CN110018130A - A kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber - Google Patents
A kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber Download PDFInfo
- Publication number
- CN110018130A CN110018130A CN201910345668.2A CN201910345668A CN110018130A CN 110018130 A CN110018130 A CN 110018130A CN 201910345668 A CN201910345668 A CN 201910345668A CN 110018130 A CN110018130 A CN 110018130A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- micro optical
- gas
- segment
- triple
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 237
- 238000001514 detection method Methods 0.000 claims abstract description 50
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 62
- 239000000835 fiber Substances 0.000 claims description 40
- 230000007704 transition Effects 0.000 claims description 13
- 229910017000 As2Se3 Inorganic materials 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 18
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 148
- 230000003287 optical effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000004770 chalcogenides Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910000661 Mercury cadmium telluride Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- MCMSPRNYOJJPIZ-UHFFFAOYSA-N cadmium;mercury;tellurium Chemical compound [Cd]=[Te]=[Hg] MCMSPRNYOJJPIZ-UHFFFAOYSA-N 0.000 description 1
- 239000005387 chalcogenide glass Substances 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010429 evolutionary process Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 1
Classifications
-
- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention provides a kind of gas sensors generated based on triple-frequency harmonics in cascade micro optical fiber, including first segment micro optical fiber and second segment micro optical fiber, cascade between first segment micro optical fiber and second segment micro optical fiber；First segment micro optical fiber is arranged in Mr. Yu's gas chamber, first segment micro optical fiber both ends pass through the drilling agreed with and are pierced by certain described gas chamber, it is connect with certain described air chamber sealing, wherein the indoor gas of certain gas is target acquisition gas, absorbs the mid-infrared light inputted from first segment micro optical fiber input terminal using the indoor target acquisition gas of certain described gas；Second segment micro optical fiber is generated for triple-frequency harmonics, and remaining mid-infrared light is converted near infrared light；By the near infrared light power of near infrared detector detection output, the concentration of target acquisition gas is obtained by changed power.The beneficial effects of the present invention are: sensing arrangement is simple, there is shorter gas absorption length and higher detection of gas sensitivity, testing cost is low, and detection speed is fast, and detection accuracy is high, is conducive to integrated.
Description
Technical field
The present invention relates to field fibers and laser optoelectronic technical field, more particularly to one kind is based in cascade micro optical fiber three
The gas sensor that subharmonic generates.
Background technique
Gas sensing plays an important role in environment measuring and field of industry detection always.Due to gases many in atmosphere
(CO,CO2,NO,NO2,CH4Deng) in middle infrared spectrum (2.5-20 μm) there is strong absorption peak, so that mid-infrared light is passed in gas
Sense field is always by favor.Now major part remote sensing technology be all based on optical detection, using optical absorption measurement come pair
Determine the chemical composition of sample.Tunable diode laser absorption spectrometry technology, which has been demonstrated to sense real-time in-situ minimum gas, has height
The exploitation of sensitivity and good selectivity, commercial room temperature mid-infrared laser device also improves the sensitive of trace gas detection really
Degree.However, the laser signal usually detector made of mercury cadmium telluride or indium antimonide detects in mid infrared absorption spectrum, with
Silicon or GaAs are compared, and there are some disadvantages in near-infrared and visible wavelength region.For example, since band gap is smaller, in it is red
Serious limitation of the sensitivity of external detector by thermal noise, it is necessary to carry out cooling could obtain better performance, moreover, in it is red
External detector does not have cost-effectiveness yet.Compared with middle infrared detector, near infrared detector can easily overcome these disadvantages.
However, the gas absorbed efficiency of the wave-length coverage be far below in it is infrared, therefore also limit whole sensing capabilities.For example, close red
Infrared absorption coefficient is about 100 times low in outer methane adsorption coefficient ratio.
Gas sensing is converted on non-linear parameter and provides a kind of very promising scheme, not only can use mesh
Middle infrared signal can be converted near infrared signal and the height using near-infrared to the high-selenium corn of mid-infrared light by standard gas body
Performance detection.Therefore, the advantages of sufficiently obtaining middle infrared absorption and near infrared detection.The nonlinear effect converted on light
In, triple-frequency harmonics generation have many advantages, such as big wavelength interval, the power scaling of three rank indexes, flexible platform selecting, make its at
For the potential method of nonlinear gas sensing.
