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Optical fiber methane sensor based on graphene sensitivity enhancing and preparation method thereof

A methane sensor and graphene technology, applied in the field of sensors, can solve the problems of weak anti-electromagnetic interference, poor methane sensing, poor electrical insulation, etc., so as to improve the methane sensing and sensitivity, increase the conductivity, and increase the refractive index. Effect

Active Publication Date: 2017-05-31
DEZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the methods for detecting methane gas mainly include catalytic combustion type, semiconductor type, electrochemical type, optical type, etc. However, these methods have disadvantages such as poor explosion-proof performance, weak anti-electromagnetic interference ability, poor electrical insulation, and short detection distance.
Although the optical fiber methane sensor can overcome the above shortcomings, the existing optical fiber methane sensor has poor methane sensitivity and low sensitivity

Method used

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  • Optical fiber methane sensor based on graphene sensitivity enhancing and preparation method thereof
  • Optical fiber methane sensor based on graphene sensitivity enhancing and preparation method thereof
  • Optical fiber methane sensor based on graphene sensitivity enhancing and preparation method thereof

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preparation example Construction

[0042] This embodiment also provides a method for preparing a side-polished optical fiber, in which a section of a single-mode optical fiber is

[0043] The 15mm area is polished to a place close to the fiber core. The grinding depth is monitored by a filament measuring instrument. The single-mode fiber is immersed in a test tube filled with alcohol and cleaned by an ultrasonic cleaner to ensure that the surface of the area before coating the film is clean. .

[0044] Preferably, the tin salt is tin tetrachloride.

[0045] Preferably, the alcohol is isopropanol.

[0046] This embodiment also provides an application of the graphene-based optical fiber methane sensor in methane.

[0047] This embodiment also provides an application of the graphene-based optical fiber methane sensor in mine gas leakage monitoring.

[0048] Its sensing principle is:

[0049] Tin dioxide is an n-type semiconductor, which is conducted by electrons. Light waves propagate in it, and there is absor...

Embodiment

[0063] 1. Preparation of side-polished optical fiber

[0064] A single-mode optical fiber with a core diameter of 9 μm and a cladding diameter of 12 μm was used to polish a 15 mm section of the optical fiber by the wheel polishing method until it was close to the core. The grinding depth was monitored by a filament measuring instrument. Dip the optical fiber into a test tube filled with alcohol, and clean it with an ultrasonic cleaner to ensure that the surface of the area before coating the film is clean. The prepared side-polished optical fiber is as follows: figure 1 shown.

[0065] 2. Preparation of fiber optic methane sensor based on graphene sensitization

[0066] Weigh SnCl 4 ·5H 2 O, dissolved in 50mL of isopropanol to make a solution with a concentration of 0.05mol / L, one part of which was added with 0.05g of graphene. Place the prepared solution on a magnetic stirrer at room temperature and stir for 4 hours, then remove it and let it stand Aging for 24h. Apply t...

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Abstract

The invention discloses an optical fiber methane sensor based on graphene sensitivity enhancing and a preparation method thereof. The optical fiber methane sensor based on graphene sensitivity enhancing comprises a side polishing optical fiber, wherein the surface of the side polishing optical fiber exposing a fiber core is coated with a graphene doped tin oxide film. The preparation method comprises the following steps: adding graphene into a tin salt alcohol solution, mixing, and aging to obtain a graphene doped tin oxide film solution; and coating the tin oxide film solution on the surface of the side polishing optical fiber exposing the fiber core. The sensor provided by the invention has favorable methane sensing property and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a graphene-based optical fiber methane sensor and a preparation method. Background technique [0002] Methane is widely distributed in nature. Methane is the simplest organic substance and the main component of natural gas, biogas, pit gas, etc., commonly known as gas. It is also the hydrocarbon with the smallest carbon content (the largest hydrogen content), and is also the main component of natural gas, biogas, oilfield gas and coal mine tunnel gas. It can be used as a fuel and a raw material for the production of hydrogen, carbon black, carbon monoxide, acetylene, hydrocyanic acid and formaldehyde. [0003] Methane is a greenhouse gas. GWP's analysis shows that methane's greenhouse effect is 25 times greater than that of carbon dioxide in terms of the number of molecules. This is because there is already so much carbon dioxide in the atmosphere that many bands o...

Claims

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Application Information

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IPC IPC(8): G01N21/21
CPCG01N21/21
Inventor 张俊叶许士才王吉华周耀旗李振华王晓欣董文会
Owner DEZHOU UNIV
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