CN107101951B - A kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring - Google Patents
A kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 95
- 239000001257 hydrogen Substances 0.000 title claims abstract description 89
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 89
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 239000004038 photonic crystal Substances 0.000 claims abstract description 50
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- 238000001228 spectrum Methods 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 26
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 25
- 230000002463 transducing effect Effects 0.000 claims abstract description 11
- 239000010409 thin film Substances 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 description 20
- 238000005259 measurement Methods 0.000 description 13
- 239000010408 film Substances 0.000 description 11
- 239000012528 membrane Substances 0.000 description 8
- 238000005253 cladding Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
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- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 208000025174 PANDAS Diseases 0.000 description 1
- 208000021155 Paediatric autoimmune neuropsychiatric disorders associated with streptococcal infection Diseases 0.000 description 1
- 240000000220 Panda oleosa Species 0.000 description 1
- 235000016496 Panda oleosa Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
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- 230000002269 spontaneous effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
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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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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Abstract
The invention proposes a kind of fibre optical sensors for density of hydrogen and temperature simultaneously measuring, including light source part, pass light part, transducing part, gas supply part and optical detector part, transducing part includes optic fibre environment and photonic crystal fiber, and wherein optic fibre environment includes three-dB coupler and high birefringence optical fiber；The transducing part is set to gas supply partial interior, and the output end of wide spectrum light source and the input terminal of spectroanalysis instrument pass through single mode optical fiber respectively and connect with three-dB coupler one end；High birefringence optical fiber both ends pass through single mode optical fiber respectively and connect with three-dB coupler both ends；One section of photonic crystal fiber is connected on the single mode optical fiber that spectroanalysis instrument is connect with three-dB coupler, coats hydrogen sensitive film in the periphery of photonic crystal fiber, subsidence area is respectively set in photonic crystal fiber both ends.Highly sensitive, the long-range real-time detection to gas concentration and temperature can be achieved in the combination of optic fibre environment and photonic crystal fiber, and increases the safety of monitoring hydrogen.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, it is related to a kind of combining based on photonic crystal fiber and fiber loop mirror
Fibre optical sensor for density of hydrogen and temperature simultaneously measuring.
Background technique
Hydrogen is a kind of cleaning and the reusable energy, is widely used in auto industry, aerospace, chemistry and adds
The every field such as work.Due to the high diffusivity (0.16cm of hydrogen2/ s), low burning point (0.018mJ) and very wide explosive range
(4%-75%), hydrogen are easily revealed and are set off an explosion.It can be seen that the hydrogen sensing technology of research and development hypostazation is to grind
Study carefully Hydrogen Energy, utilize Hydrogen Energy and the most important condition for preventing hydrogen from endangering.The transducing signal of traditional electrochemical transducer[sensor is telecommunications
Number, there is the potential danger for the hydrogen that ignites and is difficult to realize the single selective of hydrogen.Compared to traditional electrochemical hydrogen
Sensor, Optical Fider Hybrogen Sensor with high security, not by electromagnetic interference, the advantages such as telemeasurement, be suitable for hydrogen this
The detection of kind hazardous gas, receives significant attention.Most gas sensor is easy to be caused to measure by the interference of environment temperature
Inaccurate (document 1.Yu J, Li J, and Dai Q.Temperature compensation and data fusion
based on a multifunctional gas detector[J].IEEE Transactions on
Instrumentation and Measurement,2015,64(1):204-211.).Therefore, research can monitor hydrogen simultaneously
The fibre optical sensor of gas concentration and temperature is necessary.