Optical fiber is the Effective medium that gas sensing and triple-frequency harmonics generate.However it is being greater than 3 μm of wave-length coverage, it is traditional
Silica-based optical fibers propagation loss is big.On the contrary, soft glass has excellent transmittance in middle infrared band.Especially chalcogenide glass
There is good transmission performance in 1-16 μm of broadband range, and have up to 10-17m2The nonlinear refractive index of/W, this has
Conducive to sensing and nonlinear optics.Micro optical fiber has excellent optical characteristics and mechanical characteristic as a kind of ultra-thin glass fiber, extensively
Applied to grating, active optical device, quantum and atom optics, nonlinear optics etc..Although micro optical fiber is to the bound of light field
It is very strong, but there is a big chunk light field to transmit in vacuum or gas medium covering in the form of evanscent field, and low-light
Fine evanscent field easily interacts with ambient enviroment, to reflect the situation of change of external environment.Therefore micro optical fiber exists
Highly sensitive optical sensing has huge application potential.Meanwhile micro optical fiber has high bent toughness, is able to bear the curved of very little
Bilge radius.And common micro optical fiber remains standard fiber as the second tail optical fiber, convenient for being connected with all kinds of fiber optic component and devices
It connects, is able to achieve lower insertion loss using the fiber optic connection technology of standard.In addition, the presence of transition region ensure that standard fiber
In light field mode be adiabatically converted to the light field mode in micro optical fiber, avoid mode mismatch caused by energy loss.By
Small in micro optical fiber quality, diameter is small, and micro optical fiber is used to sense, and is conducive to integrate.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of gas biographies generated based on triple-frequency harmonics in cascade micro optical fiber
Sensor, including the first conical fiber and the second conical fiber, the first conical fiber include the first tail optical fiber, First Transition area, first
Section micro optical fiber, the second transition region and the second tail optical fiber, the second conical fiber include the first tail optical fiber, First Transition area, second segment low-light
Fine, the second transition region and the second tail optical fiber；It is cascaded between first conical fiber and the second conical fiber, i.e. the second of the first conical fiber
First tail optical fiber of tail optical fiber and the second conical fiber is docking together；First segment micro optical fiber is arranged in Mr. Yu's gas chamber, first segment low-light
Fine both ends pass through the drilling agreed with and are pierced by certain described gas chamber, connect with certain described air chamber sealing, wherein the indoor gas of certain described gas
Body is target acquisition gas, is inputted using the indoor target acquisition gas absorption of certain described gas from first segment micro optical fiber input terminal
Mid-infrared light；Second segment micro optical fiber is generated for triple-frequency harmonics, and remaining mid-infrared light is converted near infrared light；
Mid-infrared light is inputted in the input terminal of first segment micro optical fiber, the big evanscent field generated using first segment micro optical fiber and institute
It states in certain gas chamber and interacts corresponding to the target acquisition gas of middle infrared absorption dactylogram, make the part in first segment micro optical fiber
Mid-infrared light is absorbed by target acquisition gas；Then remaining mid-infrared light is exported from the output end of first segment micro optical fiber；
Remaining mid-infrared light is output and then enter in second segment micro optical fiber from the output end of first segment micro optical fiber, is meeting three
Under the phase-matching condition that subharmonic generates, the mid-infrared light in second segment micro optical fiber is converted to positioned near infrared band three times
Harmonic wave, and exported in the output end of second segment micro optical fiber；Near infrared detector detects closely in the output end of second segment micro optical fiber
The power P of the triple-frequency harmonics of infrared band3=▽ P1, wherein ▽ is to generate relevant coupled mode equation to triple-frequency harmonics
The impact factor of decorrelation；
According to the output power and second segment of remaining mid-infrared light in the input power of mid-infrared light, first segment micro optical fiber
The power of the triple-frequency harmonics of the near infrared band of micro optical fiber output, and then according to red in being absorbed by the target acquisition gas
The absorption power of outer light obtains the concentration C of the target acquisition gas；
The calculation formula of surveyed target acquisition gas concentration C are as follows:Wherein, Δ P
The output power of second segment micro optical fiber and target acquisition when for target acquisition gas concentration detected by near infrared detector being 0
The difference power of the output power of second segment micro optical fiber, i.e. Δ P=P when gas concentration is C3(C=0)-P3(C=C).
Further, the material of the first conical fiber and the second conical fiber is As2Se3Glass；Second tail optical fiber diameter with
Standard fiber diameter is identical, and as 125 μm.
If the target acquisition gas being further filled in certain described gas chamber is different, corresponding on middle infrared absorption dactylogram
Different absorbing wavelength, then in the mid-infrared light of the input terminal input different wave length of first segment micro optical fiber.
Further, if the indoor target acquisition gas of certain gas is different, first segment micro optical fiber and second segment micro optical fiber
Length and diameter is also different, i.e. the difference of target acquisition gas, and the length and diameter of two sections of micro optical fibers can also correspond to change.
Further, after having selected near infrared detector, the length of first segment micro optical fiber is should be based in cascade micro optical fiber
The gas sensor that triple-frequency harmonics generates reaches corresponding length when minimum detection limit, and the length of second segment micro optical fiber is close red
Corresponding length when wave section triple-frequency harmonics output power maximum；The diameter of first segment micro optical fiber is produced by evanscent field and triple-frequency harmonics
Raw phase-matching condition codetermines, and under the phase-matching condition for avoiding triple-frequency harmonics generation, when evanscent field maximum is corresponding
Diameter is the diameter of first segment micro optical fiber；Meeting corresponding diameter when the phase-matching condition of triple-frequency harmonics generation is then second
The diameter of section micro optical fiber.
Further, when the target acquisition gas is methane gas, certain described gas chamber is then methane gas chamber；At this time first
The wavelength of the mid-infrared light of the corresponding input of section micro optical fiber input terminal is 3300nm；The near infrared light converted in second segment micro optical fiber
Wavelength is 1100nm.
Further, the minimum gas that the gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber can be detected
Concentration is determined by gas absorption length and near infrared detector performance；Wherein, the gas absorption length is first segment micro optical fiber
Length, for determining near infrared detector, the minimum based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates
The corresponding length of detection limit is optimal gas absorption length, and parameter, Δ P is related near infrared detector performance.
