CN207540970U - A kind of humidity sensor based on graphene oxide coating optical fiber - Google Patents
A kind of humidity sensor based on graphene oxide coating optical fiber Download PDFInfo
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- CN207540970U CN207540970U CN201721239089.2U CN201721239089U CN207540970U CN 207540970 U CN207540970 U CN 207540970U CN 201721239089 U CN201721239089 U CN 201721239089U CN 207540970 U CN207540970 U CN 207540970U
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- optical fiber
- graphene oxide
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- humidity
- humidity sensor
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Abstract
The utility model is related to technical field of optical fiber, and in particular to preparation method, humidity sensor and its application of graphene oxide coating optical fiber.The light fibre humidity transducer based on graphene oxide of the utility model, including：Wideband light source, optical fiber sensor head, graphene oxide, spectrometer；The first input port of the optical fiber sensor head is connect with wideband light source by optical fiber, and the first output port is connect with spectrometer by optical fiber；The optical fiber sensor head is made of three sections of optical fiber, and three sections of optical fiber sequences form Mach-Zehnder interferometer structure, and wherein second segment optical fiber is located at centre；One layer of graphene oxide plating is coated on the second segment optical fiber surface of the optical fiber sensor head.The sensor of the utility model has that simple in structure, at low cost, easy to operate, measurement range is larger, high certainty of measurement, high resolution and the advantages of have a wide range of application.
Description
Technical field
The utility model is related to humidity sensor technical field more particularly to a kind of preparations of graphene oxide coating optical fiber
Method, the humidity sensor based on the graphene oxide coating optical fiber and the method using the humidity sensor measurement humidity.
Background technology
The humidity physical quantity important as one, it is closely bound up with human lives and national product.On the one hand, ambient humidity
It is very big to the health effect of the mankind.On the other hand, in fields such as industrial and agricultural production, meteorology, environmental protection, life, space flight, national defence,
It needs to be detected ambient humidity and control.Such extensive demand is based on, humidity measuring method is constantly opened up
Exhibition and growth.The method of general measure humidity has flexible method, measurement with wet, condensation dew point method, lithium chloride dew point method, resistance capacitance
Method, electrolysis and gravimetric method.But these conventional measuring method devices are all complex, and sensitivity is limited, compared with
To be also difficult to realize the measurement of humidity under rugged environment.In the increasingly accurate scientific research of measuring technique, this deviation is past
Large effect is caused to result of study toward meeting.It can be very good to evade these problems, example to measure humidity currently with optical fiber
Mach-Zehnder fibre optic interferometers, Michelson fibre optic interferometers, Fabry-Perot interference sensors and light can such as be used
Fine Sagnac interference sensors measure humidity.
However, it is existing measure humidity fiber instrument there are detection sensitivity it is relatively low the problem of.
Utility model content
In view of this, it is necessary to for it is above-mentioned the problem of, a kind of humidity based on graphene oxide coating optical fiber is provided and is passed
Sensor and its application.
To achieve the above object, the utility model takes following technical solution：
The humidity sensor based on graphene oxide coating optical fiber of the utility model, including：Wideband light source, Fibre Optical Sensor
Head, graphene oxide, spectrometer；
The first input port of the optical fiber sensor head is connect with wideband light source by optical fiber, the first output port and spectrum
Instrument is connected by optical fiber；Two-beam in Mach-Zehnder interferometer inside optical fiber sensor head interferes when transmitting, Ran Houchuan
It is defeated to arrive spectrometer；
The optical fiber sensor head is made of three sections of optical fiber, and three sections of optical fiber sequences form mach-zehnder interferometer configuration,
Middle second segment optical fiber is located at centre, and first segment optical fiber and third section optical fiber are located at second segment optical fiber both ends；
One layer of graphene oxide is coated on the surface of the second segment optical fiber of the optical fiber sensor head.
Further, the light fibre humidity transducer further includes computer, and the computer communicates with spectrometer output terminal
Connection.The computer is used to receive the output data of spectrometer and calculates refractive index and temperature.
Further, the mach-zehnder interferometer configuration inside the optical fiber sensor head is optical fiber pigtail.
