CN106198409B - A kind of gas concentration many reference amounts detection device - Google Patents
A kind of gas concentration many reference amounts detection device Download PDFInfo
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- CN106198409B CN106198409B CN201610593814.XA CN201610593814A CN106198409B CN 106198409 B CN106198409 B CN 106198409B CN 201610593814 A CN201610593814 A CN 201610593814A CN 106198409 B CN106198409 B CN 106198409B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a kind of gas concentration many reference amounts detection devices, including wideband light source, methane transducer, ethane sensor, propane sensor, humidity sensor, temperature sensor, photoswitch, test gas chamber, computer and mass flow controller etc.；The front end of sensor connects wideband light source by photoswitch I；The rear end of sensor connects spectroanalysis instrument by photoswitch II；Sensor is located in test gas chamber.It (is respectively cage molecule A, cage molecule E (OC that the sensitive membrane for wherein tilting long-period fiber grating methane, ethane and propane sensor, which is containing cage molecule,3H7)6Or cage molecule M (OC3H7)6) and graphene low-refraction ultraviolet light cure fluorosilicone sensitive membrane, when methane to be measured, ethane and propane are with corresponding sensitive membrane interaction, it can cause sensitive membrane refraction index changing, so that the transmission spectrum of methane, ethane and propane sensor drifts about, the concentration of methane, ethane and propane can be measured by the drift value of spectroanalysis instrument transmission spectrum.
Description
Technical field
The present invention relates to a kind of gas concentration detection device more particularly to a kind of gas concentration many reference amounts detection devices.
Background technology
Oil is lifelines of the national economy, oil reserve be stablize supply-demand relationship, stabilize oil price, solution of emergent event it is most straight
It connects, most effective means, various countries are laid in oil as strategic materials, form the oil reserve being made of large-scale storage tank
Library.Oil product volatility and diffusivity are stronger, have the characteristics that inflammable and explosive, accumulation of static electricity, thermal expansivity, therefore prison in real time
Ethereal oil gas concentration in oil gas storage tank is surveyed to be of great significance for oil gas storage tank safe operation.
Large-scale petroleum storing tank mostly uses outer floating roof structure, and the head cover on oil tank is swum on pasta, with being floated downward on pasta
It is dynamic.Wherein, the core of oil tank active defense is to control storage oil product and imflammable gas in the evaporating space of floating roof lid in oil tank
The ratio of (the predominantly mixed gas containing methane, ethane, propane) concentration, away from explosion limit.Currently, detection combustible gas
The method of body includes photoion gas sensor, catalytic combustion method gas sensor, resistance sensor, fibre optical sensor etc.,
Wherein optical fiber sensing technology has very high measurement sensitivity and quick responding ability, to temperature, humidity, strong electromagnetic
Resistance is stronger, has potential using value in oil gas monitoring.
He Jingxin etc. shows that the technology can be real by analyzing methane gas optical fiber passive detection technique under crude oil storage and transportation environment
Existing inflammable and explosive environment oil and gas detection, and have the characteristics that high-precision and stability.Jiang Desheng etc. is by carrying out storage tank operating parameter
The optical fiber sensing technology of monitoring is studied, and shows it with crude oil storage tank level sensing and alarm, storage tank detection of negative pressure and alarm, original
The features such as oil stream amount detection, water level sensing and signal transmit at a distance；Li Zhengying etc. is ground on the basis of Spectrum Absorption Principle
The fibre optical sensor and its system of the detection of the various mixed gases such as acetylene/methane, methane/carbon monoxide are made, not by two kinds
It is subject to the triangular modulation of different frequency with the laser of centre wavelength, two kinds of gas concentrations can be calculated through frequency analysis；Ginger
Tunable diode laser absorption spectrometry technology and optical division technology are rather used, multichannel optical fiber combustible gas monitoring system is formed.
The characteristics of Zhao Yanjie etc. influences semiconductor laser with tunable absorption spectrum formula gas-monitoring accuracy using temperature,
It is proposed a kind of optical fiber methane, temperature biparameter detecting system, it can be achieved that two kinds of methane, temperature parameter mutual corrections, gas-monitoring
It is measured with temperature.The principle and various multiplexings that Wang Yutian etc. changes the absorption of light with concentration under absorption peak wavelength based on gas
Technology, develops optical-fibre multi-channel methane transducer, and remote passive senses the safety that ensure that sensing probe scene, can apply to
The not applicable occasion of traditional sensors.But spectral absorption formula gas measurement technique is easy by light source, environment temperature, other gas
The interference of body absorption line etc. influences the last measurement accuracy of under test gas.And phase modulation-type long-period fiber grating gas
Body sensor can then avoid interfering, and based on cage molecule A to the highly selective feature of methane molecule, Yang Jianchun etc. proposes a kind of
Plated film long-period fiber grating methane transducer, the sensor have very high sensitivity to low-concentration methane gas.
Compared with long-period fiber grating, film-coating type, which tilts long-period fiber grating (TLPFG), then has higher refraction
Rate sensitivity, because TLPFG not only can excite core mode to high-order (l>1) covering mode coupling can also improve core mode and 1
The coefficient of coup of rank cladding mode.The inclination that Chen Haiyun etc. has studied plating high refractive index sensitive thin film in surface based on coupled mode theory is grown
Period optical fiber grating coupled characteristic and film refractive index sensing characteristics show refractive index sensitivity compared to non-inclined long period light
Fine grating improves an order of magnitude, to the resolution ratio of film refractive index up to 10-9.Yunhe Zhao etc. have studied different inclination angle
It is higher sensitive to show that the grating at larger angle of inclination has the variations in refractive index of surrounding for the TLPFG refractive index characteristics of degree
Degree.Xiaolin Xue have studied a kind of inclined optical fiber grating sensor, realize to being measured while temperature and refractive index, test
Show that the sensor has good temperature sensitivity and very high refractive index sensitivity.
Status both at home and abroad is analyzed, find current oil gas fuel gas detection technique mainly or is surveyed for mixed gas
Amount is shown in the fibre-optical sensing device of multiple gases in oil gas fuel gas (such as methane, ethane and propane) while detection not yet
Report, and inclined optical fiber grating is sensitiveer to external environment compared to other fibre optical sensors, therefore can be used for flammable to oil gas
The detection of gas.
