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A photonic crystal fiber methane sensing device based on intermodal interference

A photonic crystal fiber, inter-mode interference technology, applied in cladding fiber, optical waveguide light guide, phase influence characteristic measurement, etc., can solve the problems of poor selectivity, low sensitivity, etc. Effect

Active Publication Date: 2017-02-08
重庆科知源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this gas sensor is only based on changes in the density of volatile organic compounds, which has poor selectivity and low sensitivity

Method used

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  • A photonic crystal fiber methane sensing device based on intermodal interference
  • A photonic crystal fiber methane sensing device based on intermodal interference
  • A photonic crystal fiber methane sensing device based on intermodal interference

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0056] Experimental Example 1: The inner wall of the cladding air hole is coated with a cage molecule E-(OC 2 h 5 ) 6 A polycarbonate resin methane-sensitive film with a photonic crystal fiber length of 3 cm. Taking the methane standard gas with a methane concentration of 0-3.5% (v / v) as the object, it interacts with the sensitive film on the inner surface of the cladding air hole respectively, and the characteristic wavelength of the reflection interference spectrum moves to the long wavelength direction with the increase of the methane gas concentration , and the average moving amount of the characteristic wavelength There is a linear correlation with methane concentration c, and its linear regression equation is:

[0057] Δλ ¯ = kc + b

[0058] In the formula, c is the concentration of methane gas to be measured, is the average moving amount of the characteristic wavelength of the photonic crystal fiber ref...

experiment example 2

[0061] Experimental example 2: The inner wall of the cladding air hole is coated with a cage molecule E-(OC 2 h 5 ) 6 A polycarbonate resin methane-sensitive film with a photonic crystal fiber length of 5 cm. The gas standard gas with known methane concentration of 0, 0.1, 0.4, 1.0, 1.8, 2.8, 3.5% (v / v) is used for detection, and the characteristic wavelength of the corresponding reflection interference spectrum moves to the long wavelength direction with the increase of methane gas concentration. The average shift of the characteristic wavelength of its interference spectrum 0, 0.34, 0.48, 1.58, 2.18, 2.80, 3.08nm respectively, the linear regression equation is: Correlation coefficient R 2 =0.9505, that is, k and b in the linear regression equation are 0.8827 and 0.2837 respectively.

[0062] When the methane gas to be measured is in contact with the sensitive film on the inner surface of the photonic crystal fiber cladding air hole, the average shift of the characteri...

experiment example 3

[0063] Experimental Example 3: The inner wall of the cladding air hole is coated with a cage molecule E-(OC 2 h 5 ) 6 A polycarbonate resin methane-sensitive film with a photonic crystal fiber length of 7 cm. The gas standard gas with known methane concentration of 0, 0.1, 0.4, 1.0, 1.8, 2.8, 3.5% (v / v) is used for detection. The average shift of the characteristic wavelength of the interference spectrum 0, 0.36, 0.48, 1.68, 2.24, 2.92, 3.16nm respectively, the linear regression equation is: Correlation coefficient R 2 =0.9448, that is, k and b in the linear regression equation are 0.9096 and 0.3011 respectively.

[0064] When the methane gas to be measured is in contact with the sensitive film on the inner surface of the photonic crystal fiber cladding air hole, the average shift of the characteristic wavelength of the interference spectrum is 1.76nm, it can be calculated that the concentration of methane gas to be measured is c=1.6%, the response time is 46 seconds,...

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Abstract

The invention discloses a photonic crystal optical fiber methane sensing device based on modular interference. The device is composed of a broadband light source, an optical circulator, a photonic crystal optical fiber methane sensor cladding an air hole coated polymer sensitive film, a testing air chamber, a switching valve, a quality flow controller, a spectrum analyzer and a computer, wherein the optical fiber methane sensor consists of a single mode fiber, a photonic crystal optical fiber and a welding area of the two fibers; the adopted photonic crystal optical fiber refers to an endless single mode solid core photonic crystal optical fiber; the polymer sensitive film refers to a polycarbonate resin methane sensitive film containing a cage molecule E-(OC2H5)6, and the inner wall of the cladding air hole of the photonic crystal optical fiber is coated with the film by virtue of an air pressure driving device; when the to-be-tested methane gas acts with the sensitive film on the inner wall of the cladding air hole of the photonic crystal optical fiber, the refractive index of the sensitive film changes, the reflection interference spectrum characteristic wavelength of the sensor is moved, the average movement amount shown in the description of the reflection interference spectrum characteristic wavelength before and after contacting the sensor with the methane gas is analyzed, so that the concentration of the to-be-tested methane gas can be obtained. The device disclosed by the invention has the characteristics of high sensitivity, high stability, high selectivity and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a photonic crystal optical fiber methane sensing device based on intermodal interference for obtaining methane concentration. Background technique [0002] The fiber optic gas sensor has the characteristics of good electrical insulation, strong electromagnetic interference resistance, intrinsic safety, small size, and corrosion resistance. It is especially suitable for use in harsh environments such as flammable, explosive, and high temperature. Ambient air quality monitoring and explosive gas detection, etc. [0003] Photonic Crystal Fiber (PCF, Photonic Crystal Fiber) is an artificially constructed photophysical functional material whose refractive index changes periodically. Its cross section contains pores in different arrangements. The scale of these pores is roughly the same as the wavelength of light Level and throughout the entire length of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45G02B6/02
Inventor 杨建春车鑫周浪陈伟民
Owner 重庆科知源科技有限公司
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