Technical solution provided by the invention has the benefit that sensing arrangement is simple, absorbs with shorter gas
Length and higher detection of gas sensitivity, testing cost is low, and detection speed is fast, and detection accuracy is high, is conducive to integrated.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of structure of the gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber in the embodiment of the present invention
Figure；
Fig. 2 is the relational graph of the effective refractive index and restriction factor of core diameter and light wave in the embodiment of the present invention；
Fig. 3 is mid-infrared light (3300nm) and triple-frequency harmonics (1100nm) in second segment micro optical fiber in the embodiment of the present invention
The schematic diagram of power evolutionary process；
Fig. 4 is the evolution that triple-frequency harmonics power increases in second segment micro optical fiber with propagation distance in the embodiment of the present invention
Journey；
Fig. 5 is detection limit and first segment micro optical fiber length L in the embodiment of the present invention1Relationship；
Fig. 6 is the normalized output power and sensitivity of first segment micro optical fiber and second segment micro optical fiber in the embodiment of the present invention
With the relationship of the concentration C of methane gas；
Fig. 7 is that methane gas when middle infrared sensing is identical as cascade micro optical fiber sensing sensitivity in the embodiment of the present invention is dense
Degree and gas absorber portion micro optical fiber length L1Relationship.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
It is closely red by output end the present invention provides a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber
Outer optical power target acquisition gas concentration in certain described gas chamber be 0 with it is non-zero when changed power reflect in certain described gas chamber
Target acquisition gas concentration.
For target acquisition gas different in certain described gas chamber, mid-infrared light wavelength difference is inputted, according to first segment
Micro optical fiber diameter determines by the phase-matching condition that the relevant restriction factor of evanscent field is generated with triple-frequency harmonics, second segment micro optical fiber
Diameter is determined by the phase-matching condition that triple-frequency harmonics generates, micro- based on cascading for the mid-infrared light of the different wave length of input
The diameter of two sections of micro optical fibers of the gas sensor that triple-frequency harmonics generates in optical fiber is different.The optimum length of second segment micro optical fiber is
Corresponding length when triple-frequency harmonics output power maximum；The optimum length of first segment micro optical fiber length is when near infrared detector is true
The corresponding length of minimum detection limit of the gas sensor generated after fixed based on triple-frequency harmonics in cascade micro optical fiber；Different mesh
Probe gas is marked, the optimum length of two sections of micro optical fibers is different.
Referring to FIG. 1, Fig. 1 is a kind of gas biography generated based on triple-frequency harmonics in cascade micro optical fiber in the embodiment of the present invention
The structure chart of sensor, comprising: the first conical fiber and the second conical fiber, the first conical fiber include the first tail optical fiber, the first mistake
Area, first segment micro optical fiber (GA sections), the second transition region and the second tail optical fiber are crossed, the second conical fiber includes the first tail optical fiber, the first mistake
Cross area, second segment micro optical fiber (THG sections), the second transition region and the second tail optical fiber；First conical fiber and the second conical fiber intercaste
Connection, i.e. the second tail optical fiber of the first conical fiber are docking together with the first tail optical fiber of the second conical fiber；The shape class of transition region
It is similar to taper, transition region connects the first tail optical fiber or the second tail optical fiber；Second tail optical fiber diameter is identical as standard fiber diameter, as
125μm.The material of first conical fiber and the second conical fiber is As2Se3Glass, As2Se3The nonlinear refractive index of glass
Coefficient is 2.4 × 10-17m2/W.First segment micro optical fiber is set in certain gas chamber containing target acquisition gas, first segment micro optical fiber
Both ends pass through the drilling agreed with and are pierced by certain described gas chamber, connect with certain described air chamber sealing, wherein the indoor gas of certain described gas
For target acquisition gas, absorbed from the input of first segment micro optical fiber input terminal using the indoor target acquisition gas of certain described gas
Infrared light (MIR)；Second segment micro optical fiber generates (THG) for triple-frequency harmonics, and remaining mid-infrared light is converted to near-infrared
Light；First segment micro optical fiber length is L1, second segment micro optical fiber length is L2；If the target acquisition gas being filled in certain described gas chamber
Difference corresponds to different absorbing wavelengths on middle infrared absorption dactylogram, then inputs in the input terminal of first segment micro optical fiber different
The mid-infrared light of wavelength.If the indoor target acquisition gas of certain gas is different, the length of first segment micro optical fiber and second segment micro optical fiber
Degree and diameter are also different, i.e., the difference of target acquisition gas, the length and diameter of two sections of micro optical fibers can also correspond to change.First segment
The diameter of micro optical fiber generates phase-matching condition by evanscent field and triple-frequency harmonics and codetermines, in the phase for avoiding triple-frequency harmonics generation
Under the matching condition of position, evanscent field is the bigger the better；The phase-matching condition that the diameter of second segment micro optical fiber is then generated by triple-frequency harmonics
It determines, the mid-infrared light or close because second segment micro optical fiber does not immerse in target acquisition gas, in second segment micro optical fiber
Infrared light will not be absorbed, i.e., evanscent field will not influence mid-infrared light or near infrared light in second segment micro optical fiber.So first
When the length of section micro optical fiber is that this reaches minimum detection limit based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates
Corresponding length, the length of second segment micro optical fiber corresponding length when being near infrared band triple-frequency harmonics output power maximum (
It is exactly after selected near infrared detector, the length of second segment micro optical fiber is that the output power of the detection of near infrared detector is maximum
When corresponding length)；The diameter of first segment micro optical fiber generates phase-matching condition by evanscent field and triple-frequency harmonics and codetermines,
Under the phase-matching condition for avoiding triple-frequency harmonics generation, when evanscent field maximum, corresponding diameter was the straight of first segment micro optical fiber
Diameter；Corresponding diameter is then the diameter of second segment micro optical fiber when meeting the phase-matching condition of triple-frequency harmonics generation.