Invention content
For the shortcomings of the prior art, to give full play to the measuring multiple parameters, (cage molecule containing cage molecule
A, cage molecule E- (OC3H7)6Or cage molecule M- (OC3H7)6) and graphene low-refraction ultraviolet light solidification fluorosilicone it is quick
Feel film the wavelength of oil gas volatilization main component high selectivity, inclination long-period fiber grating (TLPFG) is modulated and reflected
The features such as rate is sensitive, proposes a kind of gas concentration many reference amounts (main component methane, ethane, propane) measuring device, the sensing
Journey is to utilize (cage molecule A, cage molecule E- (OC containing cage molecule3H7)6Or cage molecule M- (OC3H7)6) and graphene
It is dense that the inclination long-period fiber grating of low-refraction ultraviolet light solidification fluorosilicone sensitive membrane measures methane, ethane, propane respectively
Degree, the humidity of environment and temperature conduct where being used in combination humidity fiber-optic grating sensor and Temperature fiber Grating Sensor to measure oil gas
To the temperature and humidity compensation of methane, ethane, propane sensor.Five sensors are realized same to many reference amounts of oil and gas environments by parallel connection
When measure, the measurement of namely for methane, ethane, propane concentration, temperature and humidity.
In order to solve the above-mentioned technical problem, present invention employs following technical solutions：
Oil gas many reference amounts detection sensing device, including the low-refraction of wideband light source, A containing cage molecule and graphene are ultraviolet
Inclination long-period fiber grating the methane transducer, (OC of E- containing cage molecule of light cured fluorine siloxanes sensitive membrane3H7)6And graphite
The inclination long-period fiber grating ethane sensor of the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of alkene contains cage molecule
M-(OC3H7)6The inclination long-period fiber grating propane for curing fluorosilicone sensitive membrane with the low-refraction ultraviolet light of graphene passes
Sensor, humidity fiber-optic grating sensor, Temperature fiber Grating Sensor, photoswitch I, photoswitch II, test gas chamber, computer and
Control methane, ethane, the input ratio of propane and nitrogen and by the methane of various concentration, ethane, propane input test gas chamber
Three mass flow controllers；The methane transducer, ethane sensor, propane sensor, temperature sensor and humidity sensor
The front end of device connects wideband light source by photoswitch I；The methane transducer, ethane sensor, propane sensor, temperature sensing
The rear end of device and humidity sensor connects spectroanalysis instrument by photoswitch II, and spectroanalysis instrument is connect with computer；The first
Alkane sensor, ethane sensor, propane sensor, humidity sensor and temperature sensor are located in test gas chamber, test gas chamber
Have and be passed through methane, ethane, the air inlet of propane mixture body and gas outlet to be measured, air inlet connection controls mixed gas to be measured
Three mass flow controllers；
The methane transducer is using inclination long-period fiber grating；The low-refraction of A containing cage molecule and graphene is purple
The preparation method of outer light cured fluorine siloxanes sensitive membrane is as follows：Cage molecule A is first dissolved in dichloromethane, it is then molten to the mixing
Low-refraction ultraviolet light solidification fluorosilicone and graphene are added in liquid, ultrasonator is used in combination to be uniformly mixed；Cage molecule A is
180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cure fluorosilicone 2mL, graphene 0.18g；A containing cage molecule and
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene, which is coated on, tilts long-period fiber grating cladding surface；
The ethane sensor is using inclination long-period fiber grating；(the OC of E- containing cage molecule3H7)6It is low with graphene
The preparation method that refractive index ultraviolet light cures fluorosilicone sensitive membrane is as follows：First by cage molecule E- (OC3H7)6It is dissolved in dichloromethane
Then low-refraction ultraviolet light solidification fluorosilicone and graphene is added in alkane into the mixed solution, be used in combination ultrasonator mixed
It closes uniform；Cage molecule E- (OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL,
Graphene 0.18g；(the OC of E- containing cage molecule3H7)6With the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane coating of graphene
In inclination long-period fiber grating cladding surface；
The propane sensor is using inclination long-period fiber grating；(the OC of M- containing cage molecule3H7)6It is low with graphene
The preparation method that refractive index ultraviolet light cures fluorosilicone sensitive membrane is as follows：First by cage molecule M- (OC3H7)6It is dissolved in dichloromethane
Then low-refraction ultraviolet light solidification fluorosilicone and graphene is added in alkane into the mixed solution, be used in combination ultrasonator mixed
It closes uniform；Cage molecule M- (OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL,
Graphene 0.18g；(the OC of M- containing cage molecule3H7)6With the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane coating of graphene
In inclination long-period fiber grating cladding surface；
The Fiber Bragg Grating Temperature sensor model number be OETMS-100A, range -50~120 DEG C, 9 μm/125 μm
Optical fiber, Canadian O/E Land companies.
The optical fiber Bragg raster humidity sensor model OEFHS-100A, centre wavelength 1550nm, range 10~
100%RH, 9 μm/125 μm optical fiber, Canadian O/E Land companies.
As a preferred embodiment of the present invention, long-period fiber grating is tilted by Corning SMF-28 single mode optical fiber by shaking
Width mask means makes, and parameter is 400~480 μm of screen periods, 10~20mm of grating length, 75 ° of angle of inclination, transmission loss
20~40dB, 1510~1590nm of resonance wavelength initial value.
As another preferred embodiment of the present invention, the low-refraction UV light of the A containing cage molecule and graphene
Change fluorosilicone sensitive membrane is high refractive index sensitive material, refractive index 1.851.
As another preferred embodiment of the present invention, (OC of E- containing cage molecule3H7)6With the low-refraction of graphene
It is high refractive index sensitive material, refractive index 1.843 that ultraviolet light, which cures fluorosilicone sensitive membrane,.
The scheme as an improvement of the present invention, (OC of M- containing cage molecule3H7)6It is purple with the low-refraction of graphene
Outer light cured fluorine siloxanes sensitive membrane is high refractive index sensitive material, refractive index 1.848.
As another improvement project of the present invention, the wideband light source uses the DL-CS5014A of centre wavelength 1550nm
Superradiance wideband light source SLD, bandwidth 40nm.
As the another step improvement project of the present invention, the spectroanalysis instrument is 600~1700nm wave-length coverages
Agilent86140B spectroanalysis instruments.