Further, the central shaft of the first segment optical fiber and third section optical fiber coincides.
Further, economically consider from cost, three sections of optical fiber are ordinary optic fibre, and optical fiber pigtail is ordinary optic fibre
Tail optical fiber.And the ordinary optic fibre can be selected as single mode optical fiber.
Further, the wideband light source is the fiber broadband light source of C-band 1520nm-1570nm, each component connection
Between Transmission Fibers be general single mode fiber.
Graphene oxide coating on the surface of the second segment optical fiber of the optical fiber sensor head of the utility model is used with lower section
Method carries out plated film：
Step 1, optical fiber surface 5- is respectively washed using 0.5-2mol/L acetone, 0.5-2mol/L hydrochloric acid successively at room temperature
15 minutes；
Step 2, it is dried after cleaning one time again with deionized water；
Step 3, then second segment optical fiber in 3- aminopropyl triethoxysilanes (APTES) aqueous solution soaking 1-3 hours；
Step 4, optical fiber is cleaned with ethyl alcohol, is placed in the environment of temperature is 50-55 DEG C and is dried after cleaning；
Step 5, the second segment optical fiber handled by step 4 is immersed 0.01-0.1mg/mL) graphene oxide water solution
In, temperature is controlled at 50-55 DEG C；After it is observed that graphene oxide is successfully plated in second segment optical fiber, second segment light
Fibre removes；After making its natural drying at room temperature, entire coating process is completed.
Further, it is small that the second segment optical fiber handled through step 2 is immersed to 0.5-2 in the NaOH solution of 0.8-1.5mol/L
When.
Preferably, the 3- aminopropyl triethoxysilanes (APTES) in water a concentration of 5%.
Further, the graphene oxide coating on the surface of the second segment optical fiber of the optical fiber sensor head is using a concentration of
The graphene oxide water solution of 0.06mg/mL carries out plated film.
The light fibre humidity transducer based on Mach-Zehnder interferometer and graphene oxide plated film of the utility model calculates
The rule that machine changes with space environment humidity to be measured according to the valley wavelength of interference fringe and changed, calculates space environment to be measured
Humidity.
Using the method for the above-mentioned humidity sensor measurement humidity based on graphene oxide coating optical fiber, specially：By light
Fine sensing head is put into space environment to be measured, is interfered in two light beams of inside of optical fibre transmission, the wavelength of interference fringe trough
Change with the variation of the space environment humidity to be measured residing for optical fiber sensor head, interference fringe is measured by spectrometer and computer
The moving range of valley wavelength, then the humidity of space environment to be measured is calculated through computer.
In above-mentioned measuring method, when the humidity of environment space to be measured changes, item is interfered by spectrometer detection
The moving range of line valley wavelength, to get to the humidity of space environment to be measured after computer is calculated.
When core mode and the phase difference of i rank cladding modes being excitedWhen, trough wavelength is：
Wherein, λmin,kRepresent the trough wavelength of interference output spectra that i ranks cladding mode and fibre core Mode interference generate.WithThe effective refractive index of fibre core and the effective refractive index of i rank cladding modes being excited are represented respectively.
The beneficial effects of the utility model are：
The sensor of the utility model has that simple in structure, at low cost, easy to operate, measurement range is larger, measurement accuracy
High, high resolution and the advantages of have a wide range of application.
The sensor of the utility model is other than being used for the moisture measurement of general environment space, it may also be used for small
Variation, the moisture measurement of environment space under hazardous environment.The utility model can also measure humidity in real time.
Description of the drawings
Fig. 1 is the humidity sensor structure diagram based on graphene oxide coating optical fiber；
Fig. 2 be measure Fibre Optical Sensor header structure and with the schematic diagram at solution mass interface to be measured；
Fig. 3 is transmission spectrum of the fibre optical sensor in the case where humidity is the space environment of RH=30%；
It is respectively 30% that Fig. 4, which is Mach-Zehnder interferometer in space environment humidity, transmission when 40%, 50%, 60%
Spectrum；
Fig. 5 is when space environment humidity changes to 60% from 30%, and sensor interferometer striped valley wavelength is
Mobile fitting rule during 1545.7nm.