Grating type hydrogen gas sensor makes it not based on wavelength modulation to be influenced by light source fluctuation, and fiber bragg grating
Have the advantages that relatively easy structure, distributed measurement and small in size, many hydrogen gas sensors based on fiber bragg grating
It rapidly develops.However need by carrying out some special treatment process such as Side polishing fibers and corrosion to optical fiber, to realize pair
The quick response of nm grades of sensitive thin films, this can reduce the mechanical performance of sensor, influence the reliability monitored for a long time, and in this
The sensitivity of sensor after treatment it is not high compared to for other kinds of hydrogen gas sensor (document 2.Z.P.Yu,
L.Jin,L.J.Chen,J.Li,Y.Ran,B.O.Guan.Microfiber Bragg grating hydrogen sensors
[J].IEEE Photonics Technology Letters,2015,27(24):2575-2578.).Most of optical fiber hydrogen
Sensor is all the measurement for considering only density of hydrogen, though measurement hydrogen sensitivity it is higher, but in environment temperature change
Changing can be sensitive to the sensing arrangement generation Temperature cross-over for coating hydrogen sensitive film, so as to cause the inaccurate of density of hydrogen measurement
(document 3.Xu B, Zhao C L, Yang F, Gong H P, Wang D N, Dai J X, Yang M H.Sagnac
interferometer hydrogen sensor based on panda fiber with Pt-loaded WO3/
SiO2coating[J].Optics Letters,2016,41(7):1594-1597.).In addition, some hydrogen gas sensors are benefits
Chemical reaction releasing heat occurs with sensitive membrane and hydrogen to change the temperature around sensor to realize the survey of density of hydrogen
Measure (document 4.Hu T Y, Wang D N, Wang M, Li Z, and Yang M H.Miniature hydrogen sensor
based on fiber inner cavity and Pt-doped WO3coating[J].IEEE Photonics
Technology Letters, 2014,26 (14): 1458-1461.), although which realizes the survey of higher sensitivity
Amount, equally increases the risk of hydrogen explosion.
In order to realize density of hydrogen and temperature simultaneously measuring, 2014 Nian Wangmin et al. propose using Mach-Zehnder interferometer and
Fiber bragg grating carries out density of hydrogen and temperature simultaneously measuring (document 5.Wang M, Wang D N, Yang M H, Cheng
J,and Li J Y.In-line Mach-Zehnderinterferometer and FBG with Pd film for
simultaneous hydrogen and temperature detection[J].Sensors and Actuators B:
Chemical,2014,202:893-896.).The Mach-Zehnder interferometer of coating palladium film measures density of hydrogen sensitive
It spends up to 70pm/%, while being 6pm/ DEG C to the sensitivity of temperature, and fiber bragg grating is insensitive to density of hydrogen, it is right
The sensitivity of temperature only reaches 4pm/%.The sensitivity of measurement hydrogen in article is lower, and the optical fiber as temperature-compensating
The temperature sensitivity of Bragg grating is relatively low, can not eliminate the influence of Temperature cross-over sensitivity well.In order to improve hydrogen
The safety that gas uses not only needs to consider to improve the sensitivity of density of hydrogen measurement, it is also necessary to consider the influence of temperature change,
It therefore, is very necessary to the double monitoring of density of hydrogen and temperature.
Summary of the invention
It is an object of the invention to propose that a kind of structure is simple, be easily achieved, highly-safe, high sensitivity and right simultaneously
The novel optical fiber sensor that density of hydrogen and temperature measure.
In order to achieve the above object, the present invention proposes
A kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring, including light source part, biography light part, sensing
Partially, gas supply part and optical detector part, wherein light source part is wide spectrum light source, and passing light part includes single mode optical fiber, gas supply
Part is the space of the density of hydrogen environment of setting, and optical detector part is spectroanalysis instrument, and transducing part includes optic fibre environment
And photonic crystal fiber, wherein optic fibre environment includes three-dB coupler and high birefringence optical fiber；The transducing part is set to confession
Gas partial interior, the output end of wide spectrum light source and the input terminal of spectroanalysis instrument pass through single mode optical fiber and three-dB coupler one respectively
End connection；High birefringence optical fiber both ends pass through single mode optical fiber respectively and connect with three-dB coupler both ends；Spectroanalysis instrument and 3dB coupling
One section of photonic crystal fiber is connected on the single mode optical fiber of clutch connection, coating hydrogen sensitive is thin in the periphery of photonic crystal fiber
Film, length is consistent with photonic crystal fiber length, and subsidence area is respectively set in photonic crystal fiber both ends.
Further, described to pass through photonic crystal fiber and the interference spectrum resonance wavelength position by optic fibre environment generation
Difference, to distinguish the sensitive variation to density of hydrogen and temperature.Since two kinds of interference spectrum resonance wavelength positions are different, so
The interference spectrum generated after two interference superpositions can generate two kinds of easily distinguishable resonance paddy, both resonance paddy are respectively to hydrogen
Concentration and temperature are sensitive, and the amount of movement by monitoring them respectively obtains the variable quantity of density of hydrogen and temperature.