Compared with prior art, the present invention has the following technical effect that：
1, compared with existing long-period fiber grating methane transducer, tilt long-period fiber grating methane, ethane and
Propane sensor sensitivity, which has, to be increased substantially, this is because in tilting long-period fiber grating (TLPFG), Oblique refractive
Rate modulation not only can excite core mode to high-order (l>1) covering mode coupling can also improve the coupling of core mode and 1 rank cladding mode
Collaboration number, thus the spectrum refractive index variation of TLPFG has higher response sensitivity, i.e., it is quicker to sensitive membrane variations in refractive index
Sense.
2, cage molecule A is to methane, cage molecule E- (OC3H7)6To ethane and cage molecule M- (OC3H7)6To propane point
Not Ju You specific adsorption characteristic, and the refractive index of its material can change with the difference of gas concentration so that
These materials have very high sensitivity and selectivity to corresponding gas.This is because cage molecule A, cage molecule E-
(OC3H7)6, cage molecule M- (OC3H7)6Cavity size be different from that (wherein inner cavity window size is respectively ), these cavitys respectively with methane, ethane, propane phase
Match；After methane, ethane, propane respectively enter in corresponding material molecule cavity, meeting formation complex compound in combination changes material
The dipole moment for expecting molecule, to change the refractive index of material.
3, using many reference amounts device measured to methane, ethane, propane, temperature and humidity, and light path switching and
Spectroanalysis instrument is demodulated, and can realize highly sensitive, the highly selective measurement to fuel gas in oil gas.Light path switching passes through
Photoswitch is realized, is realized to methane transducer, ethane sensor, propane sensor, temperature sensor using time-division multiplex technology
With the real-time measurement of humidity sensor.Meanwhile temperature-humidity sensor can not only monitor the epidemic disaster of oil and gas environments in real time, protect
The safety of oil-gas storage is demonstrate,proved, measured value can also correct influence of the epidemic disaster to methane, ethane, propane sensor in real time,
It realizes and the epidemic disaster of gas sensor is compensated.The present invention have measuring multiple parameters, high sensitivity, stability is high, selectivity is good
The features such as being compensated with epidemic disaster.
4, by containing cage molecule (cage molecule A, cage molecule E- (OC3H7)6Or cage molecule M- (OC3H7)6) and stone
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of black alkene is to methane, ethane, propane gas high selectivity, inclination long week
The combination of the wavelength modulation of phase fiber grating and the hypersensitivity and 100~250nm film thicknesses of refractive index, makes biography
Sensor high sensitivity, fast response time.
Description of the drawings
Fig. 1 is the structural schematic diagram that oil gas many reference amounts detect sensing device.
Fig. 2 is the structural schematic diagram of methane transducer, ethane sensor and propane sensor.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of oil gas many reference amounts detection sensing device includes wideband light source, A containing cage molecule and graphene
Low-refraction ultraviolet light solidification fluorosilicone sensitive membrane inclination long-period fiber grating methane transducer, E- containing cage molecule
(OC3H7)6Cure the inclination long-period fiber grating ethane sensing of fluorosilicone sensitive membrane with the low-refraction ultraviolet light of graphene
The device, (OC of M- containing cage molecule3H7)6Cure the inclination long period of fluorosilicone sensitive membrane with the low-refraction ultraviolet light of graphene
Fiber grating propane sensor, Temperature fiber Grating Sensor, photoswitch I, photoswitch II, is surveyed humidity fiber-optic grating sensor
Gas testing room, computer and control methane, ethane, the input ratio of propane and nitrogen and methane, ethane, propane by various concentration
Three mass flow controllers of input test gas chamber.Methane transducer, ethane sensor, propane sensor, temperature sensor
Wideband light source is connected by photoswitch I with the front end of humidity sensor.Methane transducer, ethane sensor, propane sensor, temperature
The rear end for spending sensor and humidity sensor connects spectroanalysis instrument by photoswitch II, and spectroanalysis instrument is connect with computer.
Methane transducer, ethane sensor, propane sensor, humidity sensor and temperature sensor are located in test gas chamber, test gas
Room, which has, is passed through methane, ethane, the air inlet of propane mixture body and gas outlet to be measured, and air inlet connection controls mixed gas to be measured
Three mass flow controllers (i.e. mass flow controller I, mass flow controller II and mass flow controller III).
Methane transducer is using inclination long-period fiber grating, the low-refraction ultraviolet light of A containing cage molecule and graphene
The preparation method for curing fluorosilicone sensitive membrane is as follows：Cage molecule A is first dissolved in dichloromethane, then into the mixed solution
Low-refraction ultraviolet light solidification fluorosilicone and graphene is added, ultrasonator is used in combination to be uniformly mixed；Cage molecule A is 180 μ
Mol, dichloromethane 20mL, low-refraction ultraviolet light cure fluorosilicone 2mL, graphene 0.18g；A containing cage molecule and graphite
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of alkene, which is coated on, tilts long-period fiber grating cladding surface.Ethane senses
Device is using inclination the long-period fiber grating, (OC of E- containing cage molecule3H7)6Cure fluorine silicon with the low-refraction ultraviolet light of graphene
The preparation method of oxygen alkane sensitive membrane is as follows：First by cage molecule E- (OC3H7)6It is dissolved in dichloromethane, then into the mixed solution
Low-refraction ultraviolet light solidification fluorosilicone and graphene is added, ultrasonator is used in combination to be uniformly mixed；Cage molecule E-
(OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL, graphene 0.18g；Containing cage
Shape molecule E- (OC3H7)6It is coated on the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene and tilts long period optical fiber
Grating cladding surface.Propane sensor is using inclination the long-period fiber grating, (OC of M- containing cage molecule3H7)6It is low with graphene
The preparation method that refractive index ultraviolet light cures fluorosilicone sensitive membrane is as follows：First by cage molecule M- (OC3H7)6It is dissolved in dichloromethane
Then low-refraction ultraviolet light solidification fluorosilicone and graphene is added in alkane into the mixed solution, be used in combination ultrasonator mixed
It closes uniform；Cage molecule M- (OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL,
Graphene 0.18g；(the OC of M- containing cage molecule3H7)6With the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane coating of graphene
In inclination long-period fiber grating cladding surface.