Reference numeral：1st, wideband light source；2nd, optical fiber sensor head；202nd, first segment optical fiber；203rd, third section optical fiber；204th,
Two sections of optical fiber；3rd, graphene oxide；4th, spectrometer；5th, computer；6th, covering；7th, space environment to be measured.
Specific embodiment
To make the purpose of this utility model, technical solution and advantage clearer, implement below in conjunction with the utility model
Example further clearly and completely describes the technical solution of the utility model work.It should be noted that described embodiment
Only the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, ability
It is new to belong to this practicality for domain those of ordinary skill all other embodiments obtained without making creative work
The range of type protection.
Embodiment
Referring to Fig. 1, the light fibre humidity transducer based on Mach-Zehnder interferometer and graphene oxide includes wideband light source 1,
Optical fiber sensor head 2, graphene oxide 3, spectrometer 4.Wherein, wideband light source 1 is connected to the first input end of optical fiber sensor head 2
Mouthful, the first output port connection spectrometer 4 of optical fiber sensor head 2.As preference, computer 5 can be set as at data
Device is managed, the computer 5 and spectrometer 4 communicate to connect, and carry out data processing.
Fig. 2 be measure Fibre Optical Sensor header structure and with the schematic diagram at solution mass interface to be measured.The optical fiber passes
Sense head 2 forms mach-zehnder interferometer configuration by the optical fiber of three sections of dislocation.It is preferably located at 204 both ends of second segment ordinary optic fibre
First segment ordinary optic fibre 202 and third section ordinary optic fibre 203 center overlapping of axles, 204 surface of second segment ordinary optic fibre plates
One layer of graphene oxide 3.The air with certain humidity is filled with inside space environment 7 wherein to be measured.
In the utility model, the wideband light source 1 is the wideband light source 1 of C-band (1520nm~1570nm).Transmit light
Fibre is single mode optical fiber.
When measuring, optical fiber sensor head 2 is put into space environment 7 to be measured, and the corresponding data detected is input to
Computer 5 obtains the moving range of interference fringe valley wavelength by calculating, and detected space environment is obtained according to matched curve
Humidity.The principle that interference fringe valley wavelength changes with the variation for measuring the space environment humidity to be measured residing for optical fiber sensor head
It is as follows：
Since optical fiber misplaces, Mach-Zehnder interferometer is formed so that the light beam transmitted in single mode optical fiber is divided into two-beam biography
It broadcasts, it is a branch of in fibre core, it is a branch of in covering 6.The path of two-beam transmission is different, can generate the phase difference of accumulation each other
2πΔnL1/ λ, wherein Δ n are the refringences of the light beam transmitted between fibre core and covering 6, L1It is the length of optical fiber dislocation, λ is
The wavelength of input.When the humidity variation for the space environment to be measured that fibre optical sensor is surveyed, it can cause the beam Propagation in covering 6
Path change, the phase difference between two light beams can also change so that the valley wave of the interference fringe between them
It is long that corresponding movement occurs.
Graphene oxide 3 is a kind of derivative of important graphene, it is rich in oxygen-containing functional group, such as：Hydroxyl, carboxylic
Base, epoxides and carbonyl etc..This makes it have many unique characteristics, such as：Dispersibility, hydrophily and great ratio
Surface area.Exactly these characteristics allow graphene oxide 3 to be acted with outside water molecule, therefore can be plated in light
Fibre optical sensor is made in fine surface.The effective refractive index of graphene oxide 3 can change with the variation of external environment humidity,
It is corresponding mobile so as to which the valley wavelength of spectrum be caused to occur.The humidity of sensor is obtained by detecting the movement of valley wavelength
Sensitivity.
Wherein, K is fringe visibility, IcoreAnd IcladIt is the light intensity of fibre core and covering 6 respectively.