The invention has the benefit that
1) this density of hydrogen combined based on photonic crystal fiber and fiber loop mirror proposed by the present invention and temperature are same
When the fibre optical sensor that measures, the photonic crystal fiber that will coat sensitive thin film pops one's head in as hydrogen sensitive, fiber loop mirror conduct
Temperature measurement unit, highly sensitive, the long-range real-time detection to gas concentration and temperature can be achieved in the combination of the two, and increases
The safety of monitoring hydrogen.
2) it using photonic crystal fiber as hydrogen sensing unit, is easy to collapse generation higher order mode by simple welding
Into photonic crystal fiber covering, and it can use photonic band gap effects constraint cladding mode and stablize transmission.With non-structure of film
It compares, the cladding mode of photonic crystal fiber is more limited in internal layer, between this sensitive membrane and covering with high refractive index
It influences each other related.The loss decline of core mode simultaneously, and transmission intensity stability is preferable.Finally with inside cladding mode
Coupling produces a stronger interference effect.The above result shows that having plated the hydrogen sensitive of high refractive index in photonic crystal fiber
Film can be improved the quality of intermode interference.
Detailed description of the invention
Fig. 1 is that the density of hydrogen provided by the invention combined based on photonic crystal fiber and fiber loop mirror and temperature are surveyed simultaneously
Measure overall system architecture schematic diagram；
Fig. 2 is spectroscopic studying figure of the Optical Fider Hybrogen Sensor provided by the invention under different hydrogen concentration；
Fig. 3 is that the curve of Optical Fider Hybrogen Sensor provided by the invention two kinds of resonance troughs under different hydrogen concentration is quasi-
It closes；
Fig. 4 is the spectroscopic studying figure of Optical Fider Hybrogen Sensor provided by the invention at different temperatures；
Fig. 5 be Optical Fider Hybrogen Sensor provided by the invention at different temperatures two kinds resonance trough curve matching；
In figure: 1 wide spectrum light source；2 single mode optical fibers；33dB coupler；4 high birefringence optical fibers；5 hydrogen sensitive films；6 photons
Crystal optical fibre；7 subsidence areas；8 spectrometers；9 gas chambers.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing is described in further detail specific structure of the invention, principle and experimentation.
Embodiment 1
A kind of optical fiber biography of the density of hydrogen combined based on photonic crystal fiber and fiber loop mirror and temperature simultaneously measuring
Sensor, including light source part, biography light part, transducing part, gas supply part, optical detector part.Light source part uses laboratory
In spontaneous radiation wide spectrum light source, output power 5.0-10mW/dBm, operation wavelength meets and uses in 1520-1640nm
It is required that.It passes light part and uses single mode optical fiber, optical fiber tie jumper head is then needed to carry out turning for optical signal when biography light part is longer
It connects.YOKOGAWA Yokogawa AQ6370 spectroanalysis instrument (OSA), wave-length coverage 600- are used in optical detection part Experiment
1700nm completely covers transmitting light source light spectrum signal.Gas supply part is that detection system tests the important component built, real
The air distribution system for testing design detaches residual gas in pipeline first with vacuum pump.Next gas supply gas source is opened from gas tank
Gas out first controls the flow of every road gas through flowmeter, enters back into mixing chamber and is uniformly mixed.Finally it is passed through measurement gas chamber
In, stable density of hydrogen atmosphere is formed, is sensed by the sensitive structure perception concentration variation of transducing part.
In the structure, the refractive index of the sensitive membrane of photonic crystal fiber coating can reduce with the increase of density of hydrogen,
Simultaneously in view of the chemical reaction that sensitive membrane and hydrogen occur can release heat so as to cause sensitive membrane expanded by heating, in this process
Middle photonic crystal fiber will receive stress.When temperature transmitting variation in environment, the photonic crystal fiber of sensitive membrane is coated
It will receive influence, the Temperature cross-over sensitivity of generation results in the inaccurate of measurement.In addition, the easy increase hydrogen of the variation of temperature is quick-fried
Fried danger.Fiber loop mirror temperature sensitivity with higher and unique spectrum, the knot of photonic crystal fiber and fiber loop mirror
Conjunction can be realized two-parameter measurement.