It tilts long-period fiber grating to be made by amplitude mask method by Corning SMF-28 single mode optical fiber, parameter is grating
400~480 μm of period, 10~20mm of grating length, 75 ° of angle of inclination, 20~40dB of transmission loss, resonance wavelength initial value
1510~1590nm.It is high refractive index that the low-refraction ultraviolet light of A containing cage molecule and graphene, which cures fluorosilicone sensitive membrane,
Sensitive material, refractive index 1.851.(the OC of E- containing cage molecule3H7)6Cure fluorine silicon with the low-refraction ultraviolet light of graphene
Oxygen alkane sensitive membrane is high refractive index sensitive material, refractive index 1.843.(the OC of M- containing cage molecule3H7)6It is low with graphene
It is high refractive index sensitive material, refractive index 1.848 that refractive index ultraviolet light, which cures fluorosilicone sensitive membrane,.Cage molecule A, cage
Shape molecule E- (OC3H7)6, cage molecule M- (OC3H7)6Molecular weight be respectively 894.99,1090.39,1104.41；Inner cavity window
Mouthful size is respectivelyIt can be respectively only to methane, ethane and third
Alkane gas has response, to the non-measured gas such as oxygen, nitrogen, carbon dioxide, carbon monoxide, hydrogen sulfide almost without response, performance
Go out good selectivity.Humidity sensor and temperature sensor produce for Canadian O/E Land companies.Wideband light source uses
DL-CS5014A superradiance the wideband light source SLD, bandwidth 40nm of centre wavelength 1550nm.Photoswitch I and photoswitch II are
The 1X8FSW-OSW of iseelink companies.Spectroanalysis instrument is the Agilent 86140B spectrum of 600~1700nm wave-length coverages
Analyzer.It is the grating resonance wave after sensor contacts under test gas to tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement Δ λ
Long and the aerial grating resonance wavelength of sensor difference.
The course of work of the detection device is as follows：
(1) course of work of single unit system
As shown in Figure 1.Light is sent out by wideband light source, and by photoswitch I, (in the present embodiment, photoswitch I is using 1 into 8 light extractions
Switch) it is connect with methane transducer, ethane sensor, propane sensor, humidity sensor and temperature sensor, in photoswitch I
Remaining 3 outlets are vacant.The rear end of methane transducer, ethane sensor, propane sensor, humidity sensor and temperature sensor
Spectroanalysis instrument is connected by photoswitch II, spectroanalysis instrument is connected with computer again.Methane transducer, ethane sensor,
Propane sensor, humidity sensor and temperature sensor are placed on simultaneously in test gas chamber, three mass flow controller controls
The input ratio of methane processed, ethane, propane and nitrogen, the methane, ethane, propane of various concentration are persistently inputted by air inlet
Gas chamber is tested, test gas chamber gas outlet is in opening-wide state always, so that the gas in test gas chamber is excluded.
(2) course of work of single branch sensor
The structure of methane transducer, ethane sensor and propane sensor be it is identical, as shown in Figure 2 (in Fig. 2,1 for containing
The low-refraction ultraviolet light of cage molecule A and graphene cures fluorosilicone sensitive membrane, and 2 be covering, and 3 be inclination long period optical fiber
Grating, 4 be fiber core), fiber grating inclination is scribed in fiber core 4.Incident light enters fiber core 4, emergent light from
Fiber core 4 is emitted.The inclination long-period fiber grating period is Λg.It tilts long-period fiber grating and uses Corning SMF-28 list
Mode fiber is made by amplitude mask method, and parameter is 400~480 μm of screen periods, 10~20mm of grating length, transmission loss
20~40dB, 1520~1580nm of resonance wavelength initial value, angle of inclination are 75 °；Using dip-coating method by cage molecule A and
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene is coated on 2 surface of long-period fiber grating covering；It is healthy and free from worry
9 μm or so of SMF-28 single mode optical fibers core diameter, 125 μm of cladding diameter.
In the low-refraction ultraviolet light for tilting 2 surface of long-period fiber grating covering preparation A containing cage molecule and graphene
Cure fluorosilicone methane the sensitive membrane 1, (OC of E- containing cage molecule3H7)6Cure fluorine silica with the low-refraction ultraviolet light of graphene
Alkane ethane the sensitive membrane, (OC of M- containing cage molecule3H7)6It is sensitive with the low-refraction ultraviolet light solidification fluorosilicone propane of graphene
The process of film is as follows：
(1) distilled water, absolute ethyl alcohol, acetone etc. is used to be carried out respectively to tilting long-period fiber grating cladding surface successively
Cleaning, is put into 60 DEG C of dry 20min in vacuum drying chamber after cleaning.
(2) 180 μm of ol cage molecules A, cage molecule E- (OC are weighed3H7)6, cage molecule M- (OC3H7)6, it is dissolved in
Then 20mL dichloromethane low-refraction ultraviolet light is added into the mixed solution and cures fluorosilicone 2mL, graphene 0.18g,
It is used in combination ultrasonator to stir to form uniformly mixed solution.
(3) the solidification fluorosilicone containing the low-refraction ultraviolet light of cage molecule and graphene is slowly applied with dip-coating method
It is layed onto inclined optical fiber grating cladding surface, applies the inclined optical fiber grating for being covered with film slowly to extract out, pull rate 11cm/min.
(4) inclined optical fiber grating for having been coated with sensitive membrane is put into vacuum drying chamber, 50 DEG C~60 DEG C keep the temperature 2 hours, obtain
Obtain the good sensitive membrane of uniformity；By repeatedly coating, it is 100~250nm to make sensitive film thickness.
Methane transducer, ethane sensor are different with the size of propane sensor three only cage molecule, other all sames,
It is also identical including its sensing principle.Therefore it is introduced by taking methane as an example here.
Tilt Resonant Wavelengths of Long Period Fiber Gratings λmIt is given by：
Wherein,For fibre core effective index of fundamental mode,For m rank covering Effective indexes, ΛgTo tilt long week
Fiber grating period phase.
When various concentration methane gas and A containing cage molecule and stone coated on inclination long-period fiber grating cladding surface
When the low-refraction ultraviolet light solidification fluorosilicone methane sensitive membrane contact of black alkene, methane sensitive membrane refractive index changes, and
The variation of sensitive membrane refractive index will lead to covering Effective indexVariation, and then keep fibre core basic mode and cladding mode effective
Refractive index difference changes；Due to grating period AgFor definite value, Resonant Wavelengths of Long Period Fiber Gratings λ in above formulamIt also will hair
Changing；And resonance wavelength amount of movement Δ λ is demodulated by spectra methods, and grating resonance wave is detected using spectroanalysis instrument
Long situation of movement passes through grating resonance wavelength before and after analysis methane transducer contacting methane gasmAmount of movement Δ λ, establish
Relationship between concentration of methane gas c and grating resonance wavelength amount of movement Δ λ；Detection methane transducer connects with methane gas to be measured
Touch front and back grating resonance wavelength amount of movement Δ λ, you can obtain concentration of methane gas to be measured, humidity sensor and temperature sensing is used in combination
The value that device measures compensates amount of movement Δ λ.