As shown in Fig. 2, the light that light source is sent out enters optical fiber sensor head 2 from first segment optical fiber 202, in first segment optical fiber 202
In wide part transmitted in fibre core, by the rear portion of first misconstruction optically coupling in covering 6, remaining one
Light splitting is still transmitted in fibre core, since the propagation path of two-beam is different, by that can generate stable phase after stretch journey
Potential difference by covering 6 after second dislocation is coupled in fibre core and generates interference with core mode again.As shown in figure 3, for light in sky
Transmission spectrum when air humidity degree is 30%.Therefore, the variation of interference strength can be represented by the following formula：
Wherein, K is fringe visibility, IcoreAnd IcladIt is the light intensity of fibre core and covering 6 respectively.
Theoretically, work as Icore≈IcladWhen, K reaches maximum value.So control dislocation length is just particularly important.Fibre core
Mould and the phase difference of cladding mode being excited can change with the variation of external environment.It can be represented by following formula：
Wherein,WithIt is the effective refractive index of core mode and i ranks covering 6 respectively, d is between two misconstructions
Distance, λ is the operation wavelength in vacuum,Be fibre core basic mode and i ranks covering 6 effective refractive index it is poor.
WhenMinimum intensity of light wavelength can be expressed as：
When carrying out 3 plated film of graphene oxide to optical fiber sensor head 2, first have to carry out the surface of optical fiber using chemical method
Processing enables graphene oxide 3 to be more prone to and uniformly adsorb in optical fiber surface, it is often more important that can improve sensor
Moisture measurement sensitivity, that is, be successively respectively washed optical fiber surface using acetone and hydrochloric acid (concentration is 1mol/L) at room temperature
10 minutes, another purpose was to remove the organic pollution of optical fiber surface.Then, it is cleaned one time and dried again with deionized water.
In order to increase the quantity of the silanol group of optical fiber surface, sensing head is immersed in NaOH (1mol/L) solution 1 hour.Then, then
Optical fiber is immersed 3- aminopropyl triethoxysilanes (APTES) solution 2 hours, 3- aminopropyl triethoxysilanes (APTES) with
The hydroxyl interaction of optical fiber silica surface, so as to form Si-O-Si covalent bonds.Optical fiber is cleaned with ethyl alcohol again, cleans it
After to be placed on temperature to carry out drying 30 minutes, temperature in the environment of 50 DEG C be that 50 DEG C of environment is realized by climatic chamber.Most
Afterwards, treated optical fiber sensor head 2 is immersed in 3 solution of graphene oxide of 0.06mg/mL, temperature is controlled at 50 DEG C.When
It is observed that graphene oxide 3 is successfully plated in after optical fiber sensor head 2, it is molten that optical fiber sensor head 2 is removed graphene oxide 3
Liquid.Its natural drying is made just to complete entire coating process after 12 hours at room temperature.
Due to the presence of oxygen-containing functional group, 3 film of graphene oxide has very strong water imbibition.When extraneous ambient humidity
During variation, 3 film of graphene oxide is absorbed by hydrone.Since hydrone is filled into 3 film of graphene oxide, lead to oxygen
3 film of graphite alkene becomes larger.With the increase of hydrone, the effective refractive index of graphene oxide 3 will reduce therewith.Finally
The effective refractive index that may result between 3 film of covering 6 and graphene oxide becomes smaller.
Further to verify the feasibility of the utility model, spy carries out following experiment：
In an experiment, using the transmission under the conditions of different humidity in the fiber sensor measuring space environment of the utility model
Spectrogram.As shown in figure 4, it is respectively 30%, 40%, 50% that four curves, which correspond to optical fiber sensor head 2 to be positioned over humidity, in figure,
Transmission spectrum in 60% space environment.Wherein, optical fiber longitudinal length (the second segment optical fiber 204 of Mach-Zehnder interferometer dislocation
Length) it is about 3.5cm, lateral length (misplace length) is 5 μm.It is from fig. 4, it can be seen that dry in Mach-Zehnder interferometer
Relate to striped valley wavelength put with optical fiber sensor head 2 space environment humidity increase and increase.
