too bulky volume and difficulty in networking associated with the traditional gas sensor detection either involved in a single gas detection, or in establishing multi-point detection for multi-type detections.

Description

technical field [0001] The invention belongs to the field of gas sensors and gas detection, in particular to an optical fiber grating gas sensor array capable of simultaneously detecting gas components and concentrations. Background technique [0002] A gas sensor is a device that converts information such as gas composition and concentration into information that can be used by personnel, instruments, computers, etc. As humans pay more and more attention to issues such as the environment and public safety, gas sensors have been widely used in three major fields of industry, civil and environmental monitoring. [0003] The different response curves of the gas sensor to different gases are the basic basis for the sensor to detect the target gas composition and concentration. The output signal of the gas sensor is affected by two key parameters of the gas composition and concentration: the gas sensor has different curve responses to different gas compositions The rate of chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01K11/32G01K11/3206
CPCG01K11/32G01N21/1717G01N2021/1725
Inventor 贾玉玺刘安娜刘惠徐永正刘大河
Owner SHANDONG UNIV
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