The course of work of ethane and propane sensor is identical as the above, and details are not described herein.
Embodiment 1
Tilt the methane transducer, ethane sensor and propane sensing of long-period fiber grating cladding surface coating sensitive membrane
Device, 400 μm of screen periods, periodicity 40, grating length 16mm, 75 ° of angle of inclination, transmission loss be respectively 32.6dB, 31dB,
33.5dB, resonance wavelength initial value are respectively 1558.54nm, 1559.6nm, 1558.0nm.With methane concentration (0~5% (v/
V)), the calibrating gas that ethane concentration (0~2.9% (v/v)) and propane concentration are (0~2.1% (v/v)) is object, respectively
Have an effect with the sensitive membrane of grating cladding surface, grating resonance wavelength with methane, ethane and propane gas concentration increase and to
Long wave length direction moves, and linear related between resonance wavelength amount of movement and methane, ethane and propane concentration.
Use known methane concentration for the methane Standard Gases of 0,0.5,1.0,2.5,3.5,4.0,5.0% (v/v) in experiment
Body is detected, corresponding methane grating resonance wavelength amount of movement Δ λ1Respectively 0,0.63,1.06,2.38,3.23,4.10,
4.50nm, equation of linear regression are：Δλ1=0.9174c1+ 0.1090, coefficient R2=0.990, c in formula1For first to be measured
Alkane gas concentration, Δ λ1To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known ethane concentration for the ethane Standard Gases of 0,0.5,1.0,1.5,2.0,2.5,2.9% (v/v) in experiment
Body is detected, corresponding methane grating resonance wavelength amount of movement Δ λ2Respectively 0,0.50,0.98,1.35,1.84,2.32,
2.75nm, equation of linear regression are：Δλ2=0.9300c2+ 0.0097, coefficient R2=0.998, c in formula2For second to be measured
Alkane gas concentration, Δ λ2To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known propane concentration for the propane Standard Gases of 0,0.5,0.7,1.0,1.3,1.7,2.1% (v/v) in experiment
Body is detected, corresponding ethane grating resonance wavelength amount of movement Δ λ3Respectively 0,0.36,0.64,0.93,1.20,1.58,
1.95nm, equation of linear regression are：Δλ3=0.9475c3- 0.0367, coefficient R2=0.996, c in formula3It is to be measured third
Alkane gas concentration, Δ λ3To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Simultaneously with fiber-optical grating temperature sensor and fiber bragg grating temperature sensor measure this experiment gas chamber temperature and
Humidity is respectively 25 DEG C, 56%RH.
After the sensitive membrane of methane gas to be measured and grating cladding surface contacts, grating resonance wavelength amount of movement Δ λ1For
1.7nm can calculate concentration of methane gas c to be measured1=1.7%, response speed is 40 seconds, and recovery time is 50 seconds；When waiting for
After survey ethane gas is contacted with the sensitive membrane of grating cladding surface, grating resonance wavelength amount of movement Δ λ2For 1nm, it can calculate and wait for
Survey ethane gas concentration c2=0.9%, response speed is 41 seconds, and recovery time is 52 seconds；When propane gas to be measured and grating
After the sensitive membrane contact of cladding surface, grating resonance wavelength amount of movement Δ λ3For 1.7nm, propane gas concentration to be measured can be calculated
c3=1.7%, response speed is 41 seconds, and recovery time is 50 seconds.
The temperature response curve of methane transducer, ethane sensor, propane sensor is measured, temperature is by fiber Bragg light
Grid temperature sensor is demarcated.Grating resonance wavelength increases with temperature and is moved to long wave length direction, and resonance wavelength moves
Amount is linear related between temperature.
Known temperature is used to be detected for 20,30,40,60,80,100 DEG C in experiment, corresponding methane grating resonance wavelength
Amount of movement Δ λ4Respectively 0,0.05,0.08,0.13,0.17,0.21nm, equation of linear regression is：Δλ4=0.0025T-
0.0311, coefficient R2=0.976；Corresponding ethane grating resonance wavelength amount of movement Δ λ5Respectively 0,0.04,0.07,0.13,
0.16,0.22nm, equation of linear regression are：Δλ5=0.0026T-0.0414, coefficient R2=0.986；Corresponding propane light
Grid resonance wavelength amount of movement Δ λ6Respectively 0,0.06,0.07,0.12,0.16,0.21nm, equation of linear regression is：Δλ6=
0.0024T-0.0298, coefficient R2=0.992.T is that methane, ethane and propane sensor wait for testing temperature, Δ λ in formula4For
Methane tilts Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ5Resonant Wavelengths of Long Period Fiber Gratings movement is tilted for ethane
Amount, Δ λ6Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
The humidity response curve of methane transducer, ethane sensor, propane sensor is measured, humidity is by fiber Bragg light
Grid humidity sensor is demarcated.Grating resonance wavelength increases with humidity and is moved to shortwave length direction, and resonance wavelength moves
Amount is linear related between humidity.
Known humidity is used to be detected for 20,30,40,60,80,100%RH in experiment, corresponding methane grating resonance wave
Long amount of movement Δ λ7Respectively 0, -0.02, -0.05, -0.08, -0.11, -0.14nm, equation of linear regression is：Δλ7=-
0.0017H+0.0283, coefficient R2=0.986；Corresponding ethane grating resonance wavelength amount of movement Δ λ8Respectively 0, -0.01, -
0.04, -0.07, -0.11, -0.13nm, equation of linear regression are：Δλ8=-0.0017H+0.0338, coefficient R2=
0.986；Corresponding propane grating resonance wavelength amount of movement Δ λ8Respectively 0, -0.01, -0.04, -0.07, -0.11, -0.13nm,
Its equation of linear regression is：Δλ8=-0.0017H+0.0338, coefficient R2=0.986.H is methane, ethane and third in formula
Alkane sensor waits for measuring moisture, Δ λ7Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ are tilted for methane8It tilts and grows for ethane
Period optical fiber grating resonance wavelength amount of movement, Δ λ8Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
So final methane transducer, ethane sensor, propane sensor are under epidemic disaster compensation, linear equation divides
It is not：
Temperature when T indicates to measure, humidity when H indicates to measure.