Fig. 1 is that the density of hydrogen provided by the invention combined based on photonic crystal fiber and fiber loop mirror and temperature are surveyed simultaneously
Measure overall system architecture schematic diagram.The light that light source issues enters three-dB coupler from single mode optical fiber, and it is equal by force to be then divided into two-beam
Light, respectively along transmitting clockwise and counterclockwise in ring, due to the birefringence effect of high birefringence optical fiber so that
The two-beam transmitted in opposite direction in fiber loop mirror generates optical path difference, interferes when two-beam meets in coupler again.
For whole system, the input of photonic crystal fiber is the output spectrum of fiber loop mirror, coats the light of hydrogen sensitive film
For photonic crystal fiber since the presence of both ends subsidence area forms another interference spectrum, the output of last whole system is two kinds of sensings
The variable quantity of density of hydrogen and temperature can be obtained in the superposition interference spectrum of unit, the amount of movement by monitoring different resonance paddy.
The output spectrum of fiber loop mirror indicates are as follows:
In formula, θ1And θ2It is the rotation angle of incident light fast (slow) axis when outputting and inputting high birefringence optical fiber, B is Gao Shuan
The birefringent of optical fiber is reflected, L is the length of high birefringence optical fiber.The period of High-Birefringence Fiber Loop Mirror transmission spectrum are as follows:
The amount of movement Δ λ of change in temperature Δ T and resonance trough wavelengthdipRelationship may be expressed as:
In formula, Δ B is influenced by thermo-optic effect, CtIt is thermo-optical coeffecient.It is birefringent to send out when external environment variation
Changing, therefore, resonant wavelength can move.
By the present invention in that preparing hydrogen sensitive film with sol-gal process, and sensitivity is coated on photonic crystal fiber
Film, so that the sensing arrangement is to hydrogen sensitive.Light enters from input terminal single mode optical fiber, behind first subsidence area, one
Light splitting is coupled in the fibre core of photonic crystal fiber to be transmitted with core mode；Another part is optically coupled to the packet of photonic crystal fiber
Continue to transmit with cladding mode in layer.During this, the propagation of core mode and cladding mode in photonic crystal fiber is normal
Number is different, after transmitting a certain distance length, can there is phase delay between both of which.Finally, when two parts optical transport
When to second subsidence area, the cladding mode of sensitive zones is being exported with the core mode transmitted in photonic crystal fiber fibre core
It is interfered in single mode optical fiber, forms interference effect.Interference spectrum may be expressed as:
Wherein, I is the output intensity of interference signal, I1And I2It is the light intensity of two beam interferometer light in photonic crystal fiber,It is
The phase difference of both of which, δ are initial phases.Phase difference and central wavelength may be expressed as:
Wherein, neff1And neff2It is the effective refractive index of core mode and cladding mode, L is the length of interference region, Δ
neffIt is two specific refractivities, λ is free optical wavelength, λmIt is m-th of interference wavelength.
When density of hydrogen increases, sensitive membrane and hydrogen react, and the refractive index of film reduces therewith, photonic crystal fiber
Interfere wavelength mobile to shortwave length direction.During this, due to the chemical reaction be it is exothermic, cause sensitive membrane to be heated swollen
It is swollen, certain stress can be applied to photonic crystal fiber, interference spectrum is equally as shortwave length direction is mobile.Therefore, hydrogen is dense
Degree can pass through the mobile acquisition of monitoring interference spectrum.However, the variation of temperature can generate centainly the measurement of density of hydrogen
It influences, and increases the danger of hydrogen explosion.Fiber loop mirror temperature sensitivity with higher, and its spectrum and photon are brilliant
The interference spectrum of body optical fiber, which combines, to be easy to differentiate, the not phase of the sensitivity and photonic crystal fiber to temperature and density of hydrogen
Together, thus using fiber loop mirror and photonic crystal fiber measurement while being implemented in combination with two-parameter.