The present embodiment is by taking methane gas as an example, i.e., certain gas chamber is methane gas chamber, and target acquisition gas is methane gas；Methane
Gas corresponding absorbing wavelength on middle infrared absorption dactylogram is 3300nm, absorption coefficient 1.6/cm, so first segment is micro-
The input mid-infrared light wavelength X of optical fiber1For 3300nm, the near-infrared wavelength λ of second segment micro optical fiber output end output3For
1100nm.When detecting the concentration of methane gas, the length L of first segment micro optical fiber1It is respectively 2.9cm and 750nm with core diameter；
Second segment micro optical fiber length L2It is respectively 9.5cm and 545nm with core diameter.
In the input terminal input wavelength λ of first segment micro optical fiber1For the mid-infrared light of 3300nm, passing through first segment micro optical fiber
Afterwards, part mid-infrared light is absorbed by methane gas；Then remaining mid-infrared light is after the output of the output end of first segment micro optical fiber
Into in second segment micro optical fiber；The output power P that remaining mid-infrared light is exported from the output end of first segment micro optical fiber1=P0exp
(-σCΓL1-αL1), wherein P0It is the input power of mid-infrared light, σ is the absorption coefficient of 100% methane gas, and C is first segment
The concentration of methane gas in micro optical fiber, α are attenuation coefficients, and Γ is restriction factor relevant to evanscent field, L1For first segment low-light
Fine length 2.9cm；In the case where meeting phase-matching condition, the mid-infrared light in second segment micro optical fiber is generated by triple-frequency harmonics,
Near infrared light is converted to, and is exported in the output end of second segment micro optical fiber；Output of the near infrared detector in second segment micro optical fiber
End detects the power P of the triple-frequency harmonics of near infrared band3=▽ P1, wherein ▽ is coupling relevant to triple-frequency harmonics generation
The impact factor of the decorrelation of Mode Equation.
According to the output power and near-infrared of remaining mid-infrared light in the input power of mid-infrared light, first segment micro optical fiber
The power of the triple-frequency harmonics of wave band, and then obtained according to the absorption power for the mid-infrared light being absorbed by the target acquisition gas
The concentration C of the target acquisition gas；
The calculation formula of visited target acquisition gas concentration C are as follows:Wherein, Δ P
The output power of second segment micro optical fiber and target acquisition when for target acquisition gas concentration detected by near infrared detector being 0
The difference power of the output power of second segment micro optical fiber, i.e. Δ P=P when gas concentration is C3(C=0)-P3(C=C).
The minimum gas concentration that gas sensor based on triple-frequency harmonics generation in cascade micro optical fiber can be detected is by gas
Body absorption length and near infrared detector performance determine；Wherein, the gas absorption length is the length of first segment micro optical fiber, right
In determining near infrared detector, the minimum detectable gas based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates
The corresponding length of concentration is optimal gas absorption length, and parameter, Δ P is related near infrared detector performance.Two sections of micro optical fibers it is straight
Diameter determines by restriction factor relevant to evanscent field and THG phase-matching condition jointly respectively, restriction factor and phase matched item
Part can ensure methane gas fully absorbing and efficient THG to mid-infrared light respectively.For THG, it is assumed that Self-phase modulation and
To the correction very little of propagation constant, the effective refractive index that phase-matching condition is equivalent to fundamental wave (FW) is equal to three times cross-phase
The effective refractive index of harmonic wave (THW).Fundamental wave in the present embodiment is mid-infrared light, and triple-frequency harmonics is near infrared light.
Referring to FIG. 2, Fig. 2 is the relationship of the effective refractive index and restriction factor of core diameter and wave in the embodiment of the present invention
Figure, Fig. 2 (a) give in As2Se3In micro optical fiber, FW (λ1=3300nm) basic mode HE11(ω) and THW (λ3=1100nm)
Dispersion relation between high-order mode, that is, FW (λ1=3300nm) basic mode HE11(ω) and THW (λ3=1100nm) high-order
The variation that the effective refractive index of mould changes with core diameter.For the phase-matching condition of FW and THW, ideally, it should
It is the phase matched between the basic mode of FW and the basic mode of THW.But due to the presence of material dispersion, this is difficult to realize.On the contrary,
A large amount of high-order mode can meet phase-matching condition.However, these high-order modes from FW there are different modes to be overlapped.The HE of THW12
(3 ω) mode provides optimal mode overlapping for triple-frequency harmonics generation, and corresponding fibre diameter is 545nm at this time, so second segment
The core diameter of micro optical fiber is set as 545nm.Different from second segment micro optical fiber, first segment micro optical fiber is needed at no non-linear turn
The process that methane gas absorbs mid-infrared light is carried out in the case where changing, therefore first segment micro optical fiber should be avoided and meet phase matched item
Part.But in order to which methane gas can efficiently absorb mid-infrared light in first segment micro optical fiber, need big evanscent field.Suddenly die
It is characterized by restriction factor, reflection is overlapping degree between gas and mode.For 3300nm wavelength mid-infrared light and
Speech, shown in the corresponding restriction factor such as Fig. 2 (b) of different core diameters, by Fig. 2 (b) it is found that with core diameter increase, limit
The factor processed is then gradually reduced；When core diameter is in 0.5-1 μ m, restriction factor sharply declines；When core diameter continues
When increase, restriction factor often be can be ignored, this is because light field by height limitation in the fibre core being gradually increased, suddenly die
Field is just small.In view of these factors, in order to enhance the interaction of mid-infrared light and methane gas, the fibre of first segment micro optical fiber
Core diameter is set as 750nm, and corresponding restriction factor is 0.733, can meet simultaneously generate big evanscent field and phase at this time
Unmatched condition.