Methane transducer：
Δλ1=0.9174c1+0.1090-[0.0025(T-25)-0.0311]-[-0.0017(H-56)+0.0283]
Ethane sensor：
Δλ2=0.9300c2+0.0097-[0.0026(T-25)-0.0414]-[-0.0017(H-56)+0.0338]
Propane sensor：
Δλ3=0.9475c3-0.0367-[0.0024(T-25)-0.0298]-[-0.0016(H-56)+0.0280]。
Embodiment 2
Tilt the methane transducer, ethane sensor and propane sensing of long-period fiber grating cladding surface coating sensitive membrane
Device, 430 μm of screen periods, periodicity 40, grating length 17.2mm, 75 ° of angle of inclination, transmission loss be respectively 31.5dB,
32.4dB, 32.9dB, resonance wavelength initial value are respectively 1557.64nm, 1558.4nm, 1557.5nm.With methane concentration (0~
5% (v/v)), ethane concentration (0~2.9% (v/v)) and propane concentration be the calibrating gas of (0~2.1% (v/v)) be pair
As the sensitive membrane with grating cladding surface is had an effect respectively, and grating resonance wavelength increases with methane, ethane and propane gas concentration
Add and moved to long wave length direction, and is linear related between resonance wavelength amount of movement and methane, ethane and propane concentration.
Use known methane concentration for the methane Standard Gases of 0,0.5,1.0,2.5,3.5,4.0,5.0% (v/v) in experiment
Body is detected, corresponding methane grating resonance wavelength amount of movement Δ λ1Respectively 0,0.72,1.08,2.42,3.20,4.15,
4.60nm, equation of linear regression are：Δλ1=0.9230c1+ 0.1343, coefficient R2=0.990, c in formula1For first to be measured
Alkane gas concentration, Δ λ1To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known ethane concentration for the ethane Standard Gases of 0,0.5,1.0,1.5,2.0,2.5,2.9% (v/v) in experiment
Body is detected, corresponding ethane grating resonance wavelength amount of movement Δ λ2Respectively 0,0.65,1.12,1.43,1.99,2.50,
2.85nm, equation of linear regression are：Δλ2=0.9578c2+ 0.0827, coefficient R2=0.994, c in formula2For second to be measured
Alkane gas concentration, Δ λ2To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known propane concentration for the propane Standard Gases of 0,0.5,0.7,1.0,1.3,1.7,2.1% (v/v) in experiment
Body is detected, corresponding propane grating resonance wavelength amount of movement Δ λ3Respectively 0,0.39,0.68,0.97,1.26,1.62,
1.97nm, equation of linear regression are：Δλ3=0.9575c3- 0.0143, coefficient R2=0.996, c in formula3It is to be measured third
Alkane gas concentration, Δ λ3To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Simultaneously with fiber-optical grating temperature sensor and fiber bragg grating temperature sensor measure the secondary experiment gas chamber temperature and
Humidity is respectively 26 DEG C, 65%RH.
After the sensitive membrane of methane gas to be measured and grating cladding surface contacts, grating resonance wavelength amount of movement Δ λ1For
1.2nm can calculate concentration of methane gas c to be measured1=1.1%, response speed is 43 seconds, and recovery time is 52 seconds；When waiting for
After survey ethane gas is contacted with the sensitive membrane of grating cladding surface, grating resonance wavelength amount of movement Δ λ2For 1.5nm, can calculate
Ethane gas concentration c to be measured2=1.5%, response speed is 42 seconds, and recovery time is 51 seconds；When propane gas to be measured and light
After the sensitive membrane contact of grid cladding surface, grating resonance wavelength amount of movement Δ λ3For 1.1nm, it is dense that propane gas to be measured can be calculated
Spend c3=1%, response speed is 42 seconds, and recovery time is 52 seconds.
The temperature response curve of methane transducer, ethane sensor, propane sensor is measured, temperature is by fiber Bragg light
Grid temperature sensor is demarcated.Grating resonance wavelength increases with temperature and is moved to long wave length direction, and resonance wavelength moves
Amount is linear related between temperature.
Known temperature is used to be detected for 20,30,40,60,80,100 DEG C in experiment, corresponding methane grating resonance wavelength
Amount of movement Δ λ4Respectively 0,0.04,0.07,0.12,0.16,0.20nm, equation of linear regression is：Δλ4=0.0024T-
0.0354, coefficient R2=0.986；Corresponding ethane grating resonance wavelength amount of movement Δ λ5Respectively 0,0.03,0.06,0.14,
0.17,0.21nm, equation of linear regression are：Δλ5=0.0027T-0.0460, coefficient R2=0.974；Corresponding propane light
Grid resonance wavelength amount of movement Δ λ6Respectively 0,0.05,0.08,0.12,0.15,0.20nm, equation of linear regression is：Δλ6=
0.0023T-0.0262, coefficient R2=0.968.T is that methane, ethane and propane sensor wait for testing temperature, Δ λ in formula4For
Methane tilts Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ5Resonant Wavelengths of Long Period Fiber Gratings movement is tilted for ethane
Amount, Δ λ6Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
The humidity response curve of methane, ethane, propane sensor is measured, humidity is by optical fiber Bragg raster humidity sensor
It is demarcated.Grating resonance wavelength increases with humidity and is moved to shortwave length direction, and between resonance wavelength amount of movement and humidity
It is linear related.
Known humidity is used to be detected for 20,30,40,60,80,100%RH in experiment, corresponding methane grating resonance wave
Long amount of movement Δ λ7Respectively 0, -0.02, -0.04, -0.07, -0.11, -0.15nm, equation of linear regression is：Δλ7=-
0.0018H+0.0363, coefficient R2=0.998；Corresponding ethane grating resonance wavelength amount of movement Δ λ8Respectively 0, -0.02, -
0.04, -0.06, -0.10, -0.14nm, equation of linear regression are：Δλ8=-0.0017H+0.0326, coefficient R2=
0.990；Corresponding propane grating resonance wavelength amount of movement Δ λ9Respectively 0, -0.02, -0.05, -0.08, -0.12, -0.16nm,
Its equation of linear regression is：Δλ9=-0.0020H+0.0366, coefficient R2=0.994.H is methane, ethane and third in formula
Alkane sensor waits for measuring moisture, Δ λ7Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ are tilted for methane8It tilts and grows for ethane
Period optical fiber grating resonance wavelength amount of movement, Δ λ8Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
So final methane transducer, ethane sensor, propane sensor are under epidemic disaster compensation, linear equation divides
It is not：
Temperature when T indicates to measure, humidity when H indicates to measure.