The photonic crystal fiber for the use of length being 19.5mm in the present invention forms 120 μm at the both ends of photonic crystal fiber
Subsidence area, make its generate resonance wavelength 1551.5nm spectrum；Use the optical fiber for the high birefringence optical fiber that length is 72mm
Ring mirror makes it generate the spectrum of resonance wavelength 1595.39nm, passes in conjunction with above-mentioned spectrum, to form integrated optical fiber
Sensor carries out the experiment measured while density of hydrogen and temperature.It is as shown in Figure 2 experimental system when density of hydrogen changes
Spectrogram.With the increase of density of hydrogen, the interference spectrum of photonic crystal fiber is mobile to shortwave length direction, with theory analysis
It is consistent.Be fitted respectively as shown in Figure 3 two in Fig. 2 resonance troughs with density of hydrogen variable quantity.It can be seen that the sensing
The hydrogen sensitivity of device can reach -1.12nm/%, simultaneously as fiber loop mirror is by the disturbance in environment, the trough that resonates has can
The fluctuation ignored.In the measurement process of temperature, as shown in figure 4, movement all has occurred in two resonance troughs, it is carried out respectively
As shown in figure 5, photonic crystal fiber has been actually subjected to the influence of temperature in environment, movement is had occurred in interference spectrum for fitting.The same time
Fine ring mirror realizes higher temperature sensitivity.Therefore, the mobile Δ λ of the interference wavelength of photonic crystal fiber1And fiber loop mirror
The mobile Δ λ of resonant wavelength2It may be expressed as:
Wherein, Δ C indicates the variation of density of hydrogen, and Δ T indicates the variation of temperature in environment.The variation and temperature of density of hydrogen
The variation of degree has resulted in the resonant wavelength Δ λ of two kinds of interferometers1With Δ λ2Movement.In addition, Δ λ1With Δ λ2To Δ C and Δ T
There is different sensitivity.Therefore, using the dual wavelength means of proof, monitoring the movements of two kinds of resonant wavelengths, can to obtain simultaneously hydrogen dense
The variation of degree and temperature:
Density of hydrogen and temperature change can be respectively obtained by above formula.Therefore, an optical fiber hydrogen with temperature-compensating
Sensor is accomplished.It can be seen that photonic crystal fiber interferes to obtain the sensitivity point of density of hydrogen and temperature from the experimental result
Not -1.12nm/% and -0.078nm/ DEG C, similarly, the density of hydrogen and temperature sensitivity of fiber loop mirror be respectively -
0.07nm/% and -1.84nm/ DEG C.Currently, the lowest detection of spectrometer is limited to 1pm, density of hydrogen and temperature can theoretically be obtained
The lowest detection obtained respectively reaches 8.93ppm and 5.4 × 10-4℃.It is demonstrated experimentally that compared to other Optical Fider Hybrogen Sensors,
The density of hydrogen and temperature that the integral optical fiber sensing device designed in the present invention can measure simultaneously, and have relatively high sensitive
Degree.
Claims (3)
1. a kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring, which is characterized in that including light source part, pass light
Partially, transducing part, gas supply part and optical detector part, wherein light source part is wide spectrum light source, and passing light part includes single mode
Optical fiber, gas supply part are divided into the space of the density of hydrogen environment of setting, and optical detector part is spectroanalysis instrument, and transducing part includes
Optic fibre environment and photonic crystal fiber, wherein optic fibre environment includes three-dB coupler and high birefringence optical fiber；The transducing part
It is set to gas supply partial interior, the output end of wide spectrum light source and the input terminal of spectroanalysis instrument pass through single mode optical fiber and 3dB respectively
The connection of coupler one end, the both ends of high birefringence optical fiber pass through single mode optical fiber respectively and connect with three-dB coupler both ends；Spectrum analysis
One section of photonic crystal fiber is connected on the single mode optical fiber that instrument is connect with three-dB coupler, which coats hydrogen
Sensitive thin film, length are consistent with photonic crystal fiber length；Subsidence area is respectively set in photonic crystal fiber both ends.
2. a kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring according to claim 1, feature exist
In, it is different from the interference spectrum resonance wavelength position generated by optic fibre environment by photonic crystal fiber, to distinguish to hydrogen
The sensitive variation of gas concentration and temperature.
3. a kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring according to claim 1 or 2, feature
It is, the length of photonic crystal fiber is 19.5mm, and the both ends of photonic crystal fiber form 120 μm of subsidence area, make its generation
Resonance wavelength is the spectrum of 1551.5nm；The length of high birefringence optical fiber is 72mm, it is made to generate resonance wavelength 1595.39nm
Spectrum.
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| CN115452720A (en) * | 2022-09-06 | 2022-12-09 | 大连理工大学 | Hydrogen sensor based on photonic quasi-crystal fiber |
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