For the gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber, the mid-infrared light quilt of 3300nm wavelength
It is input in chalcogenide optical fiber, is propagated then along first segment micro optical fiber.According to Beer-Lambert law, by formula (1)
Obtain output power P of the mid-infrared light after first segment micro optical fiber1:
P1=P0exp(-σCΓL1-αL1) (1)
Wherein P0It is that mid-infrared light inputs the input power into first segment micro optical fiber, (methane gas is to 3300nm wavelength by σ
The absorption coefficient of mid-infrared light is 1.6/cm) be 100% gas absorption coefficient, C is the concentration of methane gas for needing to detect,
α=αdB/ 4.343, α are attenuation coefficient, αdBIt is the loss of micro optical fiber, Γ is restriction factor relevant to evanscent field.
Triple-frequency harmonics generates THG and is modeled by coupled mode equation (2):
Wherein, A1And A3The amplitude of FW and THW are corresponded to respectively, and z is the propagation distance of light, α1=αdB/ 4.343, α3=
αdB/ 4.343 be the attenuation coefficient of FW and THW, δ β=β respectively3-3β1It is propagation constant mismatch, k1=ω1/ c=2 π/λ1It is FW
Aerial propagation constant, n2It is the nonlinear viscoelastic piles of fibrous material, i indicates imaginary part, and A* and J* are respectively A and J
Conjugation；JiIt is non-linear superposition integral, for basic mode HE11(ω) and mode HE12For (3 ω), J1=0.053 μm-2, J2=
0.073μm-2, J3=0.057 μm-2, J5=0.011 μm-2。
The output power of first segment micro optical fiber is the input power of second segment micro optical fiber.Therefore, in second segment micro optical fiber,
A1And A3Initial value be respectively P1 1/2With 0.When mid-infrared light is propagated in second segment micro optical fiber, the energy of FW is gradually converted
Into THW.From figure 3, it can be seen that the input of the mid-infrared light with 0.1W input power, the power of THW increases to maximum
Value, is then progressively decrease to 0.The output power of the maximum THW of generated 1.34 μ W can by efficient near infrared detector into
Row detection obtains.
Detection limit (LOD) is the measurable minimum of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber
Gas concentration (Cmin), by minimum detectable power (Pmin) determine.PminBy gas concentration be 0 when output power P (C=0) with
Output power P (C=C when gas concentration is Minimum detectable concentrationmin) difference indicate, as shown in formula (3):
Pmin≤ P (C=0)-P (C=Cmin) (3)
Wherein, PminSize determined by the performance of photodetector.
Assuming that the power resolution of mid-infrared light (MIR) detection is 1 × 10-9W, and the power of near infrared light (NIR) detection
Resolution ratio is 1 × 10-13W。
Another important parameter in the gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber is detection spirit
Sensitivity S, detectivity S are acquired by formula (4):
Wherein, C is the concentration of methane gas, and P is normalized power, i.e. P=P (C=C)/P (C=0), this provides Fig. 1
The comparativity of detectivity between middle MIR detection and NIR detection；It is that MIR is directly passed that MIR in the present embodiment, which is detected corresponding,
The output power of sensor detects, and it is based on the gas sensor that triple-frequency harmonics generates in cascade micro optical fiber that NIR, which is detected corresponding,
Output power detection.
Due to the triple-frequency harmonics (THW) of generation power very little (| A3|<<|A1|), the approximate solution of coupled mode equation (2)
It may be expressed as:
P3≈P1 3(k1n2|J3|)2z2 (5)
Wherein, P3It is the output power of triple-frequency harmonics (THW)；
It is calculated separately using formula (6) and formula (7) and is passed with the gas that should be generated based on triple-frequency harmonics in cascade micro optical fiber
MIR in sensor detects sensitivity relevant with the normalized power that NIR is detected:
SMIR=δ Γ L1exp(-δΓCL1) (6)
SNIR=3 δ Γ L1exp(-3δΓCL1) (7)
Concentration C and first segment micro optical fiber length L when target acquisition gas concentration is extremely low, for identical gas1And
Speech, NIR detection sensitivity be MIR detection 3 times, and NIR detection sensitivity and second segment micro optical fiber length L2It is unrelated,
The performance based on the gas sensor of triple-frequency harmonics generation in cascade micro optical fiber is analyzed, it is contemplated that chalcogenide optical fiber
Damage threshold, input power is fixed as 0.1W, the fibre loss α of 3300nm and 1100nm wavelengthdB=0.5dB/cm.
As shown in figure 4, different first segment micro optical fiber length L1, the output power of near infrared light is not in second segment micro optical fiber
Together；With first segment micro optical fiber length L1Increase, have more methane gas and absorb mid-infrared lights, in the biography of identical light
It broadcasts under distance z value, the output power decline of near infrared light.Different first segment micro optical fiber length L1Corresponding four curves have
Identical variation tendency, in second segment micro optical fiber length L2When=9.5cm, second segment micro optical fiber has maximum near infrared light defeated
Power out.Defining optimum length (Lopt) is the corresponding micro optical fiber length of minimum detection limit, is based in cascade micro optical fiber three times
When the concentration for the gas sensor detection methane gas that harmonic wave generates, the optimum length Lopt of second segment micro optical fiber is 9.5cm.