Methane transducer：
Δλ1=0.9230c1+0.1343-[0.0024(T-26)-0.0354]-[-0.0018(H-65)+0.0363]
Ethane sensor：
Δλ2=0.9578c2+0.0827-[0.0027(T-26)-0.0460]-[-0.0017(H-65)+0.0326]
Propane sensor：
Δλ3=0.9575c3-0.0143-[0.0023(T-26)-0.0262]-[-0.0020(H-65)+0.0366]。
Embodiment 3
Tilt the methane transducer, ethane sensor and propane sensing of long-period fiber grating cladding surface coating sensitive membrane
Device, 450 μm of screen periods, periodicity 40, grating length 18mm, 75 ° of angle of inclination, transmission loss be respectively 32.5dB,
32.8dB, 33.9dB, resonance wavelength initial value is respectively 1556.68nm, 1558.6nm, 1557.2nm.With methane concentration (0~
5% (v/v)), ethane concentration (0~2.9% (v/v)) and propane concentration be the calibrating gas of (0~2.1% (v/v)) be pair
As the sensitive membrane with grating cladding surface is had an effect respectively, and grating resonance wavelength increases with methane, ethane and propane gas concentration
Add and moved to long wave length direction, and is linear related between resonance wavelength amount of movement and methane, ethane and propane concentration.
Use known methane concentration for the methane Standard Gases of 0,0.5,1.0,2.5,3.5,4.0,5.0% (v/v) in experiment
Body is detected, corresponding methane grating resonance wavelength amount of movement Δ λ1Respectively 0,0.78,1.12,2.46,3.24,4.19,
4.66nm, equation of linear regression are：Δλ1=0.9281c1+ 0.1624, coefficient R2=0.988, c in formula1For first to be measured
Alkane gas concentration, Δ λ1To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known ethane concentration for the ethane Standard Gases of 0,0.5,1.0,1.5,2.0,2.5,2.9% (v/v) in experiment
Body is detected, corresponding ethane grating resonance wavelength amount of movement Δ λ2Respectively 0,0.70,1.22,1.50,2.04,2.56,
2.95nm, equation of linear regression are：Δλ2=0.9774c2+ 0.1151, coefficient R2=0.992, c in formula2For second to be measured
Alkane gas concentration, Δ λ2To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Use known propane concentration for the propane Standard Gases of 0,0.5,0.7,1.0,1.3,1.7,2.1% (v/v) in experiment
Body is detected, corresponding propane grating resonance wavelength amount of movement Δ λ3Respectively 0,0.41,0.71,0.98,1.29,1.64,
1.99nm, equation of linear regression are：Δλ3=0.9641c3- 0.0025, coefficient R2=0.996, c in formula3It is to be measured third
Alkane gas concentration, Δ λ3To tilt Resonant Wavelengths of Long Period Fiber Gratings amount of movement.
Simultaneously with fiber-optical grating temperature sensor and fiber bragg grating temperature sensor measure the secondary experiment gas chamber temperature and
Humidity is respectively 28 DEG C, 60%RH.
After the sensitive membrane of methane gas to be measured and grating cladding surface contacts, grating resonance wavelength amount of movement Δ λ1For
2.2nm can calculate concentration of methane gas c to be measured1=2.2%, response speed is 41 seconds, and recovery time is 53 seconds；When waiting for
After survey ethane gas is contacted with the sensitive membrane of grating cladding surface, grating resonance wavelength amount of movement Δ λ2For 1.8nm, can calculate
Ethane gas concentration c to be measured2=1.9%, response speed is 42 seconds, and recovery time is 53 seconds；When propane gas to be measured and light
After the sensitive membrane contact of grid cladding surface, grating resonance wavelength amount of movement Δ λ3For 1.5nm, it is dense that propane gas to be measured can be calculated
Spend c3=1.4%, response speed is 40 seconds, and recovery time is 52 seconds.
The temperature response curve of methane transducer, ethane sensor, propane sensor is measured, temperature is by fiber Bragg light
Grid temperature sensor is demarcated.Grating resonance wavelength increases with temperature and is moved to long wave length direction, and resonance wavelength moves
Amount is linear related between temperature.
Known temperature is used to be detected for 20,30,40,60,80,100 DEG C in experiment, corresponding methane grating resonance wavelength
Amount of movement Δ λ4Respectively 0,0.03,0.07,0.12,0.16,0.21nm, equation of linear regression is：Δλ4=0.0026T-
0.0435, coefficient R2=0.990；Corresponding ethane grating resonance wavelength amount of movement Δ λ5Respectively 0,0.05,0.08,0.13,
0.17,0.21nm, equation of linear regression are：Δλ5=0.0025T-0.0311, coefficient R2=0.976；Corresponding propane light
Grid resonance wavelength amount of movement Δ λ6Respectively 0,0.04,0.07,0.12,0.17,0.22nm, equation of linear regression is：Δλ6=
0.0027T-0.0437, coefficient R2=0.994.T is that methane, ethane and propane sensor wait for testing temperature, Δ λ in formula4For
Methane tilts Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ5Resonant Wavelengths of Long Period Fiber Gratings movement is tilted for ethane
Amount, Δ λ6Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
The humidity response curve of methane transducer, ethane sensor, propane sensor is measured, humidity is by fiber Bragg light
Grid humidity sensor is demarcated.Grating resonance wavelength increases with humidity and is moved to shortwave length direction, and resonance wavelength moves
Amount is linear related between humidity.