Fig. 5 be using the utility model fibre optical sensor to the data result of the different humidity under space environment to be measured with
Fitting result.From fig. 5, it can be seen that humidity is by 30% to 60% variation range in space environment to be measured, matched curve energy
Enough accurate matching measurement results, the linearity 99.61%.Mach-Zehnder interferometer can be obtained for wet from matched curve
The detectivity of degree is 0.104dB/%RH.In general scientific research range, this sensitivity can reach corresponding requirement.
From experiment it is found that although transmission spectrum interference fringe valley wavelength changes at any time and at random, due to its with
Time change very little, that is, it is feasible to illustrate this sensor stability.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (5)
1. a kind of humidity sensor based on graphene oxide coating optical fiber, which is characterized in that including：Wideband light source, optical fiber pass
Feel head, graphene oxide, spectrometer；
The first input port of the optical fiber sensor head is connect with wideband light source by optical fiber, and the first output port leads to spectrometer
Cross optical fiber connection；Two-beam in Mach-Zehnder interferometer inside optical fiber sensor head interferes when transmitting, and is then communicated to
Spectrometer；
The optical fiber sensor head is made of three sections of optical fiber, and three sections of optical fiber sequences form mach-zehnder interferometer configuration；Wherein
Two sections of optical fiber are located at centre, and first segment optical fiber and third section optical fiber are located at second segment optical fiber both ends；
One layer of graphene oxide is coated on the surface of the second segment optical fiber of the optical fiber sensor head.
2. the humidity sensor according to claim 1 based on graphene oxide coating optical fiber, which is characterized in that the light
Fine humidity sensor further includes computer, and the computer is communicated to connect with spectrometer output terminal；The computer is used to receive
The output data of spectrometer simultaneously calculates refractive index and temperature.
3. the humidity sensor according to claim 1 based on graphene oxide coating optical fiber, which is characterized in that the light
Mach-zehnder interferometer configuration inside fine sensing head is the optical fiber pigtail for removing covering.
4. the humidity sensor according to claim 1 based on graphene oxide coating optical fiber, which is characterized in that described
Wideband light source is the fiber broadband light source of C-band 1520nm-1570nm, and the Transmission Fibers between each component connection are general single mode
Optical fiber.
5. the humidity sensor according to claim 1 based on graphene oxide coating optical fiber, which is characterized in that described
The central shaft of one section of optical fiber and third section optical fiber coincides.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561039A (en) * | 2017-09-26 | 2018-01-09 | 华南师范大学 | Preparation method, humidity sensor and its application of graphene oxide coating optical fiber |
| CN110208215A (en) * | 2019-05-15 | 2019-09-06 | 华南师范大学 | A kind of humidity sensor based on graphene oxide Michelson's interferometer |
| CN110207760A (en) * | 2019-07-08 | 2019-09-06 | 南京信息工程大学 | The fibre optical sensor and preparation method thereof of temperature and humidity is detected simultaneously |
| CN111044088A (en) * | 2019-12-12 | 2020-04-21 | 天津理工大学 | Humidity and stress double-parameter micro optical fiber sensor based on carbon nano tube compound |
| CN112730325A (en) * | 2020-12-23 | 2021-04-30 | 汕头大学 | Preparation method of coated optical fiber, coated optical fiber and refractive index detection device |
-
2017
- 2017-09-26 CN CN201721239089.2U patent/CN207540970U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561039A (en) * | 2017-09-26 | 2018-01-09 | 华南师范大学 | Preparation method, humidity sensor and its application of graphene oxide coating optical fiber |
| CN110208215A (en) * | 2019-05-15 | 2019-09-06 | 华南师范大学 | A kind of humidity sensor based on graphene oxide Michelson's interferometer |
| CN110207760A (en) * | 2019-07-08 | 2019-09-06 | 南京信息工程大学 | The fibre optical sensor and preparation method thereof of temperature and humidity is detected simultaneously |
| CN111044088A (en) * | 2019-12-12 | 2020-04-21 | 天津理工大学 | Humidity and stress double-parameter micro optical fiber sensor based on carbon nano tube compound |
| CN112730325A (en) * | 2020-12-23 | 2021-04-30 | 汕头大学 | Preparation method of coated optical fiber, coated optical fiber and refractive index detection device |
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