After the optimum length that second segment micro optical fiber has been determined, first segment micro optical fiber length L1What is do not existed together should be based on cascade
The detection limit (LOD) for the gas sensor that triple-frequency harmonics generates in micro optical fiber also needs to be determined.In order to straight with MIR
It connects sensing to be compared, calculates the minimum detection limit of MIR direct pick-up.As shown in figure 5, for MIR direct pick-up and base
The gas sensor that triple-frequency harmonics generates in cascade micro optical fiber, with first segment micro optical fiber length L1Increase, LOD be all first
Increase after reduction, this shows that there are best first segment micro optical fiber length L1.MIR direct pick-up and based on cascade micro optical fiber in three times
The minimum detection limit for the gas sensor that harmonic wave generates is respectively 2.7 × 10-9With 3.50 × 10-9.Correspondingly, straight for MIR
It is 8.7cm that the gas for connecing sensing, which absorbs the Lopt of part, and is used to pass based on the gas that triple-frequency harmonics generates in cascade micro optical fiber
The Lopt of the first segment micro optical fiber of sensor is 2.9cm, the based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates
One section of micro optical fiber length is that the gas of MIR direct pick-up absorbs the 1/3 of the micro optical fiber length of part.Therefore, MIR direct pick-up
Minimum LOD is slightly less than the LOD based on the gas sensor that triple-frequency harmonics generates in cascade micro optical fiber, but based in cascade micro optical fiber
The Lopt for the gas sensor that triple-frequency harmonics generates is less than the Lopt of MIR direct pick-up.
The gas sensor detection methane gas generated based on triple-frequency harmonics in cascade micro optical fiber in the present embodiment
When concentration, meeting optimum length L1=2.9cm and L2Under the conditions of=9.5cm, the sensitivity and normalizing of MIR detection and NIR detection
It is as shown in Figure 6 to change power.As the concentration C of methane gas increases, the normalized output power of MIR detection and NIR detection is gradually
Reduce, but the variation based on the output power of the gas sensing of triple-frequency harmonics generation in cascade low-light is more violent in low concentration,
Cause NIR detection that there is higher sensitivity, as shown in Fig. 6 (b), when the concentration of methane gas is less than 0.16, NIR detection has
Higher sensitivity.When C tends to 0, the sensitivity of NIR detection is 3 times of MIR detection, the result of this and formula (6) and formula (7)
It is identical.Therefore, what is proposed should be based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates more suitable for low concentration
Gas detection.
As shown in fig. 7, Fig. 7 is methane gas absorption length L1Corresponding critical concentration, critical concentration refer to when different
The concentration of methane gas when MIR detection is equal with the sensitivity that NIR is detected；Due to second segment micro optical fiber length L2For formula
(4) the normalized power sensitivity in does not influence, so second segment micro optical fiber length L2It is fixed on 9.5 centimetres.Work as first segment
Micro optical fiber length L1When increase, critical concentration reduces and tends to 0, it means that when the absorption length of methane gas is sufficiently large,
The advantage of the gas sensor based on triple-frequency harmonics generation in cascade micro optical fiber in terms of detection sensitivity fades away.So
And the length of micro optical fiber is limited by manufacturing technology.Therefore, gas sensing scheme proposed by the invention can reduce gas absorption
Length, that is, the length of first segment micro optical fiber.
The present invention is not limited only to methane gas sensing, is passed suitable for all gas positioned at middle infrared absorption dactylogram
Sense.
Technical solution provided by the invention has the benefit that sensing arrangement is simple, absorbs with shorter gas
Length and higher detection of gas sensitivity, testing cost is low, and detection speed is fast, and detection accuracy is high, is conducive to integrated.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber, it is characterised in that: including the first cone of light
Fine and the second conical fiber, the first conical fiber include the first tail optical fiber, First Transition area, first segment micro optical fiber, the second transition region
With the second tail optical fiber, the second conical fiber includes the first tail optical fiber, First Transition area, second segment micro optical fiber, the second transition region and second
Tail optical fiber；It is cascaded between first conical fiber and the second conical fiber, i.e. the second tail optical fiber and the second cone of light of the first conical fiber
The first fine tail optical fiber is docking together；First segment micro optical fiber is arranged in Mr. Yu's gas chamber, and first segment micro optical fiber both ends pass through and agree with
Drilling is pierced by certain described gas chamber, connect with certain described air chamber sealing, wherein the indoor gas of certain gas is target acquisition gas,
The mid-infrared light inputted from first segment micro optical fiber input terminal is absorbed using the indoor target acquisition gas of certain described gas；Second segment is micro-
Optical fiber is generated for triple-frequency harmonics, and remaining mid-infrared light is converted near infrared light；
First segment micro optical fiber input terminal input mid-infrared light, using first segment micro optical fiber generate big evanscent field and it is described certain
It interacts, makes red in the part in first segment micro optical fiber corresponding to the target acquisition gas of middle infrared absorption dactylogram in gas chamber
Outer light is absorbed by target acquisition gas；Then remaining mid-infrared light is exported from the output end of first segment micro optical fiber；
Remaining mid-infrared light is output and then enter in second segment micro optical fiber from the output end of first segment micro optical fiber, humorous three times meeting
Under the phase-matching condition that wave generates, the mid-infrared light in second segment micro optical fiber is converted to positioned at the humorous three times of near infrared band
Wave, and exported in the output end of second segment micro optical fiber；Near infrared detector detects close red in the output end of second segment micro optical fiber
The power of the triple-frequency harmonics of wave sectionWherein ▽ is the decorrelation that correlative coupling Mode Equation is generated with triple-frequency harmonics
Impact factor；
According to the power of the input power of mid-infrared light and the triple-frequency harmonics of the near infrared band of second segment micro optical fiber output, in turn
The concentration C of the target acquisition gas is obtained according to the absorption power for the mid-infrared light being absorbed by the target acquisition gas；
The calculation formula of surveyed target acquisition gas concentration C are as follows:Wherein, Δ P is close
The output power and target acquisition gas of second segment micro optical fiber when target acquisition gas concentration detected by infrared detector is 0
The difference power of the output power of second segment micro optical fiber, i.e. Δ P=P when concentration is C3(C=0)-P3(C=C).
2. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as described in claim 1, feature are existed
In: the material of the first conical fiber and the second conical fiber is As2Se3Glass；First tail optical fiber diameter and the second tail optical fiber diameter are equal
It is identical as standard fiber diameter, as 125 μm.
3. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as described in claim 1, feature are existed
In: if the target acquisition gas being filled in certain described gas chamber is different, different absorption waves is corresponded on middle infrared absorption dactylogram
It is long, then in the mid-infrared light of the input terminal input different wave length of first segment micro optical fiber.
4. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as described in claim 1, feature are existed
In: if the indoor target acquisition gas of certain gas is different, the length and diameter of first segment micro optical fiber and second segment micro optical fiber is not yet
Together, i.e. the difference of target acquisition gas, the length and diameter of two sections of micro optical fibers can also correspond to change.
5. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as claimed in claim 4, feature are existed
In: after having selected near infrared detector, the length of first segment micro optical fiber is that this is generated based on triple-frequency harmonics in cascade micro optical fiber
Gas sensor reaches corresponding length when minimum detection limit, and the length of second segment micro optical fiber is near infrared band triple-frequency harmonics
Corresponding length when output power maximum；The diameter of first segment micro optical fiber generates phase-matching condition by evanscent field and triple-frequency harmonics
It codetermines, under the phase-matching condition for avoiding triple-frequency harmonics generation, when evanscent field maximum, corresponding diameter was first segment
The diameter of micro optical fiber；Meeting corresponding diameter when the phase-matching condition of triple-frequency harmonics generation is then the straight of second segment micro optical fiber
Diameter.
6. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as described in claim 1, feature are existed
In: when the target acquisition gas is methane gas, certain described gas chamber is then methane gas chamber；First segment micro optical fiber input terminal at this time
The wavelength of the mid-infrared light of corresponding input is 3300nm；The wavelength for the near infrared light converted in second segment micro optical fiber is 1100nm.
7. a kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber as described in claim 1, feature are existed
In: the minimum gas concentration that can be detected based on the gas sensor that triple-frequency harmonics in cascade micro optical fiber generates is absorbed by gas
Length and near infrared detector performance determine；Wherein, the gas absorption length is the length of first segment micro optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910345668.2A CN110018130B (en) | 2019-04-26 | 2019-04-26 | Gas sensor based on third harmonic generation in cascade micro optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910345668.2A CN110018130B (en) | 2019-04-26 | 2019-04-26 | Gas sensor based on third harmonic generation in cascade micro optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110018130A true CN110018130A (en) | 2019-07-16 |
| CN110018130B CN110018130B (en) | 2020-09-04 |
Family
ID=67192592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910345668.2A Active CN110018130B (en) | 2019-04-26 | 2019-04-26 | Gas sensor based on third harmonic generation in cascade micro optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110018130B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426907A (en) * | 2019-08-02 | 2019-11-08 | 广东工业大学 | A kind of optical frequency conversion method, device and equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08204638A (en) * | 1995-01-26 | 1996-08-09 | Mitsubishi Electric Corp | Optical analog transmission system |
| CN103606813A (en) * | 2013-12-09 | 2014-02-26 | 天津理工大学 | Cascade triple frequency harmonic generating device |
| CN105319650A (en) * | 2015-12-09 | 2016-02-10 | 深圳市鼎硕同邦科技有限公司 | Full-optical-fiber type multi-wavelength etalon based on micro-nano optical fiber ring and manufacturing method of full-optical-fiber type multi-wavelength etalon |
| CN206162024U (en) * | 2016-10-25 | 2017-05-10 | 广东工业大学 | Accurate phase match basic mode third harmonic conversion equipment based on optic fibre |
| CN107589614A (en) * | 2017-10-12 | 2018-01-16 | 吉林大学 | A kind of method for improving triple-frequency harmonics generation efficiency in optical fiber |
| CN207516704U (en) * | 2017-08-31 | 2018-06-19 | 中国地质大学（武汉） | A kind of optical fiber structure for tunable wavelength conversion |
| CN207530301U (en) * | 2017-10-25 | 2018-06-22 | 中国地质大学（武汉） | Active Mode-locked Fiber Laser based on Group-velocity Matching photonic crystal fiber |
| CN108321670A (en) * | 2018-03-22 | 2018-07-24 | 华南理工大学 | A kind of micro-cavity laser of cascaded pump |
-
2019
- 2019-04-26 CN CN201910345668.2A patent/CN110018130B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08204638A (en) * | 1995-01-26 | 1996-08-09 | Mitsubishi Electric Corp | Optical analog transmission system |