Known humidity is used to be detected for 20,30,40,60,80,100%RH in experiment, corresponding methane grating resonance wave
Long amount of movement Δ λ7Respectively 0, -0.03, -0.06, -0.08, -0.13, -0.17nm, equation of linear regression is：Δλ7=-
0.0020H+0.0334, coefficient R2=0.986；Corresponding ethane grating resonance wavelength amount of movement Δ λ8Respectively 0, -0.03, -
0.05, -0.08, -0.12, -0.16nm, equation of linear regression are：Δλ8=-0.0019H+0.0320, coefficient R2=
0.994；Corresponding propane grating resonance wavelength amount of movement Δ λ9Respectively 0, -0.04, -0.07, -0.11, -0.15, -0.19nm,
Its equation of linear regression is：Δλ9=-0.0023H+0.0317, coefficient R2=0.984.H is methane, ethane and third in formula
Alkane sensor waits for measuring moisture, Δ λ7Resonant Wavelengths of Long Period Fiber Gratings amount of movement, Δ λ are tilted for methane8It tilts and grows for ethane
Period optical fiber grating resonance wavelength amount of movement, Δ λ8Resonant Wavelengths of Long Period Fiber Gratings amount of movement is tilted for propane.
So final methane transducer, ethane sensor, propane sensor are under epidemic disaster compensation, linear equation divides
It is not：
Temperature when T indicates to measure, humidity when H indicates to measure.
Methane transducer：
Δλ1=0.9281c1+0.1624-[0.0026(T-28)-0.0435]-[-0.0020(H-60)+0.0334]
Ethane sensor：
Δλ2=0.9774c2+0.1151-[0.0025(T-28)-0.0311]-[-0.0019(H-60)+0.0320]
Propane sensor：
Δλ3=0.9641c3-0.0025-[0.0027(T-28)-0.0437]-[-0.0023(H-60)+0.0317]。
Claims (7)
1. a kind of gas concentration many reference amounts detection device, including wideband light source, photoswitch I, photoswitch II, test gas chamber, calculating
Machine, spectroanalysis instrument are connect with computer, it is characterised in that：Further include A containing cage molecule and graphene low-refraction it is ultraviolet
Inclination long-period fiber grating the methane transducer, (OC of E- containing cage molecule of light cured fluorine siloxanes sensitive membrane3H7)6And graphite
The inclination long-period fiber grating ethane sensor of the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of alkene contains cage molecule
M-(OC3H7)6The inclination long-period fiber grating propane for curing fluorosilicone sensitive membrane with the low-refraction ultraviolet light of graphene passes
The input ratio of sensor, humidity fiber-optic grating sensor, Temperature fiber Grating Sensor and control methane, ethane, propane and nitrogen
Example and by the methane of various concentration, three mass flow controllers of ethane, propane input test gas chamber；The methane sensing
Device, ethane sensor, propane sensor, Temperature fiber Grating Sensor and humidity fiber-optic grating sensor front end opened by light
Close I connection wideband light source；The methane transducer, ethane sensor, propane sensor, Temperature fiber Grating Sensor and humidity
The rear end of fiber-optic grating sensor connects spectroanalysis instrument by photoswitch II；The methane transducer, ethane sensor, propane
Sensor, humidity fiber-optic grating sensor and Temperature fiber Grating Sensor are located in test gas chamber, and test gas chamber, which is passed through, to be waited for
Methane, ethane, the air inlet of propane mixture body and gas outlet are surveyed, air inlet connection controls three quality of mixed gas to be measured
Flow controller；
The methane transducer is using inclination long-period fiber grating；The low-refraction ultraviolet light of A containing cage molecule and graphene
The preparation method for curing fluorosilicone sensitive membrane is as follows：Cage molecule A is first dissolved in dichloromethane, is then added into mixed solution
Enter low-refraction ultraviolet light solidification fluorosilicone and graphene, ultrasonator is used in combination to be uniformly mixed；Cage molecule A is 180 μ
Mol, dichloromethane 20mL, low-refraction ultraviolet light cure fluorosilicone 2mL, graphene 0.18g；A containing cage molecule and graphite
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of alkene, which is coated on, tilts long-period fiber grating cladding surface；
The ethane sensor is using inclination long-period fiber grating；(the OC of E- containing cage molecule3H7)6The low refraction with graphene
The preparation method that rate ultraviolet light cures fluorosilicone sensitive membrane is as follows：First by cage molecule E- (OC3H7)6It is dissolved in dichloromethane, so
Low-refraction ultraviolet light solidification fluorosilicone and graphene are added in the backward mixed solution, is used in combination ultrasonator mixing equal
It is even；Cage molecule E- (OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL, graphite
Alkene 0.18g；(the OC of E- containing cage molecule3H7)6It is coated on and inclines with the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene
Plagioclase period optical fiber grating cladding surface；
The propane sensor is using inclination long-period fiber grating；(the OC of M- containing cage molecule3H7)6The low refraction with graphene
The preparation method that rate ultraviolet light cures fluorosilicone sensitive membrane is as follows：First by cage molecule M- (OC3H7)6It is dissolved in dichloromethane, so
Low-refraction ultraviolet light solidification fluorosilicone and graphene are added in the backward mixed solution, is used in combination ultrasonator mixing equal
It is even；Cage molecule M- (OC3H7)6For 180 μm of ol, dichloromethane 20mL, low-refraction ultraviolet light cures fluorosilicone 2mL, graphite
Alkene 0.18g；(the OC of M- containing cage molecule3H7)6It is coated on and inclines with the low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene
Plagioclase period optical fiber grating cladding surface.
2. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：Tilt long-period fiber grating
It is made by amplitude mask method by Corning SMF-28 single mode optical fiber, parameter is 400~480 μm of screen periods, grating length 10
~20mm, 75 ° of angle of inclination, 20~40dB of transmission loss, 1510~1590nm of resonance wavelength initial value.
3. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：The A containing cage molecule and
The low-refraction ultraviolet light solidification fluorosilicone sensitive membrane of graphene is high refractive index sensitive material, refractive index 1.851.
4. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：The E- containing cage molecule
(OC3H7)6Low-refraction ultraviolet light solidification fluorosilicone sensitive membrane with graphene is high refractive index sensitive material, refractive index
It is 1.843.
5. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：The M- containing cage molecule
(OC3H7)6Low-refraction ultraviolet light solidification fluorosilicone sensitive membrane with graphene is high refractive index sensitive material, refractive index
It is 1.848.
6. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：During the wideband light source uses
DL-CS5014A superradiance the wideband light source SLD, bandwidth 40nm of the long 1550nm of cardiac wave.
7. gas concentration many reference amounts detection device according to claim 1, it is characterised in that：The spectroanalysis instrument is
The Agilent 86140B spectroanalysis instruments of 600~1700nm wave-length coverages.
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