| CN103606813A (en) * | 2013-12-09 | 2014-02-26 | 天津理工大学 | Cascade triple frequency harmonic generating device |
| CN105319650A (en) * | 2015-12-09 | 2016-02-10 | 深圳市鼎硕同邦科技有限公司 | Full-optical-fiber type multi-wavelength etalon based on micro-nano optical fiber ring and manufacturing method of full-optical-fiber type multi-wavelength etalon |
| CN206162024U (en) * | 2016-10-25 | 2017-05-10 | 广东工业大学 | Accurate phase match basic mode third harmonic conversion equipment based on optic fibre |
| CN207516704U (en) * | 2017-08-31 | 2018-06-19 | 中国地质大学（武汉） | A kind of optical fiber structure for tunable wavelength conversion |
| CN107589614A (en) * | 2017-10-12 | 2018-01-16 | 吉林大学 | A kind of method for improving triple-frequency harmonics generation efficiency in optical fiber |
| CN207530301U (en) * | 2017-10-25 | 2018-06-22 | 中国地质大学（武汉） | Active Mode-locked Fiber Laser based on Group-velocity Matching photonic crystal fiber |
| CN108321670A (en) * | 2018-03-22 | 2018-07-24 | 华南理工大学 | A kind of micro-cavity laser of cascaded pump |
Non-Patent Citations (3)
| Title |
|---|
| ALDO GUTIERREZ-ARROYOA ET AL: "《Theoretical study of an evanescent optical integrated sensor for multipurpose detection of gases and liquids in the Mid-Infrared》", 《SENSORS AND ACTUATORS B: CHEMICAL》 * |
| PAN HUANG ETAL: "《Nonlinear gas sensing based on third harmonic generation in cascaded chalcogenide microfibers》", 《JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS》 * |
| TIANYE HUANG ETAL: "《Photon–Plasmon Coupling for Fundamental-Mode Phase-Matched Third Harmonic and Triplet Photon Generation》", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426907A (en) * | 2019-08-02 | 2019-11-08 | 广东工业大学 | A kind of optical frequency conversion method, device and equipment |
| WO2021022879A1 (en) * | 2019-08-02 | 2021-02-11 | 广东工业大学 | Optical frequency conversion method, device and equipment |
| CN110426907B (en) * | 2019-08-02 | 2021-08-13 | 广东工业大学 | Optical frequency conversion method, device and equipment |
| GB2599856A (en) * | 2019-08-02 | 2022-04-13 | Univ Guangdong Technology | Optical frequency conversion method, device and equipment |
| GB2599856B (en) * | 2019-08-02 | 2023-12-06 | Univ Guangdong Technology | Optical frequency conversion method, apparatus, and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110018130B (en) | 2020-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102590112B (en) | Surface microstructure silicon cantilever enhancement type optical-thermal spectrum trace gas detection method and device | |
| CN105092531B (en) | The Mach-Zehnder interferometers optical biosensor aided in based on dicyclo resonant cavity | |
| CN107015309B (en) | A kind of low-loss broadband THz wave gradual change photon crystal filter | |
| CN108414448A (en) | One kind being based on the cascade optical sensor of dual resonant cavity | |
| CN107894394A (en) | A kind of optical sensor based on the straight-through end cascade of dicyclo resonant cavity | |
| Akowuah et al. | A novel compact photonic crystal fibre surface plasmon resonance biosensor for an aqueous environment | |
| Lv et al. | Double-formant surface plasmon resonance for refractive index sensing by anti-resonance fibers with high sensitivity and wide detection range | |
| CN208537382U (en) | One kind being based on the cascade optical sensor of dual resonant cavity | |
| CN110018130A (en) | A kind of gas sensor generated based on triple-frequency harmonics in cascade micro optical fiber | |
| CN109253986B (en) | Double-ring optical sensor of cascade Fourier transform spectrometer | |
| CN109507128A (en) | Strength investigation type gas sensor based on FP interferometer parallel-connection structure and photothermal technique | |
| CN109490233A (en) | The strength investigation type gas sensor of enhanced sensitivity and photothermal technique is cascaded based on FP interferometer | |
| US7684658B2 (en) | Optimized optical resonator device for sensing applications | |
| CN109507132A (en) | Spectrographic detection type gas sensor based on double optical fiber FP interferometer parallel-connection structures | |
| US11099060B2 (en) | Metal-insulator-metal high-sensitivity surface plasmon polariton terahertz wave detector | |
| CN109001155A (en) | A kind of humidity measuring method based on low gain low noise optical fiber cavity attenuation and vibration technique | |
| CN204964384U (en) | Mach - ceng deer interferometer optics biosensor based on dicyclo resonant cavity is supplementary | |
| CN105372206B (en) | Parallel remote optical fiber sensing system for the detection of multiple gases refractive index | |
| CN104180970B (en) | Protect polarisation wave guide ring shaped resonant cavity basic cell structure parameter polarization characteristic method of testing and device | |
| CN101413886B (en) | Apparatus for detecting liquid refractive index by plasma resonance optical fiber sensor | |
| CN104568839A (en) | Biosensor based on cascade connection of optical resonant cavity and reflective polarization converter | |
| CN111928880B (en) | Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof | |
| CN204330588U (en) | Based on the biology sensor of optical resonator and the cascade of reflective polarizing converter | |
| CN209117577U (en) | A kind of bicyclic optical sensor cascading Fourier transform spectrometer, | |
| CN110068533A (en) | A kind of sensor based on high Q optical microcavity evanscent field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |